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[GMCnet] Not AGAIN!!! [message #224272]

Tue, 01 October 2013 20:59

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma:

Senior Member

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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[Message index]

		[GMCnet] Not AGAIN!!! By: Ken Henderson on Tue, 01 October 2013 20:59
		Re: [GMCnet] Not AGAIN!!! By: Jeff Marten on Tue, 01 October 2013 21:07
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 19:35
		Re: [GMCnet] Not AGAIN!!! By: kerry pinkerton on Tue, 01 October 2013 21:19
		Re: [GMCnet] Not AGAIN!!! By: kerry pinkerton on Tue, 01 October 2013 21:24
		Re: [GMCnet] Not AGAIN!!! By: cadelec on Tue, 01 October 2013 21:37
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 19:38
		Re: [GMCnet] Not AGAIN!!! By: George Beckman on Wed, 02 October 2013 00:31
		Re: [GMCnet] Not AGAIN!!! By: Steven Ferguson on Wed, 02 October 2013 07:36
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Wed, 02 October 2013 07:44
		Re: [GMCnet] Not AGAIN!!! By: djeffers on Wed, 02 October 2013 12:36
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Wed, 02 October 2013 14:48
		Re: [GMCnet] Not AGAIN!!! By: djeffers on Thu, 03 October 2013 00:43
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 06:58
		Re: [GMCnet] Not AGAIN!!! By: djeffers on Thu, 03 October 2013 16:57
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 19:32
		Re: [GMCnet] Not AGAIN!!! By: djeffers on Thu, 03 October 2013 21:57
		Re: [GMCnet] Not AGAIN!!! By: Steven Ferguson on Thu, 03 October 2013 07:55
		Re: [GMCnet] Not AGAIN!!! By: Steven Ferguson on Thu, 03 October 2013 08:00
		Re: [GMCnet] Not AGAIN!!! By: A Hamilto on Wed, 02 October 2013 13:47
		Re: [GMCnet] Not AGAIN!!! By: A Hamilto on Wed, 02 October 2013 13:51
		Re: [GMCnet] Not AGAIN!!! By: cbryan on Wed, 02 October 2013 20:48
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Wed, 02 October 2013 22:29
		Re: [GMCnet] Not AGAIN!!! By: jim kanomata on Thu, 03 October 2013 00:48
		Re: [GMCnet] Not AGAIN!!! By: Dave Mumert on Thu, 03 October 2013 10:46
		Re: [GMCnet] Not AGAIN!!! By: hal kading on Thu, 03 October 2013 12:03
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 19:22
		Re: [GMCnet] Not AGAIN!!! By: GMC_LES on Thu, 03 October 2013 19:40
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 19:58
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 19:41
		Re: [GMCnet] Not AGAIN!!! By: Larry on Thu, 03 October 2013 20:59
		Re: [GMCnet] Not AGAIN!!! By: Larry on Thu, 03 October 2013 21:07
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 03 October 2013 22:52
		Re: [GMCnet] Not AGAIN!!! By: Larry on Fri, 04 October 2013 09:13
		Re: [GMCnet] Not AGAIN!!! By: Bob de Kruyff on Thu, 10 October 2013 20:10
		Re: [GMCnet] Not AGAIN!!! By: JohnL455 on Thu, 10 October 2013 20:25
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Thu, 10 October 2013 21:17
		Re: [GMCnet] Not AGAIN!!! By: jhbridges on Fri, 11 October 2013 11:24
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Fri, 11 October 2013 14:45
		Re: [GMCnet] Not AGAIN!!! By: Matt Colie on Sat, 12 October 2013 07:46
		Re: [GMCnet] Not AGAIN!!! By: jhbridges on Sat, 12 October 2013 09:19
		Re: [GMCnet] Not AGAIN!!! By: Bill Freeman on Sat, 19 October 2013 14:52
		Re: [GMCnet] Not AGAIN!!! By: Bill Freeman on Sat, 19 October 2013 14:56
		Re: [GMCnet] Not AGAIN!!! By: Cadillackeeper on Fri, 11 October 2013 16:03
		Re: [GMCnet] Not AGAIN!!! By: Ken Henderson on Fri, 11 October 2013 16:47
		Re: [GMCnet] Not AGAIN!!! By: winter on Sun, 20 October 2013 09:00

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