How to set lifter preload?
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From: Out on the farm in Central IL
How to set lifter preload? Just did the H/C on my car and from the Dyno graph it was suggested that I check the preload on the Comp R lifters. Sooo...
How do I do that and if I need shims where can I get them? Is there a tool that will let me know that I have the suggested .002 preload? I hope this is just not a shot in the dark but that there is a way to measure.
Also are there adjustable rocker arms out yet that don't require machining the pushrod holes?
Thanks for any info.
How do I do that and if I need shims where can I get them? Is there a tool that will let me know that I have the suggested .002 preload? I hope this is just not a shot in the dark but that there is a way to measure.
Also are there adjustable rocker arms out yet that don't require machining the pushrod holes?
Thanks for any info.
Thread Starter
LS1TECH Sponsor
iTrader: (33)
Joined: Jul 2002
Posts: 4,399
Likes: 0
From: Out on the farm in Central IL
Thanks for the link and the help. I have a few questions. So let's make sure I understand the how to article first. I need to get to zero lash by hand tightening the bolt with no rachet frist. At this point the pushrod should spin a little. After that I use the rachet to hand tighten and it should be no more than 1/16 to 1/4 turn. If more than that I need to shim.
Question #1 What is hand tight? This seems to be a very subjective term.
Question #2 If I need shims where do I get them and what size?
Question #3 Will using a touque wrench to get 22 lb/ft increase preload?
Question #4 Comp R lifters need .002 - .004 preload right?
Thanks.
Question #1 What is hand tight? This seems to be a very subjective term.
Question #2 If I need shims where do I get them and what size?
Question #3 Will using a touque wrench to get 22 lb/ft increase preload?
Question #4 Comp R lifters need .002 - .004 preload right?
Thanks.
FWIW I was watching HP TV yesterday, and they were installing the valvetrain on an old chevy big block I believe. They used a rachet to tighten the lifter slowly and gradually, while spinning the pushrod with their other hand. When they could no longer spin the pushrod, they gave it another 1/2 turn and said woohoo. Not sure how accurate this is or if it would not be the same for a more modern application.
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