[DeTomaso] MME ENGINE - JESEL ROCKER ARM FAILURE

[JDeRyke at aol.com]

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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