...

Go Back   Lateral-g Forums > Technical Discussions > Engine
User Name
Password



 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 02-15-2011, 06:10 PM
rwhite692's Avatar
rwhite692 rwhite692 is offline
Senior Member
 
Join Date: Sep 2004
Location: Tracy, CA
Posts: 1,912
Thanks: 0
Thanked 0 Times in 0 Posts
Default Help to ID these roller rockers and problem...

During teardown to do a piston swap for lower CR, I found that four rockers have a condition where the poly lock has galled / "chewed down into" the mating surface of the rocker's main shaft (trunnion)... I did not notice it at first, during teardown. The poly locks themselves look fine.

I didn't build this motor, so I don't know what manufacturer these rockers are. They have no markings on them anywhere, other than the "1.5" ratio on them. They sure look like Comp Cams pieces to me, but I can't be sure. Every set of Comp I've ever had, were engraved "Comp"

Pushrods all look fine, and there are no valvetrain geometry issues. I'm wondering if this motor was run for a time with the poly locks loose (or they became loose, and were eventually tightened) and that is what caused it? Or maybe over-tightening? I can't see over-tightening of the poly lock doing this, to what should be some pretty damn hard material (?)

Anyway, even if that was the case, I would think that the rocker shaft material should not have yielded to the poly lock like this, it's almost like the manufacturer didn't heat treat the shaft material or something. This motor does not have much time on it at all, like less than 2000 miles.

Here is what the rockers look like (these are ones that are OK):





And here is what the four "problem" rockers look like. The worn recess is a good 0.030" deep!







__________________
______________________________________________
1969 Camaro/ Tom Nelson TT 434 / Wayne Due C5 / DSE QLink / and a bunch of other stuff...

Project update thread here:
https://lateral-g.net/forums/showthread.php4?t=12743

My Lateral-G Page

My Shop Build:

http://www.garagejournal.com/forum/s...ad.php?t=16310

Last edited by rwhite692; 02-15-2011 at 06:27 PM.
Reply With Quote
 


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:38 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright Lateral-g.net