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Hey guys,

Last year I was touring the Southwest of England and came across an American Made Yellow Truck and Coach Engine. I would imagine it was used in the war effort somehow.

Ddoes anyone know what model/year it is? What would it look like when it was new? What do you think it came out of?


imgur.com

Since Yellow Coach was a General Motors brand, that one is probably one of the GMC truck engines. A lot of 270's were used in military rigs during WW II, but the smaller displacement engines like the 228 and 248 look the same. The general shape of the valve cover and bellhousing also suggest "GMC". The stamped number on a machined pad behind the distributor would have begun with the engine displacement- - -"228/248/270" etc. The larger GMC engines like the 426 and 503 have the carb and exhaust on the other side.
Jerry

That is a GMC engine. Displacement should be stamped on the distributor pad.

The weird part is the "Transmission". It almost looks like something out of a boat.
Fred

That's exactly what I was thinking.

That would make sense that it came out of a boat. I found it in Brixham, which is right on the English Channel!

That's definitely a GMC engine 99% positive if came out of an early war truck, the updated when rebuilt. Early trucks would not have PCV from the factory, but they were retrofitted during service.

You can see the adapter ring bolted to the bellhousing... its not the Clark 5speed that came with the truck.

Governor indicates probably 1.5 ton truck or larger, originally, before trans change. DUKW would have had normal trans driving, probably 270.

Ed

So is this what it looked like originally then? (scroll down a bit)

Detroit History

IS there anywhere I can download the original owner's manual for the GMC 270?

Hy thepooch, thank you very much for posting the Detroit History link, great information there!