Valve Adjustment
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5th Wheeling
Joined: Nov 2006
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Valve Adjustment
I'm a newbie to engine work. I need to check / adjust the valves on my 86. My repair manual is less than helpful. Can anyone tell me where to find instructions and tech info?
Thanks,
Thanks,
Moderator
Joined: Aug 2002
Posts: 6,104
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From: Southern California
It's really pretty easy......assuming they are hydraulic adjustable.....
Pull the valve convers & start the engine......
with the engine idling, (one valve at a time) loosen the locknut on the adjuster ( visually obvious), rotating at 1/4 turn at a time, loosen the adjustment until you hear 'clacking"...it's loose, then tighten, slowly, 1/4 of a turn at a time until the clacking is gone...then slowly tighten an additional 1/4 to 1/2 of a turn (no more than 1/2)....you will typically find the engine will run "sweeter' at a certain spot....you'll know when......tighten the lock nut and you're done!
Pull the valve convers & start the engine......
with the engine idling, (one valve at a time) loosen the locknut on the adjuster ( visually obvious), rotating at 1/4 turn at a time, loosen the adjustment until you hear 'clacking"...it's loose, then tighten, slowly, 1/4 of a turn at a time until the clacking is gone...then slowly tighten an additional 1/4 to 1/2 of a turn (no more than 1/2)....you will typically find the engine will run "sweeter' at a certain spot....you'll know when......tighten the lock nut and you're done!
Hotshot
Joined: Jun 2015
Posts: 12,875
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What engine? You shouldn't have to adjust the lash on a hydraulic lifter. Maybe the cam is worn or has a bad lobe or the lifters have collapsed. Does truck have good oil pressure? Have you had the valve cover off and checked for sludge?
Moderator
Joined: Aug 2002
Posts: 6,104
Likes: 384
From: Southern California
Not true....hydraulics come in both adjustable and non-adjustable versions.......I'm assuming because of his request, he had adjustibles.
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