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Re: [GMCnet] Reviving the Cad 500 [message #165231 is a reply to message #165215] Tue, 03 April 2012 19:36 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
Larry,

Last night I filled out the information sheet at MPC. Today, while at the
engine shop, I got a call from Dick Lewis. After listening to my tale of
woes and tests, he significantly did NOT try to sell me a torque converter
-- he's convinced that I don't need one. Said he'd be glad to, but didn't
think that's the source of my problem. He was disappointed that I did not
actually drive the coach while I had the hydraulics instrumented. He says
I should immediately drive it with a gauge on the converter output and load
the engine to see what the pressure does; anything in the range of 100 psi
is TOO much. He wasn't even satisfied with my static, in-Drive, runs to
2000 rpm with the coolant line open and blocked. I'll certainly install
the gauge for the first test drive when I get running again.

Every time I talk to an "engine man" he convinces me the problem's the
transmission or the torque converter. Then I talk to a "converter man" and
he convinces me it's the transmission or the engine. Then Manny convinces
me it's the engine or the converter. It's bad enough having my arms pulled,
and my legs pulled, without having the 3rd appendage attacked. :-(

When I tear the engine down again, we will jig it up and check the main
bore alignment. But the original crank and bearings, when this whole
fiasco began, looked, mic'd, and Plasigaged PERFECT -- low to middle of all
clearance specs, including bearing tapers.

And the shop that rebuilt the crank has one of the best reputations in the
state. Again, John Beaver and I examined everything carefully, and I
Plastigaged every bearing without seeing anything to be concerned about.

Rest assured, when the engine goes together the next time, we'll be triple
checking everything. If everything receives the meticulous care I saw
today while watching John machine a racing engine head, there's no excuse
for any problem. Frankly, it has received that care both times, and will
again. He's as frustrated as I am -- even though my participation and his
free participation frees him of warranty liability. :-)

Ken H.



On Tue, Apr 3, 2012 at 5:14 PM, Larry wrote:

>
> Contact Dick Lewis at Midwest Performance Converter. He is building a
> number of converters for some of the guys that have 500 Cad motors.
>
> 800-262-2063
>
> http/www.midwestconverter.com
>
> Contact Bob Miller for a review on how he likes his. Sorry, don't have his
> # with me, but should be in the GMCMI Membership roster.
>
> I'm skeptical also of a TC problem. Are you sure your line bore is
> straight, and when you plastigaged your motor, was the plastigage even all
> of the way across the whole bearing. I've seen crank grinders get lazy
> with their grinding and not trim the grinding wheel often enough to get a
> flat surface across the crank throws and mains meaning the grinding wheel
> wears most at the edges and then does not grind flat all of the way to the
> edge of the bearing surface. Just a thought...
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
 
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