Cam chest tapping when warm
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5th Gear
Joined: Aug 2020
Posts: 9
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From: Texas
Cam chest tapping when warm
Finished a stage IV build on a 107. Had a delay in installing pushrods. Lifters were soaked but installed rods 2 days later.
initial start up valve train tapping heard. Rods backed off from 4 to 3-1/2 turns. Now Cold start no valve train tapping, once warms up, tapping heard.
did lifters drain and 4 turns was too much, once engine warms lifters fill and 3-1/2 turns is still too much? Back off another 1/2 turn? adj once engine warms/pressures up?
initial start up valve train tapping heard. Rods backed off from 4 to 3-1/2 turns. Now Cold start no valve train tapping, once warms up, tapping heard.
did lifters drain and 4 turns was too much, once engine warms lifters fill and 3-1/2 turns is still too much? Back off another 1/2 turn? adj once engine warms/pressures up?
Road Master
Joined: Jun 2019
Posts: 952
Likes: 528
From: Richmond TX
The number of turns recommended depends very much on which adjustable pushrods you're using. The threads per inch matter. Usually the manufacturer specifies the number of turns or sometimes flats to put the lifter in the middle of its range, i.e. .100" of the total .200" of travel. Some posters on this forum, including me, found that their lifters didn't get quiet until the pushrods were extended further than the recommendation. In my case I went to .125". Note, I am using the word 'quiet' to mean acceptably low. I've never managed to get my motor to be free of valve gear noise.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
Finished a stage IV build on a 107. Had a delay in installing pushrods. Lifters were soaked but installed rods 2 days later.
initial start up valve train tapping heard. Rods backed off from 4 to 3-1/2 turns. Now Cold start no valve train tapping, once warms up, tapping heard.
did lifters drain and 4 turns was too much, once engine warms lifters fill and 3-1/2 turns is still too much? Back off another 1/2 turn? adj once engine warms/pressures up?
initial start up valve train tapping heard. Rods backed off from 4 to 3-1/2 turns. Now Cold start no valve train tapping, once warms up, tapping heard.
did lifters drain and 4 turns was too much, once engine warms lifters fill and 3-1/2 turns is still too much? Back off another 1/2 turn? adj once engine warms/pressures up?
Road Warrior
Joined: Apr 2022
Posts: 1,514
Likes: 1,823
From: Omaha
He was asking what engine do you have and what lifters and push rods did you use.
Last edited by WONKEY; Jan 29, 2024 at 10:30 AM.
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 437
From: florida
Warm ticking can happen wout installation problems.
What cams? What AC? Was rocker shaft endplay checked? What brand lifters? There’s too much not mentioned for anyone to help. Adjusting pushrods probably not the answer
What cams? What AC? Was rocker shaft endplay checked? What brand lifters? There’s too much not mentioned for anyone to help. Adjusting pushrods probably not the answer
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briggs07
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