[DeTomaso] MME ENGINE - JESEL ROCKER ARM FAILURE

[Dan Mixon]

If the valve geometry was off, that would be the engine builder's
responsibility.

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of JDeRyke at aol.com
Sent: Monday, July 28, 2008 3:45 PM
To: clewis at dmn.net; detomaso at realbig.com
Subject: Re: [DeTomaso] MME ENGINE - JESEL ROCKER ARM FAILURE

Jesel's racing products have an excellent reputation. Rocker arms don't fail

unless they're overstressed. This happens if the engine is over-revved, or
has 
the wrong geometry in the rocker assembly, rarely from a mfgr's defect or 
from too stiff valve springs. I'd have your engine's rockers checked for
proper 
geometry (both heads!) then based on what is found, call Jesel to either put
in 
a claim, or to order replacements for the broken ones. My guess is too-short

pushrods for the rest of the engine's components. It only takes 0.020" or so

to adversely affect rocker geometry; I think   Jesel publishes the correct 
installation procedure to get proper geometry with their parts and it only
takes a 
good eye, a felt-marking pen and a few hours of checking- no special tools 
required. You're right in questioning the rest of the assembly; assuming its
a 
set-up problem, they may all eventually fail from the same problem.   My
best 
guess- J Deryke


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