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Re: [GMCnet] Reviving the Cad 500 [message #164355 is a reply to message #164353] Tue, 27 March 2012 14:21 Go to previous messageGo to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
Senior Member
Les,

When we increased the thrust bearing clearance, we did so on a fine surface
grinder, operating only on the forward face of the bearing. To ensure that
each half was ground equally, to prevent misalignment on the aft face, the
shells were mounted on the main cap. After the grinding was completed, the
entire bearing and cap were thoroughly cleaned to remove residual abrasive.
All a routine operation for the 40 year experienced engine builder.

I'm thoroughly convinced that the cause is external to the engine -- as
anyone would be when experiencing identical failures before and after
engine work.

The only block-transmission alignment check I did was to ensure that the
the dowel pins fit snugly. Since I was convinced that the misaligned flex
plate and consequent transmission input bushing damage were the cause, I
was very skeptical about any other cause. I'm no longer so skeptical.

I will definitely be checking transmission pressures and will publish the
results.

Thanks for you inputs.

Ken H.


> On Tue, Mar 27, 2012 at 8:37 AM, Les Burt <burtco99@yahoo.com> wrote:
>
>> Ken,
>> Out of curiosity, when you "dressed" the thrust bearing to obtain the
>> correct clearances, did you dress the front or rear surface of the shell?
>> Was this done with a stone or abrasive paper? Using such forms of abrasive
>> will leave some grit embedded in the surface of the bearing. The best way
>> to remove this fine grit is to buff up the surface on a clean piece of
>> paper resting on a flat surface.
>>
>> I'm also curious to know if you did any alignment checks of the block to
>> transmission?
>>
>> I'm assuming that you will be checking line pressures before pulling the
>> transmission. Please post your results, even of they appear to be within
>> reasonable limits.
>>
>>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
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