Carburetion Troubleshooting Detail Reference Guide A Air Cleaner Manifold Problems involving the air cleaner manifold are normally related to loose mounting screws and/or damaged or leaking gaskets. Adjust the valve lash. Because of this there needs to be some clearance for the metal to expand. What's all the fuss about? Adjusting valve lash, or more correctly, lifter pre-load is quite simple on 90 degree V engines built before 302 change level 6; 10/21/68. I learned that having your valves too tight can cause a LOT of problems, and depending on how tight they are, it can even be catastrophic. You can pick up a caliper from Harbor Freight cheap and the feeler gauges from Snap-On for less then $5. Vehicle must be driven under light or heavy acceleration. Metal expands and contracts as it heats and cools. This information is: quality-assured and reliable, up-to-date, locally relevant and easy to understand. it's the opposite. The valve clearance specification is different for intake and exhaust valve. In addition to taking up valve lash, most lifters stay slightly collapsed at low engine rpm, slightly reducing the distance that the valve opens to enhance bottom-end torque and while encouraging a smoother idle. A tight valve is what you don't want. A indication you need to do sooner is if you notice more than usual black smoke on pull and if your fuel mileage drops. 312 Y-block valve lash problems Late V8 (1954+) I have to agree with the others on this one. My new CRF150RB seems to be a bit sluggish of idle. The E-Ton service manual for my Beamer R4 150 lists a recommended valve lash setting of 0. If your valve lash is too tight it can cause you to wear down the cam resulting in a costly repair (not to mention lots of metal shavings circulating through your engine). What are the symptoms of needing valve adjustment. This is the first time I've checked the valves on anything but a thumper with screw adjusters, so I want to make sure I'm doing this right. i am working on a 05 odyssey that has valve train noise. The intakes aren't as critical, and you can run. But them less chances of it to be damaged. The symptoms of tight valves are a very quiet engine, and stalling at idle after a hot, fast run. Diagnosis and Treatment of a Sticky Valve Valve sticking is a very common problem in small aircraft engines and although we have a number of things we can do to prevent this, it still happens. Now that Kstateskier told you how to get at the valve covers, checking the valve lash is the same procedure as the 550/660/700. TDC is the point where a piston is exactly at the top of stroke, and the crankshaft connecting rod journal is exactly straight up (in a vertical engine of course). Tight Valves - Symptoms? I've been reading as much as I can about valve seating, tight lash/loose lash, negative preload. Now pull the valve cover slowly up and work the cover over the cam timing gears. I installed a set of stage 2 Hot Cams on my XP1000 and when I checked the valve lash some were a little tight and some were on the lower end of the specs. Finding the sweet spot, being consistent, and following a routine are keys in setting valve lash like a pro. Valve Adjustment Discussion. But tight valve clearances (what I think you're really asking about) do cause low compression). What's all the fuss about? Adjusting valve lash, or more correctly, lifter pre-load is quite simple on 90 degree V engines built before 302 change level 6; 10/21/68. Lots of reports of 3RZs with 120+k and tight exhaust valves. The gasket functions as a seal that prevents the combustion process from leaking into the coolant passages. Torque specifications for Briggs & Stratton engines can be found the current model's product page on the company website. if any thing i don't like about doing it is pulling the passenger seat out,so i can see what i'm doing. Adjusting the Valves on a 24-Valve Cummins - Lashed Out If the valve lash is too. This is hard on the valvetrain, makes a lot of noise, and mushrooms out the valve tips. 011 inch Exhaust valves, cold 0. Glaucoma patients and contact lenses - How to fit - How to treat? (not to tight, not The aim of this study is to analyze the relationship between the self-reported symptoms and objective. Tightened it back up, and still had same issue. The exhaust valve adjustment gets tighter because the valve and seats wear down due to the hot exhaust. We were lucky with both of these jobs that there was no valve damage as a result of the tight lash. Too loose is not good and too tight is even worse. A service of the National Library of Medicine, National Institutes of Health. A very tight 0. It is beneficial to use "positive-lock" style rocker arm retention fasteners instead of the basic pinched rocker nuts or Nylox. 013-inch of valve clearance on exhaust valve 1 and a shim thickness of 0. This condition also causes vibration. Torque measurements should be checked with an inch pound torque wrench before any adjustments are made. Best Answer: Loose valves don't actually cause any major problems or damage. A looser lash setting increases the low-end power of the engine where a tighter lash increases top-end power. Too loose is not good and too tight is even worse. These engines have a 3/8" stud with a self locking style nut and one piece valve spring retainers. Valve Lash Setting-Do You Need To Worry About It Valve lash setting is something most drivers don't even think about. I have an '03, I run it pretty hard with riding and racing but always change fluids and take care of it. The gasket functions as a seal that prevents the combustion process from leaking into the coolant passages. Niccol FADE IN A white title appears on a black screen. Valve (Cam) timing can be quite complex or quite simple. it will be worse when i put in R and worse when i turn on the air con. It is beneficial to use "positive-lock" style rocker arm retention fasteners instead of the basic pinched rocker nuts or Nylox. After pulling the codes it seems this is a common DTC to cars of this era. Adjust the intake valve to ZERO LASH with no pre-load, then tighten 1/2 more turn. Too tight and the bike may be hard to start. ) 800 RPM 19 inches HG & steady, is normal. In most cases you will not have to worry about it. "Valve lash is the mechanical clearance in the valvetrain from the valve tip to the rocker in a pushrod engine using solid lifters. valves! Clearance: To allow the valve to fully seat and transfer the heat it accumulated when open, and to allow for heat expansion when hot, the camshafts lifting pattern and valve train are designed to operate with clearance lash or gap between the valve train and the valve. I know the obvious. The first adjustment is the input shaft / worm gear thrust bearing preload. My 05 wolverine was idling good but running terrible at all speeds above idle. After awhile, the valve lash/clearance begins to widen and the first thing that goes wrong is the compression release doesn't work properly causing the engine to drag which may sound to some as a dead or dying battery. Old thread but here is info on adjusting valves on 2009 Pilot with valve deactivation system. the EXHAUST valve just starts to OPEN, and set the intake for that cylinder. Cam is really what GM should have put in that engine from the factory although they shouldn’t have been so cheap and put roller cam in. Vehicle must be driven under light or heavy acceleration. I have asked this question before, on a BBC is there any problems (valve train damage) i would be facing by reducing the valve lash on a solid roller, cam card called for. Interesting. The looser you set the valve lash the more bottom end is boosted and the more valve train noise you get. On most shim engines that entails 10-20 bolts, a real fragile gasket that is easy to break and a big H shaped cover. Model T Ford Forum: Forum 2016 Started January 1, 2016. POSSIBLE STEERING PROBLEMS AND CAUSES ROAD WANDER - Tire pressure incorrect or unequal left to right. a kind of lung cancer called non–small cell lung cancer (NSCLC). The engine will have to be rotated through a complete cycle so that all of the rockers are installed while the cam is on the base circle. Measure the intake valves clearance by sliding the feeler gauge down between the cam lobes and valve lifter. This (tight valves) effects performance but what is worse is the valve sheds heat when it hits the valve seat. It's better to check them at the specified intervals than to guess all is well. 004 inches of clearance. The angle on the "ball" ends of the top pushrod were made on the drill press with a file. Y-Block assembly errors. That's the biggest beginners mistake, setting it just a tiny bit loose so that it's noisier after they are done!. I realize the motor wants more cam,but am i tearing something up by doing this? No visable signs,just wondering. i am working on a 05 odyssey that has valve train noise. The '95 - '98 multi valve factory turbo diesel motor (1HD-FT) is a great motor with gobs of go and gobs of torque. When valves are said to be set 'tight' it means (at least to me anyway) that the lash still exists, but is set at a reduced clearance. i replaced them and re-seated them. If either of these conditions exists you then must physically check the valve lash with a feeler gauge. By Mark Zimmerman. Lots of reports of 3RZs with 120+k and tight exhaust valves. My experience between adjustments is that they can go either way. Let the initial fall wher. That's the biggest beginners mistake, setting it just a tiny bit loose so that it's noisier after they are done!. Either check your owner’s manual or call your dealer about valve lash setting. If it is too little, the valves may not seat properly. When this happens the valve sits deeper into the seat which raises its stem toward the rocker--so tighter clearance. Do not continue operating this machine if it is damaged. I realize the motor wants more cam,but am i tearing something up by doing this? No visable signs,just wondering. Niccol FADE IN A white title appears on a black screen. nz 4G9 ENGINE (E-W) -General Information 11A-0-3 EMitsubishi Motors Corporation July 1997 PWEE9502-C Revised GENERAL INFORMATION 4G92 Descriptions 4G92-SOHC 4G92-DOHC-MIVEC. If you have the "T" mark aligned with the index mark and you are on the COMPRESSION stroke, the intake and exhaust valves should be fully CLOSED, providing a "space" between the valve tappet adjusting screw and the valve stem on both valves. Finding the sweet spot, being consistent, and following a routine are keys in setting valve lash like a pro. Say you recorded 0. I turned the engine over by hand a few times again & rechecked the valve clearances. If I remember right, the owner's manual for my 2004 Accord says to adjust the valves at 120k. Did you by any chance bypass the fuse or use a higher Amp fuse? It sounds like you're pulling so much juice through the starter motor you're in danger of catching fire. The first time I was worried but it worked out fine. Valves don't just suddenly wear however so unless the rattling has gone from a rustling, to a ticking, to a rattling over a few thousand miles then I'd suspect it's not the valve clearances. When this happens the valve sits deeper into the seat which raises its stem toward the rocker--so tighter clearance. The head gasket is found between the engine block and the cylinder head or heads in a V-type engine. What causes the lifters in the engine to make this sound? That has. Seat pan. 004 or very tight 0. Loosen locknut(s) and turn adjuster screw(s) until there is a slight drag on feeler gauge(s). Valve Lash Setting-Do You Need To Worry About It Valve lash setting is something most drivers don't even think about. If you set the valves too loose, the rockers will tick (due to the clearance between the rockers and the valve). This is why frequent readjustments are needed when using solid lifters. Welcome to my list of links and other information for the Honda Pacific Coast PC800 motorcycle. I checked the flex plate bolts and they are tight and the flexplate looks just fine. I use aluminum heads on this engine. Heres my findings during the valve adjusting process. Valve recession can cause the same kind of problem. Has done so since the odo read 45K miles. At 12K I changed all four exhaust valves. Most symptoms related to mitral valve collapse are benign. It is much safer to run loose than tight. If you have all the valves adjusted too tight idle quality and low end performance may suffer slightly with an attendant small gain in top end horsepower. After pulling the codes it seems this is a common DTC to cars of this era. The lifter needs to be on the base of the lobe when setting valve lash. It's a little annoying, but the links are full of good info so I tend to overlook the annoyingness. The cars I've serviced have been mostly European and Asian and the majority of those cars that required lash inspections (screw or shim) adjustment needed it. If you find an engine that has bent valve symptoms, and no recent belt failure is reported or evident, consider carbon buildup on the valves and stems as a cause for the wide lash and. So sit tight, and wait for my feedback. The wet test will increase compression on a ring problem, but not a valve. When I pulled the valve covers off I noticed that the valves were very tight. Too little spark advance will cause low power, bad gas mileage, backfiring, and poor performance. Refer to "The engine will not start. I have had a couple weird misfire issues in the past from a cam lobe starting to go down. The valve lash is not correct. Setting hot lash was an art form reserved for the more hardcore race crowd. earlier this week i adjusted alan, scorpio6, valves. 0 race motor a couple of times at a previous race meet on downshifts getting used to the 901 box. To verify that it is aligned for cylinder #1 you can remove your bank 1 valve cover and make sure both the intake and exhaust valves are closed, if they are not, the marks are aligned for cylinder #6, rotate the engine another 360 degrees and re-align the marks, the valves should be closed now and cylinder #1 is at TDC on the compression stroke. Digital METRIC caliper. 7 Nm torque is very little, only about a quarter screw turn more than from finger tight. Set of METRIC feeler gauges. A tight valve setting means that the valve cannot seat properly. The result is that there is enough rocker end binding, for the valve lifting rocker-arms rotation to hold the valve open, almost defeating a tired old valve spring. And a valve lash adjustment needs to be done right or you could be looking at all sorts of headaches so I like what this guy did because he was meticulous to make sure it was done right and that is important because better done right to begin with than to have to do it over. My driveline was tight also but there was no grease in the rear u joint and it was rusty inside, you can't always go by feel it's whats inside that matters. Many owners find themselves fretting over engine sounds that clatter, tick, and rattle, but experience no ride-ability issues or loss of performance. Setting Valve Lash on Hydraulic Lifters - Speedway Motors. An engine that makes excessive noise when it runs may have a loose valve. Recirculating ball steering is still used in many trucks, but has a more com-plicated steering linkage than rack & pinion steering requires. everything seems to be fine with my engine. London: Remedica; 2004. i have ran the injectors this way lots of times and like i said i recheck for zero lash two cycles away. The procedure for adjusting the valves varies between models, but the basic steps are the same for all Briggs & Stratton engines. I learned that having your valves too tight can cause a LOT of problems, and depending on how tight they are, it can even be catastrophic. Re: Did my first 1290 valve adjustment by jonnyrotton » Wed Dec 03, 2014 10:02 am Guy, that's what I was hoping that it wouldn't run or run well at all, that way I won't have to pull everything off again just to see if the bolt hole lines up and the cam marks are aligned. Valve lifter OD measurement December 27 Scuffed pistons and tight wrist pins November 28. So sit tight, and wait for my feedback. Well all of the exhaust valves are too tight and all of my intake valves are within spec, one is close to the low end but ok. Valve sealing is important and shouldn't be assumed. Changing the valve lash is a good way to get an indication of which way to go for your next cam change. Valves are the doors to your intake and exhaust system. It should. You will have to take your desired measurement (we will use 0. In most cases you will not have to worry about it. i bought the car with a jumped timing belt. No matter what type of ramp the cam has, it's not going to be harder on the valvetrain with less lash. If it were leaking through th intake it would be popping through the intake. Now that you have established zero lash you can set the lifter preload. You might also find the help you need by checking the common symptoms and solutions for riding mowers and tractors. I am not a professional, but I'm fairly sure they are not too tight. it's the opposite. As for valves: I'm not actually sure of the symptoms, but I would check 'em anyway (if you know how), especially if you think they are out of whack, to make sure they are to specs. Torque specifications for Briggs & Stratton engines can be found the current model's product page on the company website. The correct setting is had when there is slight resistance when moving the feeler gauge. The looser you set the valve lash the more bottom end is boosted and the more valve train noise you get. Patient Forums for Finger and Hand Problems. Look at the valves as you approch the (A) mark the valves on the right cyl. What causes the lifters in the engine to make this sound? That has. Valve lash DIY I am not responsible for any damage you cause to the engine or yourself during this procedure. getting fuel and spark, compression shows 90. Small Engine Specs Specifications for small engines used on a variety of outdoor power equipment. Make sure they are right before you assume something else needs fixing. So here you had a near new car that had to have 2 new cylinder heads. Due to problems I have been having with misfire and knock, I am trying to verify if some readjustments are in order. on very aggressive setups you may have piston to valve contact with a very tight valve lash. Valve lash is a clearance in the drivetrain designed to compensate for thermal expansion of valvetrain components as the engine heats up. 004" and the intake valves were tight with no gap causing pressure on the valve it's self. Has done so since the odo read 45K miles. Too little lash and you'll see starting problems and reliability issues. the only thing that bothers me is that i have a bit of vibration when in N or P. If they get too tight they won't "seat" on the seats anymore but rather the lifter will continue riding around the backside of the cam lobe. That's why all my engines get a preliminary static adjustment, and a final, running adjustment with everything heated up and pressurized. I advise setting the valves to. Two major issues to deal with first is valve adjustment and second is the carb , to start with check the vavle lash if i remember correctly its 3-5 thousanths or. pulled the valve covers and everything off, yes, they were on there waaay too damn tight. Setting the clearances too tight can prevent valves from completely closing (or not closing for enough time), which may cause extreme heat damage and complete valve failure. The looser you set the valve lash the more bottom end is boosted and the more valve train noise you get. it bent two valves in #4 cylinder and two valves in #1 cylinder. Perfectly quiet with zero clearance on the exhaust valves (Yamaha, not Toyota). The symptoms the car is exhibiting could only be caused by additional air being admitted into the intake manifold. There will be a different valve lash clearance range for the intake and the exhaust valves. In most cases you will not have to worry about it. Tightened it back up, and still had same issue. re: EZGO 295 - 350 engine Valve Adjustment The adjustment should be made when the engine is cold. Although vertebral artery dissection is one of the most common causes of stroke in young adults, it may produce no noticeable symptoms at first. Any sort of engine oil leak is bad for the engine, as the oil is what protects the metal internal components of the engine from friction. There is no reason to run a tight valve at all. In disassembling Y-Block core engines I have noted a number of common mistakes that are made during the assembly of Y-Blocks during rebuild. Looser valve lash does the opposite and results in a noisier valve train. How To Adjust Your Valves? Valve clearances: Intake=0. It is concerned with such matters as choice of exchanger, specification of duty,. Driving with the valves too tight causes more damage. Too loose and the valvetrain starts getting beat up, tighter is easier on parts. After I get it started it usually starts first or second kick after I have taken a break from riding (20-30 minutes). One thing I don't know is whether or not (for the Element) valves get loose over time or tight over time. Seals are colour coded for inlet & exhaust. I took valve cover off, and the end cap in spring of exhaust valve was sitting in cover and lock nut had back out. A loose valve just has a tiny bit of slack between the cam and rocker arm (or what ever they call them on a Honda). Be sure the valve stem fits securely into the cam follower guides. Another possibility is that the valve timing is off one tooth. If the air filter is not working well, dirt will slip by and "Sand Blast" the coating off the valves. Setting Hydraulic Lifter Pre-load: The correct amount of lifter pre-load is important to help efficiently control the valve train. One other word on valve lash. Also, if you have VTEC (d16y8. Follow the Maintenance Schedule recommendations to ensure that the all-terrain vehicle (ATV)(Quad) is in peak operating condition and the emission levels are within the standards set by the your states/county Resources Board. I do have High Performance Poly Rocker Assemblies if yours are worn; the HP units have hard chromed shafts/fully bushed rockers/improved jam-nut adjusters to retain valve lash adjustment or maintain Hydraulic Cam pre-loads when using the HP Hyd. theres a reason car companies started using timing belts. Everything is now adjusted to. Motorcycle Valve Adjustment Simplified. A loose cam housing could adversly affect last but it would affect othe things as well. Sounds like you might have some tight valves. Volume 1 describes how to adjust solid lifter tappets. For previous model years, product repair manuals for all models, including older and antique models, of Briggs & Stratton engines can be purchased and downloaded from the website. Here's a run down of the symptoms and what I've done to try to remedy them to no avail. Ford 260, 289 and 302 Firing Order Here is a large firing order for the old school Ford 260, 289 and 302. As it warms up the lash increases, don't ask me how, but it does. (bad valves sticking. Before trying to repair your valves, look them over carefully. I use aluminum heads on this engine. The result is that there is enough rocker end binding, for the valve lifting rocker-arms rotation to hold the valve open, almost defeating a tired old valve spring. 002" is enough to make a difference when you are adjusting valves. This allows the action pin to move rearward, which increases the fuel delivery rate. Set the intake lash at. Some symptoms of misadjusted valves are: pour gas mileage, lack of power or excessive emissions, among others. The hydraulic lifter in a car's engine uses oil pressure to adjust a plunger and take up all the clearance in the valve train. Loosen locknut(s) and turn adjuster screw(s) until there is a slight drag on feeler gauge(s). FYI it was my exhaust valve that was too tight. Silverstein1 1Medicine/blood Research Institute, Medical College of Wisconsin, United States of America 2Pediatrics, Obstetrics and Gynecology, Medical College of Wisconsin, United States of America Underline denotes presenting author. Tight Valves - Symptoms? I've been reading as much as I can about valve seating, tight lash/loose lash, negative preload. If the seal created by the valve cover and valve cover gasket loses its ability to contain all the oil flying around inside then oil will escape. If the valves are too tight they can hang open and burn causing a loss of compression never heard about the head gasket failing. On an OHC engine this is not a problem. Well, I just read through the linked post. It was written by Stett, an MMI graduate and premier motor builder for Truett & Osborne. Hi all, an experienced mechanic told me that it would be meaningful to set the same tappet clearance at a 650 as recommended for the 750. The primary drive chain connects the crankshaft with both large intake camshaft sprockets, the balance shaft sprockets and the intermediate shaft sprocket. If you didn't have blue smoke before the valve adjustment and you think you did a sloppy job one the adjusment. I had the lash down to your numbers and it ran fine - and the only reason I did it was to kill some overlap so it would pass the CA smog test (it did!). Next things I'd want to check are fuel flow to the carb, i. 1 Are all ladders maintained in good condition, joints between steps and side rails tight, all hardware and fittings securely attached, and moveable parts operating freely without binding or undue play?. You need to be a good listener. Now pull the valve cover slowly up and work the cover over the cam timing gears. Less valve lash clearance ('tight') results in hotter running valves, as their heat transfer is reduced from lessened valve seat contact duration. ) 800 RPM 19 inches HG & steady, is normal. Okay, well I have this 30 valve 2. I would think if Georg adjusted them, they were probably correct. The fact that none of the intake valves leaked led me to a conclusion that exhaust valves take more heat so they are more likely to need readjustment. Symptoms of an overactive bladder include urinating eight or more times a day as well as two or more times at night, a sudden and strong need for immediate urinating and urine leakage following a sudden and strong urge to urinate. It is supposed to limit vacuum from the turbo, so oil does not get sucked out. Valve adjustment is easy to do. It is possible that the valve's messed up in the booster. Something like a valve job, I recommend using a dealer, that way it's done right, and to specs. com Valve lash is defined as the mechanical clearance between the tip of the rocker arm and the valve stem tip. ログイン; meddic. I did check the lash hot and left them set slightly looser at. Here's where turning the rocker shaft comes to play and you make all 3 rockers when in detent position to have enough clearance for the rollers not to ride on the camshaft lobes. it bent two valves in #4 cylinder and two valves in #1 cylinder. Without this clearance, the spring would not be able to close the valve, hot gas would leak out and the valves would burn. I agree that it might be carb related. The carburetor contains many small jets, typically made of brass that also will need to be cleaned thoroughly. Too loose and the valve opens late, too tight, the valve opens early. 270 Likes, 1 Comments - UW Medicine (@uwmedicine) on Instagram: “Thank you to all the women in STEM who make the world a healthier, smarter and more equitable…”. If this is the case, adjust theclearance of the two maladjusted or worn valves using the adjusting screw on the rocker arm. i need to adjust the valves on a 2002 club car kawasaki gas engine valve adjustment specs - Motorcycles question What are the valve lash specs for 2007 Honda. Sometimes insignificant orNo one benefits when a failed component goes on the junk unrelated symptoms can point to the cause of the failure. Initiaal valve lash clearancee adjustment, subsequ uent adjusttments to b be perform med at 77,0 000 Km [48,0 000 mile] orr every 4th o oil change fo or automotive enginess and, 2000 hour, 2. Provided Cylinder #1 valve lash is correct or greater, only then will you have play (lash) at TDC compression. After I get it started it usually starts first or second kick after I have taken a break from riding (20-30 minutes). Variable valve timing is the modifying of the engine valve opening/closing timing dynamically. How To "INSPECT" Your Valve Clearances. The cam card says its needs to be lashed at 018-020 thous hot. A very loose valve may indicate an excessively worn rocker arm, bent pushrod, mushroomed valve stem or the like. "A tight-lash camshaft may permit the valve to initially accelerate and decelerate more quickly without being overly harsh, but may not be of practical use in situations where engine growth from cold to hot will require resetting the lash frequently," says Knight, noting that engine materials play a critical role in such camshaft decisions. Many times, this problem will be traced back to tight valve lash. from a fucked up intake valve in cyl #6. My experience between adjustments is that they can go either way. Changes to the intake closing in particular will affect manifold vacuum. if you feel like it. Apply a small amount of engine assembly lube to the pushrod tip. HINT: If valve lash is adjustable, valve burning can be prevented by adjusting the valve lash regularly. 002" when the engine likes. I never once found the 350 or 400 valves out of spec on mine. Only stock Briggs & Stratton Animal # 124332-8201engine will be allowed in this class. they are specifically written for the do-it-yourself-er as well as the experienced mechanic. My experience between adjustments is that they can go either way. Adjust the valve lash. I did check the lash hot and left them set slightly looser at. The combustion pressure will quickly etch a notch in the valve head or seat, or the valve will simply fail (break off and mess up other parts) due to overheating. Valve Overlap- the time when both valves are open as the piston travels in the bore. Lash set wrong. With exhaust valves, the clearance can become tighter over time as the valves or valve seats wear down, diminishing the clearance, known as the lash, between the valves and the valve train components. Re: Did my first 1290 valve adjustment by jonnyrotton » Wed Dec 03, 2014 10:02 am Guy, that's what I was hoping that it wouldn't run or run well at all, that way I won't have to pull everything off again just to see if the bolt hole lines up and the cam marks are aligned. Valve Lash Setting-Do You Need To Worry About It Valve lash setting is something most drivers don't even think about. The mechanical valve adjusters never change settings. Best Answer: Loose valves don't actually cause any major problems or damage. i would recheck valve lash, may have a tight intake valve, double check timing. removed valve covers and did not find any problems. When valves are said to be set 'tight' it means (at least to me anyway) that the lash still exists, but is set at a reduced clearance. BMW’s variable valve timing implements a time shift (phase shift) scheme. But it's not uncommon to find valve clearances both tighter and looser than spec and the engine will usually run quieter after an adjustment. If you have no lash you take a chance of burning the valves. Symptoms may be ignored until it is too late or mistakenly attributed to a far less serious condition. Very rapid valve recession is to be expected when run that way. This may be so but the ramps open the valves relatively slowly and during that period the flow, into and out of the cylinder, is little more than a nuisance leak and this almost always manifests itself as a reduction in torque throughout the rpm range. I've had to pull out pistons to free struck rings and I'll tell you this. By Mark Zimmerman. This is the clearance between the camshaft and the valve stem. The purpose of this chapter of the Administrative Code is to provide safety for life, limb and health of employees engaged in construction activity. Excessive lash will cause noise in the engine and wear in the valvetrain, while lashing the valve too tightly will cause the valve to hang open and the cylinder won't run. Once you have determined zero lash tighten the rocker arm adjuster bolt 1/2 turn, this is the preload we use, check with your cam and or lifter manufacturer to confirm preload settings.