Author Topic: Engine rebuild phenomenon 1956 Cadillac - heard of before?  (Read 380 times)

Offline carguyblack

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  • Name: Chuck Dykstra
Engine rebuild phenomenon 1956 Cadillac - heard of before?
« on: June 11, 2017, 06:41:27 AM »
The engine shop who is doing the machining of our engine from a 1956 Cadillac told me that when they baked the block, the cylinders sloughed a cylinder shaped sleeve out of each cylinder that they said was a hardened build up of oil and other solids over the 60 years of operation. Apparently, it was novel enough for them to mention it to me. Anyone else ever heard of this occurring?
I'm not worried about it as it more of a curiosity and it looks like it will need to be bored .10 - .20 over when machined.
Chuck
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Offline The Tassie Devil(le)

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Re: Engine rebuild phenomenon 1956 Cadillac - heard of before?
« Reply #1 on: June 11, 2017, 07:30:31 AM »
Never heard of that before.

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Offline Ralph Messina CLC 4937

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Re: Engine rebuild phenomenon 1956 Cadillac - heard of before?
« Reply #2 on: June 11, 2017, 09:09:55 AM »
Chuck,

I’m not familiar with the term “baking” but the temperature would less the ignition flame front. Therefore any residue should have burned off during normal operation. At most, any residue would be a thin film that flakes off like paint….But I’ve not seen that before.  Without seeing the cylinders that sloughed off it’s difficult to be definitive. If the shop still has them check  to see whether they are metallic. If so, the engine has been bored and sleeved in the past. If the cylinders are not available, measure the existing cylinder block bores. If they are more than .010” larger than factory nominal I’d again be suspect that the engine had a major rebuild.  This would not necessarily be a fatal flaw for the block if prior work was done correctly.  That block has enough meat that it could be resleeved again. Be certain that your shop has done this before and is comfortable doing it on your block.

HTH
« Last Edit: June 11, 2017, 12:26:34 PM by Ralph Messina CLC 4937 »
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Offline 35-709

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Re: Engine rebuild phenomenon 1956 Cadillac - heard of before?
« Reply #3 on: June 11, 2017, 09:22:30 AM »
I agree with Ralph Messina, especially --- "If the shop still has them check to see whether they are metallic. If so, the engine has been bored and sleeved in the past."

I have never heard of such a thing (sloughing off a cylinder shaped sleeve built up of oil and other solids) and it kind of makes me wonder about that engine overhaul shop.
« Last Edit: June 11, 2017, 09:24:21 AM by 35-709 »
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Offline carguyblack

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  • Name: Chuck Dykstra
Re: Engine rebuild phenomenon 1956 Cadillac - heard of before?
« Reply #4 on: June 11, 2017, 11:39:34 AM »
Just to reassure everyone, the sleeve of whatever it was dissipated upon touch after coming out of the oven, but it was weird enough for them to mention out of interest, not concern. It certainly wasn't a remnant of an earlier rebuild with a metal sleeve insert as this was the first the engine had ever been opened up.
I didn't mean to convey a concern I had for the well being of the block. It is rock solid with normal for the age wear in the cylinders as is evident by the slight lip at the top of each cylinder now.
Chuck
Chuck Dykstra

1956 Sedan DeVille
1956 Coupe DeVille (2 sold)
1957 Oldsmobile 98 (sold)
1989 Bonneville SSE

Offline TJ Hopland

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Re: Engine rebuild phenomenon 1956 Cadillac - heard of before?
« Reply #5 on: June 14, 2017, 09:39:04 AM »
Could it have been some sort of build up in the bore below the piston?   And in a 56 the piston doesn't drop all the way down in the bore?   
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