| Re: [GMCnet] 2017 Breakdown & Engine Replacement [message #326225 is a reply to message #326220] |
Tue, 21 November 2017 17:38   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Back in the '50s, Olds and Cad v8 engines were notorious for breaking
pistons. They were just learning about "slipper skirt" vs full circle
designs. Once they quit casting them and started forging them, "impact
extrusion" was the term the factory used to describe the process, the
pistons quit failing like that. Been a long time since I have seen that
failure. Sometimes it is caused by someone dropping the rod and piston
assembly, picking it up, and putting it in the bore before anyone notices
what they did. "Stuff happens".
Any marks on the top of the piston like needle bearings were bouncing
around in there when it was running? Classic evidence of detonation if you
see that. It darn sure will break the sides off pistons like that.
Jim Hupy
Salem, Oregon
On Nov 21, 2017 3:21 PM, "Larry" wrote:
Ray Erspamer wrote on Tue, 21 November 2017 11:29
> Back in September I posted I had engine woes. I just wanted to update
everyone on what had happened. It turned out my severe knocking was #2
> piston had broke apart. We ended up pulling the engine, having it
rebuilt and reinstalling it. My thanks to my awesome friend Steve
Southworth who
> let me tie up his building for 7 weeks. Engine was rebuilt by D&R
Engine & Machine in Marion, Iowa. They contacted Dick Paterson for the
spec's
> on the cam and other parts and they were awesome to work with. Pictures
can be seen via the attached link. Thanks everyone for your input and
> support along the way. I am hoping that this is something I never have
to do again.
>
> http://www.gmcmhphotos.com/photos/g7117-2017-engine-woes.html
>
> Ray
Ray,
I looked at the pics, particularly the images of the piston. Never seen
something like that. Post mortem give you any idea why that happened?
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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