DOCSHULTZ Posted September 30, 2011 Report Share Posted September 30, 2011 Just thought i'd get some insight from other users on how they do their valve adjustments on the L20b because ive been reading up on it and it seems there are several different methods of doing it. the folowing is what iv'e read so far on different web pages and such. 1. the way it states in the factory service manual it to bring the no.1 cylinder to TDC and adjust some of the valves then bring the no. 4 cylinder to TDC and adjust the remaining. 2. i read where a guy says the he puts the cam lobes in the 10 and 2 o'clock position the adjusts the valves for that cylinder then goes to the next one and does the same. 3. another guy states that the cam lobes should be straight up in the 12 o'clock position. then sdjust them. And on other old cars iv'e always brought every cylinder to TDC first. But they wer'nt overhead cam motors. So i'm a little bit confused i did it the way the factory service manual said but didnt have much luck. I'm thinking it could be that i may have adjusted them a bit to tight but i'm not sure i warmed up the engine before i started but it took me a minute being i haven't adjusted valves on an overhead cam before. But i'm getting a little hesitation on the throtle and a little bit of a missing type result. which i didnt have before i started. and need them adjusted because one of the rockers fell off from i believe was from slop from not being adjusted before maybe ever. any comments or insight would greatly appreiciated. Quote Link to comment
thisismatt Posted September 30, 2011 Report Share Posted September 30, 2011 If your valves are adjusted too tight then said valves won't seat (close) all the way, leading to lousy compression and eventually burnt valves, compounding the problem, so too tight could be causing those cylinders to miss from lack of compression. I would point each lobe straight up so I'm always setting them in the exact same spot. Quote Link to comment
banzai510(hainz) Posted September 30, 2011 Report Share Posted September 30, 2011 long as the back side of the lobe is off the rocker then its good. 10 to 2 o cloclk should be fine but I just say 12 to make it MORON proff. Me as a rule of thumb. i point lobe up and if I wiggle rocker then I know the valve is closing. If noisy then tighten it up. if hard to start or lossing power ck to see if too tight. Usually the exhaust will get tight as the valve seat sinks. adjust your carb mixture and timming Quote Link to comment
DOCSHULTZ Posted September 30, 2011 Author Report Share Posted September 30, 2011 If your valves are adjusted too tight then said valves won't seat (close) all the way, leading to lousy compression and eventually burnt valves, compounding the problem, so too tight could be causing those cylinders to miss from lack of compression. I would point each lobe straight up so I'm always setting them in the exact same spot. ok thanks for the info will readjust tomarrow. thanks again Quote Link to comment
DOCSHULTZ Posted September 30, 2011 Author Report Share Posted September 30, 2011 long as the back side of the lobe is off the rocker then its good. 10 to 2 o cloclk should be fine but I just say 12 to make it MORON proff. Me as a rule of thumb. i point lobe up and if I wiggle rocker then I know the valve is closing. If noisy then tighten it up. if hard to start or lossing power ck to see if too tight. Usually the exhaust will get tight as the valve seat sinks. adjust your carb mixture and timming ok ya haven't done much with the carb except fix some vacume lines and try and get the idle down to 650 only got to 750 rpm adjusting the idle screw with the limiter on it but i'm sure the carb needs quite a bit of adjusting as well. probly gonna try and rebuild it if i can find a carb kit. but i will readjust with the lobes in the 12 o'clock position thanks for the advise it will help alot. also did adjust timing but with the idle at 750 so will do some more on that as well thanks again for the helpful info i apprieciate it alot. Quote Link to comment
DOCSHULTZ Posted September 30, 2011 Author Report Share Posted September 30, 2011 readjusted the valves running much smoother now... thanks for all the input.... now time to do some adjustments on the carb. Quote Link to comment
banzai510(hainz) Posted September 30, 2011 Report Share Posted September 30, 2011 dont rebuild the carb if you dont have to/ the stock carbs are a bitch at leat to me. Weber are EZer but noting really in the rebuildt if besides gaskets, accelp pump diaphrame and needle valve Quote Link to comment
bananahamuck Posted September 30, 2011 Report Share Posted September 30, 2011 By the looks of your first posts your seemed to be over thinking it.. As you may have found valve adjustment on a L motor is alot more forgiving than most engines out there. Quote Link to comment
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