Hydro lifter going bad????
Thread Starter
Pro
Joined: Jan 2011
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From: Alexandria VA
Hydro lifter going bad????
I have a 72 with a 454 that has that clacking noise coming from the passenger side V cover. I adjusted the lash in all of the valves today following the process on the Century Performance site. Initially I thought I had solved the issue upon starting the motor (nice and quite) but as things ran for a min or 2 that clacky noise started to come back.
Is this an indication of a failing lifter? Should go through the process again on that side?
Is this an indication of a failing lifter? Should go through the process again on that side?
Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
The stud could be getting loose...or the nut could be getting worn out. Those rocker stud nuts have deformed threads so that they stay locked in place after adjustment. The more they have been adjusted, the less tight they are. Eventually, they won't hold place anymore.
If that's your problem, you can buy new rocker stud nuts from Chevy or you can replace each [stock] nut with two 'jamb' nuts. Use the first to set the lifter, then [while holding the first in place] tighten the second one on top of the first. They won't move.
If that's your problem, you can buy new rocker stud nuts from Chevy or you can replace each [stock] nut with two 'jamb' nuts. Use the first to set the lifter, then [while holding the first in place] tighten the second one on top of the first. They won't move.
Last edited by 7T1vette; Apr 13, 2014 at 08:27 PM.
Thread Starter
Pro
Joined: Jan 2011
Posts: 586
Likes: 10
From: Alexandria VA
Ok, thanks for the responses everyone. I'll check the studs to see if any of them are walking out then replace the nuts on that side and adjust the lash.
If those two steps don't solve the issue I suspect we'll need to pull the lid and take a look at the cam and lifters?
If those two steps don't solve the issue I suspect we'll need to pull the lid and take a look at the cam and lifters?
