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Srays

END673c engine

Question

I have a 1964 Mack B61SX dump truck with the END673c engine. Does anyone know what the "c"

designation means? I can't find any information about this.

Thanks everyone for your great input!

Edited by Srays

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673C was a 250 hp engine, about as big as the early engines were, predecessor to the 237.    terry:D

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The ENDT673c was a 250hp but he is saying END so i dont know about thm but i can remember the END some had a oil cooler and full flow oil filter and the ones before that did not have that.

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Natural aspirated END 673C  is a 187 HP engine.

ENDT 673C is a turbo engine 250 HP as Terry and Glenn indicated.

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52 minutes ago, j hancock said:

Natural aspirated END 673C  is a 187 HP engine.

ENDT 673C is a turbo engine 250 HP as Terry and Glenn indicated.

Didn't know there was a C version in the nonturbo engines, learn something new everyday!    terry:thumb:   Shows our age talking about these engines!

Edited by terry

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Interesting. I thought  the END673P was the only one that was rated at  187hp. Jim is right about  the  C. I have an END673D in the BCR,that the previous owner added a turbo to. That one started  out as 200hp.  Al  

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20 minutes ago, 57 bcr said:

Interesting. I thought  the END673P was the only one that was rated at  187hp. Jim is right about  the  C. I have an END673D in the BCR,that the previous owner added a turbo to. That one started  out as 200hp.  Al  

Don't forget the 711 engine, 211 HP with no turbo. I once had a B model dump with a 711 that local mack dealer put a turbo on, it was one of the best sounding engines i ever heard. Alot of people told me they could tell it was me coming by the sound of it.    terry:D

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The END673 is a  high compression because  it's a non turbo. The END673 B and C are Turbo-ed and are a lower compression ratio with a larger wrist pin.  The END673B and C also have piston coolers and I believe 20 head bolts as opposed to 18 on the END673.

Edited by 41chevy

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Iam forgetting bad but i think the first END with a turbo was a 205 hp and i know it did not have piston coolers and i was thinking its wrist pin was the small pin.I was working at mack when the ENDT673B and C came out and it did have the large wrist pin and piston coolers and was same block as the maxidyne that came along next year.It had differnt injection pump and the fire ring in the head gasket.

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2 hours ago, theakerstwo said:

Iam forgetting bad but i think the first END with a turbo was a 205 hp and i know it did not have piston coolers and i was thinking its wrist pin was the small pin.I was working at mack when the ENDT673B and C came out and it did have the large wrist pin and piston coolers and was same block as the maxidyne that came along next year.It had differnt injection pump and the fire ring in the head gasket.

wasn't that early turbo engine engine a ENDT ?   terry:D

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Terry i cant remember what they called it but it had 18 head bolts instead of 20 and it was with out piston coolers.

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