[DeTomaso] 302 diagnosis

[Charles Engles]

Dear John,

               Which engine is this that you're rebuilding?    The stroker 
in your first Pantera or the non-stroker (?) in your second Pantera?
                Next dumb question: why would the lobe and lifters wear down 
as partners on intakes #2,3,& 6?

                             Warmest regards,  Chuck Engles



----- Original Message ----- 
From: "John Taphorn" <jtaphorn at kingwoodcable.com>
To: "dyogi" <dyogi at hawaii.rr.com>
Cc: <detomaso at realbig.com>
Sent: Sunday, February 24, 2008 2:42 PM
Subject: Re: [DeTomaso] 302 diagnosis


> Dennis
>
> I am presently rebuilding my engine.  Lobe and lifters wore down as 
> partners on intake 2,3&6.  I had low vacuum and didn't check compression, 
> but since the intakes were not opening, it had to be down.
>
> Although, I suppose you checked the cam last time apart, the problem may 
> have occurred on start up.
>
> We diagnosed mine by noticing the rocker arm wasn't moving to open the 
> valve.
>
> JT
>
> ----- Original Message ----- 
> From: "dyogi" <dyogi at hawaii.rr.com>
> To: "'P. Rimov'" <rimov at charter.net>
> Cc: <detomaso at realbig.com>
> Sent: Sunday, February 24, 2008 12:54 PM
> Subject: Re: [DeTomaso] 302 diagnosis
>
>
>> Paul,
>>
>> Thanks for the reply.  The internal vacuum leak was brought up before. 
>> The
>> plugs don't get oily and appear normal.  I actually have already pulled 
>> and
>> resealed the intake using Felpro gaskets with no improvement.
>>
>> No coolant in the oil and no oil in the coolant so I don't think that 
>> it's
>> the head gaskets.  The motor has 24,000 on it and the bores looked good 
>> when
>> it was apart.
>>
>> Aloha,
>>
>> Dennis
>>
>> -----Original Message-----
>> From: P. Rimov [mailto:rimov at charter.net]
>> Sent: Sunday, February 24, 2008 7:09 AM
>> To: Dennis Yogi; Dennis Yogi
>> Subject: Re: [DeTomaso] 302 diagnosis
>>
>> Mr. Yogi:
>>
>> You should be pulling 14-18hg with a mild cam like that. Have you pulled 
>> the
>> spark plugs just after the engine dies? If any of them are dark and oily
>> you may very well have an internal vacuum leak were the gasket is sealed 
>> on
>> the outside of the intake manifold and heads but is not sealed well 
>> between
>> the intake manifold and lower ports. When the engine warms and the engine
>> parts expand
>> at different rates the leak becomes more prevalent and the problem become
>> more apparent
>> more common with the turkey pan style gasket than good quality FMS and
>> Felpro gaskets.
>>
>> Also the compression is really low,,,
>> Make sure your gauge is working accurately. Compression should be 
>> 120-130.
>> Could be valve(s) or piston rings failing. Have you checked your oil for 
>> any
>>
>> coolant. A blown or leaking head
>> gaskets could be causing the low compression.
>>
>> Although a pain, the first thing I would do would replace the intake 
>> gaskets
>>
>> and double check the
>> gauge and your engine compression also check your oil for contaminates
>>
>>
>> Paul
>>
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>


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Checked by AVG Free Edition.
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12:19 PM