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Cummins Models H and NH Diesels - what were they used on?


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  #1  
Old 09-29-2009, 02:49:11 PM
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Robt. Robt. is offline
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Default Cummins Models H and NH Diesels - what were they used on?

Picked up a "unit rebuilding" manual for these engines and was wondering what they were used on/in? Manual is called "Bulletin No. 6301-A" and dated december 1948. Nice quality paper and printing with lots of photos; too bad they're not all that good. It's in a Caterpillar Service Magazine cover which I assume is unrelated?

Thanks!
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Old 09-29-2009, 04:12:39 PM
John Schwiebert John Schwiebert is offline
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Default Re: Cummins Models H and NH Diesels - what were they used on?

The model H and NH Which meant the new model H (Four valve heads) were the in truck engines in the 50's for one plus many other uses.
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Old 09-29-2009, 04:58:41 PM
Rodrigue Caron Rodrigue Caron is offline
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Default Re: Cummins Models H and NH Diesels - what were they used on?

HI all,
Cummins engines were used about every were ,name it, trucks ,marine,generator,industriel of any kind.At theses times they were one off the biggest if not the biggest engines manufactureur of diesels engine in North America. HI Rodrigue.
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Old 09-29-2009, 08:58:21 PM
pegasuspinto pegasuspinto is offline
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Default Re: Cummins Models H and NH Diesels - what were they used on?

locomotives...
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Old 09-30-2009, 09:22:45 AM
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Default Re: Cummins Models H and NH Diesels - what were they used on?

14 litre straight-six diesel, used on a lot of UK independent trucks like ERF, Foden and others. Ford used the V6 and V8 Cummins in their larger D series trucks as well.

Got a book somewhere as well, we had a customer in the 1970's with a four wheeler truck and drawbar trailer that we used to look after.

Noisy as hell but very reliable, 180hp to 240hp, there was a turbo as well.

Peter
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Old 09-30-2009, 10:28:37 AM
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Default Re: Cummins Models H and NH Diesels - what were they used on?

Essentially, they are still being used-the N14 engine is still running in thousands of trucks & tractors....over 450 HP, electronic controlled.
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Old 09-30-2009, 06:10:34 PM
John Schwiebert John Schwiebert is offline
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Default Re: Cummins Models H and NH Diesels - what were they used on?

The model H engine was 4-7/8 by 6 same as a lot of old Macks 673 Cubic inch displacement. With the NH the bore was not large enough for the valves so the bore was increased to 5-1/8 inch 743 cubic inches if I remember correctly.
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Old 10-01-2009, 10:23:10 AM
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Default Re: Cummins Models H and NH Diesels - what were they used on?

The "classic" NH engines are 855 cu. in., 14 Litres, like the NT280, NT335, & so on. Without going out to the shop & getting my old Motor's Manual, I don't recall what model went from 743 to 855, as I remember, there was a "280" & a "big bore 280"...the old Emeryville IH that we had at the JD store had a big bore NT280, but everybody said it ran like a 335....I think it had been tweaked....
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Old 10-01-2009, 12:20:00 PM
John Schwiebert John Schwiebert is offline
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Default Re: Cummins Models H and NH Diesels - what were they used on?

The 855 engines have a 5-1/2 inch bore. They had a couple of older early engines called like the "Super 250" and I think there were a couple other sizes. They had a longer stroke. Without looking I think displacement was 927 cubic inches.
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Old 10-14-2009, 06:03:23 PM
larrysiebert larrysiebert is offline
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Default Re: Cummins Models H and NH Diesels - what were they used on?

I have a model 750 Versatile tractor with the original 855 from 1977 with 14000 hours on it and still going strong.
Larry
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