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Re: [GMCnet] Reviving the Cad 500 [message #164636 is a reply to message #164425] Thu, 29 March 2012 18:03 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
Richard,

I did have a weirdly worn transmission input bushing, but I'm convinced
that was due to the definitely misaligned flex plate. Which, incidentally,
doesn't do a lot of flexing on a Cadillac, IMHO. It's just too thick and
has no weakening cuts like some I've seen.

We have had some discussion of mis-aligned transmission/engine interfaces,
including the replacement of dowels with offset ones. Frankly, I discount
that possibility in this case because the transmission lived peaceably with
my Olds engine (and possibly several others), and the Cad engine presumably
had a good marriage with its transmission during its first 76,000 miles
with no thrust bearing damage. I find it unlikely, statistically, that the
two would have trouble with a new coupling between them.

Just looking at the various thrust bearings for Chevy, Olds, and Cadillac
engines, I'd guess that the 210 lbf rating I've seen for the Chevy 454 is
pretty close to the same as the others -- not much is allowed, in other
words.

No question I'll post anything I learn relative to the failures -- no
matter how embarrassing it may turn out to be -- I'm 'WAY too old &
independent to worry about my reputation. :-)

Ken H.



On Wed, Mar 28, 2012 at 2:48 AM, Richard Brown wrote:

> A question; If I remember correctly, wasn't the bushing that the torque
> converter snout rides in replaced because of uneven wear? I remember
> reading that some dowel pin holes were drilled slightly offset from the
> factory. Could a mis-aligned transmission mounting cause thrust bearing
> problems? This may have already been discussed, but if so I missed it. I've
> heard that some engines are more tolerant than others in this regard. I do
> remember a discussion about a possible overpressure of the torque converter
> because of a restricted cooler. I'm asking because I know someone who just
> had to replace his torque converter & bushing on his GM car. The mechanic
> used a standard bellhousing & a dial indicator to check the alignment &
> install offset dowel pins. I didn't see how it was done but just know what
> was done. After the alignment, a rebuilt transmission was installed & so
> far it's doing OK. While the trans & motor was out, he rebuilt the motor
> and noticed
> that the thrust bearing clearance was pretty loose. If the solution is
> found, I'd like to pass the info on. It's possible that since Cadillac
> engines were never fitted with manual transmissions, they are less tolerant
> of excessive thrust to the crank. Some earlier Olds 455s were fitted with
> manual transmissions, so perhaps they are more able to stand the stress.
>
>
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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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