comp. trunion upgrade problem
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
This just happened to me too, except I found it on my magnetic oil pan drain bolt. It went through my whole motor and I don't know if it damaged anything. My motor is running fine. Comp is sending me new snap rings and they say they're investigating the problem. I asked if them snap rings were made in China and claim they aren't. This is a $0.04 part that can destroy the whole motor. People that have the COMP LS1 Trunion Kit better check for damaged snap-rings.
TECH Fanatic
Joined: Jun 2011
Posts: 1,343
Likes: 8
From: Katy, TX
One of mine did this when I tried to install it. I didn't over-stretch it, this was a defect. I emailed Comp and they sent a new one.
I wonder if the snap rings are really necessary, anyone run the rockers without them?
I wonder if the snap rings are really necessary, anyone run the rockers without them?
We ran into this problem on the engine dyno, and actually had a few break just like yours. Turns out the bearings were actually walking out of the rocker on some of the rockers. We chalked it up to the fact that we had coating on our rockers. So we pulled them apart, cleaned the rocker bearing surfaces and reassembled them with bearing retainer (green Loctite). If your rockers were previously used, the metal could have oil embedded into it.
I would recommend a thorough cleaning and even scotch brite the mating surfaces before installing the new bearings, and also applying the green Loctite. This should solve the issue.
Of course if you are paying someone else to do it, then you can't be sure what their process is. Take a close look at all the rockers and make sure the bearings are seated in the rocker (like the right one in the second picture). The rocker on the left in the 2nd picture show one of the bearings walking out. As the bearings walk out the trunion is allowed to move more laterally and gets into bind eventually. All of this happening at high rpm is going to break parts, especially small snap rings.
I would recommend a thorough cleaning and even scotch brite the mating surfaces before installing the new bearings, and also applying the green Loctite. This should solve the issue.
Of course if you are paying someone else to do it, then you can't be sure what their process is. Take a close look at all the rockers and make sure the bearings are seated in the rocker (like the right one in the second picture). The rocker on the left in the 2nd picture show one of the bearings walking out. As the bearings walk out the trunion is allowed to move more laterally and gets into bind eventually. All of this happening at high rpm is going to break parts, especially small snap rings.
Last edited by Reckless; Oct 5, 2012 at 10:47 AM.
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
I looked at the new snap-rings that Comp sent me and the symmetry on them is screwed-up. They buy them in bulk and they are definitely made in China from the looks of them. Try to match the Comp snap-rings to a snap-rings that's made in the USA, and use those. I just don't trust the Comp snap rings.
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