valve lash

[supervisor1886]

Well my valve train gives a hard time. I was adjusting it but that doest seem to be correctly done by me. Should I back up the nuts on the rockers in order to allow the pressure build up in the lifters, or just start tightening them if they can be easily turned with my fingers? And another thing. When I rotate the engine 360 would that reliefe the hydrolic pressure in the lifters so there is no hydrolic lock in them (o oil pressure) I suspect that lifters might be done,but theres no evidence that they bleed when I adjust.I tried that twice on a warm engine and the rockers are still loose and noisy all the time.And it looks like when I first went a bit tighter it made even more noise. The second time i added so much preload that I lost both the slack and the compression on the cylenders which is not very good.(the engine run crapy)Also I am not sure if the adjustment can be done on a cold engine? Any ideas?

[supervisor1886]

P.S. All the time I adjust the lifters they are just loose and need more adjustment until its too much and there is no comression. I do it in the correct order no doubt.

[supervisor1886]

Any suggestions?

[supervisor1886]

One more question. Where is the MAF burn off and power relays on a canadian 86 305TPI trans am?

[supervisor1886]

Anyone?

[korndogg]

man relax...someone will answer your question. Give it a little bit.

[-Josh-]

Ok, first off you need a set of feeler guages to set your valve to rocker arm clearance, you can't just do it by hand. I'm pretty sure stock the settings for your engine should be .28 intake and .24 exhaust. So i would just set them at that for now. You can get feeler guages just about anywhere.

One way to check to see if the lifters are getting lubricated is to find a way to drive the cam shaft through the distributor shaft opening. That will tell you which places are getting oil and which ones arent' because it will drive the whole rotating assembly and will activate the oil pump drive that goes to the camshaft.


Good luck

[wrightz28]

If it's the same 86 TPI for both questions, I don't think there is valve lash adjustment after 1984 motors.

[supervisor1886]

Any valve train is adjustable exept some engines with solid lifters.
The feeler gage adjustment. Does it make up for the real valve lash adjustment? Because right now iam really tight (1 turn from loosing comression or one turn in from the factory setting) but the noise doesnt seem to go away. I am trying to avoid all that "valve floating" shit when at high rpms

Well also I heard that if you use poly locks getting zero lash is super easy.

[supervisor1886]

Yeah, the feeler gage methode is good for solid lifters since on hydrolic lifters there is preload on the plungers. The diffrence here is about 14 hp and the life of valve train. (noise too) I guess its pretty important and the factory adjustment is good for 100 miles only.Also GM set the rev limmiter at 5700 because valves getting burnt not fully closing and hitting pistons as well (valve flosting) thats why perfomance people say that its better to set a greater lash for high reving engines.