valve lash trouble

aer212

aer212

New member
Joined
Feb 16, 2009
Messages
518
In the process of reassembling and I cant find tdc. Instructions say put balancer so tdc mark is at 12 oclock and if number 1 rockers arent loose rotate 360 and try again. I did that and both time the rockers weren't loose, they were tight. The springs weren't compressed but it was tight enough I couldnt move them. I was wondering if the arp 625's would compress it more so the head would be lower thus lifting the pushrods higher. Also when they surfaced the head they took .008 off to make it flat and take out some scratches. Would those combined equal tight rockers? Anyway where do I start now? How do I find top dead center? Need to get it going by this weekend so any help is appreciated! This is on a 6.7 cummins.
 
I'd loosen all of the adjuster nuts and start over.

I agree, combo of milling the head and ARP's will pull the head tighter and tighten up lash too much.
 
Big Blue24 said:
I'd loosen all of the adjuster nuts and start over.

I agree, combo of milling the head and ARP's will pull the head tighter and tighten up lash too much.
Click to expand...

X2

At tdc both will be about equal... 180 out the exhaust will be compressed on the approach..

:Cheer:
 
Last edited:
Yea loosen them all up and start over, just make sure that both #1 pushrods are up and equal, with TDC mark on the top.
 
Thanks for the help guys, I figured out what it was! I replaced the stock pushrods with some from Hamilton. They are slightly longer and the rocker ball doesn't sit as deep in the Hamilton pushrods. So that with the .008 taken off the head and the arp 625's made them tight. Hope this helps someone else also.
 
They are .020" longer due to the fact that most people that run them have an aftermarket cam. Most after market cams have .015-.035" smaller base circles and the longer pushrod is needed to make sure the rocker geometry is correct.


Zach Hamilton
 
You must log in or register to reply here.
Back
Top