[DeTomaso] MME ENGINE - JESEL ROCKER ARM FAILURE

Larry - Ohio Time Corp larry at ohiotimecorp.com
Mon Jul 28 18:17:22 EDT 2008


Hi Charlie,

If I recall correctly you also had the "factory" fix your valve problem too.

Larry (check the wiring) - Cleveland

 

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Charles McCall
Sent: Monday, July 28, 2008 5:53 PM
To: asajay at asajay.com; detomaso at realbig.com
Subject: Re: [DeTomaso] MME ENGINE - JESEL ROCKER ARM FAILURE

I had all kinds of problems several years ago with quality rockers. 

The problem didn't come from poor quality roller rockers - it came from a
variety of assembly issues in the heads. I'm with the others that the root
cause is probably not faulty roller rockers, but instead they are suffering
from something else that isn't quite right. 

Replacing the rockers with a different brand might not be the cure. I'd
check all the geometry issues and assembly issues first. But I would have
thought that MME would have done that already... 

Oh, and mine didn't make it to the 2000 mile mark before they began to self
destruct... And the end result was a second complete engine rebuild, so I'd
tread carefully... 

Not sure if this helps any, but one person's experience... 

Charles McCall
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness across Europe"
http://members.aol.com/PanteraGT5S1985/


-----Mensaje original-----
De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
nombre de asajay at asajay.com
Enviado el: lunes, 28 de julio de 2008 22:44
Para: detomaso at realbig.com
Asunto: Re: [DeTomaso] MME ENGINE - JESEL ROCKER ARM FAILURE

My last two sets of full-roller rockers both came from Ford Racing.   
And I think they are actually getting them done by Crane or some other  
vendor.  I have no complaints.

Inspect the rest of the rocker arms.  If they all look good, just  
replace the two.  If they don't, replace them all with something else.

Asa Jay

Quoting Chris Lewis <clewis at dmn.net>:

> OK so after only around 2000 street miles two of the Jesel Aluminum   
> Shaft Rocker arms fail on my MME 427 Clevor.  One intake and one   
> exhaust on two
> seperate cylinders both cylinders on the passenger side bank.  The   
> motor was run-in by MME, dynoed by MME with 10-12 pulls, and hot   
> lash adjusted by
> MME.  I was there for all of this except for the run-in.  Since that  
>  time the valve covers have never been off.
>
> Any ideas as to why two brand new rocker arms would fail?  My   
> mechanic says that they failed in exactly the same spot on the push   
> rod side of the
> arm.  Now I have no faith in the rest of the arms.  When are the   
> remaining rocker arms going to fail?  I don't want to replace them   
> with the same
> thing if they are just going to break again in another 2000 miles.
>
>
> Stainless steel rocker arms from Jesel are very expensive,  $200.oo   
> each.  $3200 to make sure my motor stays together?  It's getting a   
> little
> expensive over here
>
> Chris Lewis
> Clewis at dmn.net
>
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