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| Re: [GMCnet] Engine Thrust Bearing Lube Mod [message #197518 is a reply to message #197515] |
Tue, 05 February 2013 21:38   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rob,
I've thought about that, but discounted it because it seems to me simpler,
less risky, and probably just as effective to do the "approved" mod:
Chamfer the insert at the parting line on the side toward the thrust
face. That effectively creates an "oil hole" from the center-of-insert
oil passage to the thrust face. No drilling of the block necessary for the
same effect.
Ken H.
On Tue, Feb 5, 2013 at 10:27 PM, Robert Mueller <robmueller@iinet.net.au>wrote:
> G'day,
>
> I'm a naughty boy for posting this!
>
> http://www.gmcmhphotos.com/photos/g6286-thrust-bearing-modification.html
>
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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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| Re: [GMCnet] Engine Thrust Bearing Lube Mod [message #197525 is a reply to message #197518] |
Tue, 05 February 2013 22:33 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
I was quite surprised when I disassembled the Caddy 500 I have her I found the thrust bearing halves were "modified" as per your
note below.
It was obvious to me that the area had been machined.
Below is a link to the photos of that thrust bearing out of that engine. If you look at the edge of the bearing you can see that the
chamfer is rounded.
http://www.gmcmhphotos.com/photos/g6287-caddy-500-oem-thrust-bearing.html
The guy I bought it from told me it had never been disassembled and from the condition of the engine I believe he was correct.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Ken Henderson
Rob,
I've thought about that, but discounted it because it seems to me simpler,
less risky, and probably just as effective to do the "approved" mod:
Chamfer the insert at the parting line on the side toward the thrust
face. That effectively creates an "oil hole" from the center-of-insert
oil passage to the thrust face. No drilling of the block necessary for the
same effect.
Ken H.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Engine Thrust Bearing Lube Mod [message #197528 is a reply to message #197525] |
Tue, 05 February 2013 23:27 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rob,
The '72 replacement engine also had that feature -- I don't remember about
the first, '76 engine.
Interestingly, the '72's thrust bearing was VERY poorly installed. The
bearing cap was never seated to the rear properly so that the block's
bearing half bore all of the thrust; the cap's thrust surface was barely
worn. I tried to find the photos (which I sent to Dick Paterson at the
time) but can't find them. And I'm pretty sure that engine had never been
opened too.
Ken
On Tue, Feb 5, 2013 at 11:33 PM, Robert Mueller <robmueller@iinet.net.au>wrote:
> Ken,
>
> I was quite surprised when I disassembled the Caddy 500 I have her I found
> the thrust bearing halves were "modified" as per your
> note below.
>
> It was obvious to me that the area had been machined.
>
> Below is a link to the photos of that thrust bearing out of that engine.
> If you look at the edge of the bearing you can see that the
> chamfer is rounded.
>
> http://www.gmcmhphotos.com/photos/g6287-caddy-500-oem-thrust-bearing.html
>
> The guy I bought it from told me it had never been disassembled and from
> the condition of the engine I believe he was correct.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
> -----Original Message-----
> From: Ken Henderson
>
> Rob,
>
> I've thought about that, but discounted it because it seems to me simpler,
> less risky, and probably just as effective to do the "approved" mod:
> Chamfer the insert at the parting line on the side toward the thrust
> face. That effectively creates an "oil hole" from the center-of-insert
> oil passage to the thrust face. No drilling of the block necessary for
> the
> same effect.
>
> Ken H.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Unsubscribe or Change List Options:
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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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| Re: [GMCnet] Engine Thrust Bearing Lube Mod [message #197529 is a reply to message #197525] |
Tue, 05 February 2013 23:29 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Rob,
I've disassembled a couple of Caddy engines and that was the same way on
all the original bearings.
So I copied them on the replacements.
Gary Kosier
-----Original Message-----
From: Robert Mueller
Sent: Tuesday, February 05, 2013 11:33 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Engine Thrust Bearing Lube Mod
Ken,
I was quite surprised when I disassembled the Caddy 500 I have her I found
the thrust bearing halves were "modified" as per your
note below.
It was obvious to me that the area had been machined.
Below is a link to the photos of that thrust bearing out of that engine. If
you look at the edge of the bearing you can see that the
chamfer is rounded.
http://www.gmcmhphotos.com/photos/g6287-caddy-500-oem-thrust-bearing.html
The guy I bought it from told me it had never been disassembled and from the
condition of the engine I believe he was correct.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Ken Henderson
Rob,
I've thought about that, but discounted it because it seems to me simpler,
less risky, and probably just as effective to do the "approved" mod:
Chamfer the insert at the parting line on the side toward the thrust
face. That effectively creates an "oil hole" from the center-of-insert
oil passage to the thrust face. No drilling of the block necessary for the
same effect.
Ken H.
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| Re: [GMCnet] Engine Thrust Bearing Lube Mod [message #197544 is a reply to message #197536] |
Wed, 06 February 2013 09:51 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I had a 1961 Cadillac Coupe DeVille with an optional 345 hp 390 cu in V8.
It had never been apart when I rebuilt the engine, The main bearing was
relieved similarly to the ones in Rob's photo. In those years I believe
some hand work went into optional high performance engines. I think back to
the 55 - 57 Eldorado's with dual 4 barrels.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Feb 6, 2013 4:40 AM, "Robert Mueller" <robmueller@iinet.net.au> wrote:
> Ken / Gary,
>
> The Caddy I have is also a 1972. I did a quick check and it appears that
> the 500 began life as a 472 in 1968 and was stroked up to
> 500 cubic inches in 1970.
>
> It would be interesting to see how far back in Caddy's engine history
> thrust bearings were machined with chamfers in them.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> _______________________________________________
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> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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