Home » Public Forums » GMCnet » [GMCnet] Not AGAIN!!!
[GMCnet] Not AGAIN!!! [message #224272] |
Tue, 01 October 2013 20:59 |
Ken Henderson
Messages: 8726 Registered: March 2004 Location: Americus, GA
Karma:
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Senior Member |
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Yep, I pulled the right rocker cover off of the Cad500 this afternoon.
Guess what? The rocker pedestal I swiped from one of JimK's engines in
June failed in Mississippi! :-(
Same sequence of events, apparently: The exhaust valve (maybe it's bent or
otherwise binding?) broke its "arm" off of the T-pedestal, followed by the
intake doing the same thing, perhaps because of the excess load of trying
to open against trapped combustion/exhaust gases.
The first pedestal that broke had a dark shadow all around the edges of the
broken area; I couldn't decide whether that was from heat treatment or was
evidence of fatigue cracking. This pedestal, on the exhaust side, is dark
all the way across the broken area, as if it had a fatigue crack for a long
time. The other, intake, side also has more darkened area than the first
pedestal, but does have some shiny, recently broken, material, so it was
not fatigued nearly as badly as the exhaust side.
Now I'm dubious about what I should do: New pedestals are available, but
at $20 each, they, if mated with new rockers, cost about as much as a
shaft-based system with new rockers and push rods. That SHOULD, IMHO, be a
more reliable system -- but the T-pedestals seem to have served most
Cadillacs well since the early 60's.
Any applicable experience to share?
Ken H.
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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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[GMCnet] Not AGAIN!!!
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By: cadelec on Tue, 01 October 2013 21:37
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By: djeffers on Wed, 02 October 2013 12:36
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By: djeffers on Thu, 03 October 2013 00:43
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By: djeffers on Thu, 03 October 2013 16:57
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By: djeffers on Thu, 03 October 2013 21:57
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By: cbryan on Wed, 02 October 2013 20:48
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By: GMC_LES on Thu, 03 October 2013 19:40
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By: Larry on Thu, 03 October 2013 20:59
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Re: [GMCnet] Not AGAIN!!!
By: Larry on Thu, 03 October 2013 21:07
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By: Larry on Fri, 04 October 2013 09:13
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By: JohnL455 on Thu, 10 October 2013 20:25
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Re: [GMCnet] Not AGAIN!!!
By: winter on Sun, 20 October 2013 09:00
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