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OEM lifter preload

Comcal76

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Hi all
Does anyone know the V6 Buick OEM lifter preload thanks in advance.
 

shane_3800

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Hi all
Does anyone know the V6 Buick OEM lifter preload thanks in advance.

They're hydraulic non adjustable so no OEM preload setting. Common practice for any push rod engine is to remove lash and go half to 3/4 of a turn further on the adjuster when adjusting roller rockers on hydrualic lifters.
 

shane_3800

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Also just go over every adjuster and take the lash out on all the push rods. Then turn the crank shaft 90 deg re-check every push rod some will be loose re-adjust those ones. Turn for a second time 90 deg re-check again like before. Now rotate the crank a further 90 deg and re-check for the third time and if any still have play adjust that out. Now rotate 90 deg again and check do this 3 more times so you equal two rotations of the crank shaft. You have now set all the push rods at 0 lash. Now only if you have completed the first step go to every rocker and adjust in 3/4 of a turn. It does not matter about where the crank is on the final step as all the lash is at 0 so you can just wind every adjuster in 3/4 of a turn.
 
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