Need your professional help

Brown Swiss · May 14, 2020

The 49 GMCs engine is all cruddy inside,
not wanting to take it all apart! Know of a
good way to clean it out!

I pulled the valve cover and side covers
off to check the valves and push rods were
free before trying to turn the engine over
by hand! It looked like that so I dropped
the oil pan also! It looks worse than it
is!

Blackhole49 · May 14, 2020

If you actually hope to use the engine again, I would strip if down to a bare block and head and have it dipped. My answer to your question is, NO!

warbaby · May 14, 2020

Yes, you will need a complete strip-down and clean up. You'll never get all the journal scarring, oil-passage clogging rust particles removed any other way.

Janicholson · May 14, 2020

No matter the method, there will be contamination into journals and passages while it is in the chassis. i own one of those (series) in a 51 3/4 ton I can see from where I am sitting. Blackhole 49 is correct. A gasket set, removal of inserts, and hot tanking. It at least is a modern engine with inserts, not a poured bearing engine. Pressure flush all oil passages when prepping to reassemble. Jim

Steve@Advance · May 14, 2020

Appears to have gotten water in the engine.

Could be from condensation, but also could be from a head gasket, cracked head, or freeze cracked.

If you don't know any history on it, take nothing for granted.

Agree with others, it needs to come apart. Do it now and it may be salvageable. Do it later and risk doing more damage.

OregonAaron · May 14, 2020

That this is toast. Like it or not it's full on rebuild time or find a different engine.

coshoo · May 14, 2020

I'd look for a different engine before tearing into that one. But I agree with the others that that one has to have a rebuild. But look at the bright side- if you do use that engine, you will be an expert at dealing with sheared-off bolts and studs by the time you're done! lol

JerryCPP(WA) · May 14, 2020

I agree with the others it needs a complete tear down. If you want a bolt-in replacement engine that is somewhat more available, find a 235 cubic inch Chevrolet, 1955 to 1962 ('63 for trucks) or a more rare 261. Older 235's and 216's will fit, but may not have a full pressure oil system. I'm on my 3rd 235 in my '48 GMC 3/4 ton, so I know it's an easy swap. Good luck - they're a great old truck.

ss55 · May 14, 2020

Dumb question: Would a newer Chevy/GMC 292 in-line six or a GMC V-6 bolt in?

JerryCPP(WA) · May 14, 2020

General Motors made some major changes with the V-6 and the 194-230-250-292 inline engines. There are probably adapters for the later engines, or you can install a complete engine/transmission, but they won't be bolt in. The only bolt-in engines are the 228-248-270-302 GMC or the 216-235-261 Chevrolet. You might want to go to the StoveBolt.com web site. Those guys live and breath these wonderful old engines.

David G · May 14, 2020

I would not try to turn anything on that without complete rebuild.

caterpillar guy · May 15, 2020

Wagon time just put a tongue on it and pull it with a tractor. Best wagons built old GM wagons. Depending on size I might even have an old engine to fit that took one out of an old 50's model GMC when I used it for a wagon 35 years ago. Was setting on it's side out back. Not sure what it was other than inline 6.

Need your professional help

Brown Swiss

Well-known Member

Blackhole49

Well-known Member

warbaby

Well-known Member

Janicholson

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Steve@Advance

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OregonAaron

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coshoo

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JerryCPP(WA)

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ss55

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JerryCPP(WA)

Member

David G

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caterpillar guy

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