Rocker bolt backing out
Rocker bolt backing out So for the second time in less than 3 months or 3,000 miles the offset rocker on CYL #1 bolt has backed out and allowed the rocker to fall out of place and function. Anyone else seen this issue? All other are tight and it was torqued to factory spec. Also this time I put a lot of lock tite and its still backing out.
This was after repeated HIGH boost runs. Setup on heads are as follows:
L92
Stock valves
5 angle valve job
BTR .660 springs
Comp pushrods
This was after repeated HIGH boost runs. Setup on heads are as follows:
L92
Stock valves
5 angle valve job
BTR .660 springs
Comp pushrods
Last edited by oscs; Mar 21, 2016 at 03:58 PM.
Originally Posted by 93camaro_zzz
That has to be annoying. Weird though. I have never had one back out.
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Originally Posted by stevieturbo
same bolt...ever replaced the bolts ?
God thread lock can be a ballix to screw out nevermind it backing out on it's own.
Just how loose or how many turns do you think it actually got ?
God thread lock can be a ballix to screw out nevermind it backing out on it's own.
Just how loose or how many turns do you think it actually got ?
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Cant see any need to ever replace bolts...but maybe something is screwed up with it ?
I only loctite the intake side bolts because they break through into the runners, just use regular green Wurth stuff.
It's tight to remove even after the engine has been running for ages.
I only loctite the intake side bolts because they break through into the runners, just use regular green Wurth stuff.
It's tight to remove even after the engine has been running for ages.
Cleaned out the hole last night and ran a tap through it. None of the threads where missing and besides for a few chips and what looked like never seez at the bottom of the hole, all was well. The bolt was slightly bent but I'm almost positive that was a result of the rocker coming off and not the cause. Erik would have never assembled the motor with a bent bolt.
Anyhow, got a new bolt in with a little loc tite and we will see what happens from here.
Anyhow, got a new bolt in with a little loc tite and we will see what happens from here.
Originally Posted by 3 window
I'd bet pretty big money that most GM techs don't loctite rocker bolts when they reinstall. One backing out is strange.
Originally Posted by Hou_tx_ss
I was doing some testing up 99 a few weeks back and heard a weird sound in the top of the motor. It kind of went away so I just limped home and I felt like the car was down on power. I pulled the valve covers and sure enough I had a rocker bolt that had backed out. I took all the steps you did and haven't had an issue since. Nothing was damaged and I have no idea how it backed out.
Do you think that the bolt is just too small to withstand the pressure of a dual spring package? The kind of pressure these springs generate are good enough for a BBC engine which uses a MUCH larger stud. These bolts flex so much when changing the springs I keep thinking which one is going to strip out!!
Originally Posted by 69-chvl
Do you think that the bolt is just too small to withstand the pressure of a dual spring package? The kind of pressure these springs generate are good enough for a BBC engine which uses a MUCH larger stud. These bolts flex so much when changing the springs I keep thinking which one is going to strip out!!