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Questions On Putting A K Series Cummins Where A Big Cam Was

Posted By 8v149Detroit Thursday, October 25, 2018 3:31 AM
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8v149Detroit
 Posted Thursday, October 25, 2018 3:31 AM
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Could I put a K in the place a big cam used to be without moving motor mounts?

What would you have to do about the accessory drive? Could I use the one off the big cam?

What about the radiator? Can I get one thats a few cores bigger? What about a aluminum radiator?

Anything else I need to worry about?
Geoff Weeks
 Posted Thursday, October 25, 2018 4:39 AM
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K has the same "foot print" of a NT, but it is taller. Everything else will be different. You'll nee the K's accessory drive, radiator fan and fan clutch (reverse rotation to a NT) The K uses 2 upper radiator connections IIRC. Check pan clearance on the front axle and tie rod. It is also heavier so that may cause problems with weight distribution on the truck.
Best to get a donor from the same truck it is going into and strip all the K only parts.
The K's I worked on were in equipment and not trucks, Only been around one that was in a Kenworth and never worked on it, it was in a O/O's truck.
Thursday, October 25, 2018 4:42 AM by Geoff Weeks
8v149Detroit
 Posted Thursday, October 25, 2018 5:34 AM
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I didn't know the accessory drive was reverse to a NT. I forgot about the two upper rad connections. Thanks Geoff, a big help as usual
Geoff Weeks
 Posted Thursday, October 25, 2018 10:00 AM
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I may be mistaken about the fan drive being reverse, I do remember something turning opposite on the K. I thought it was the fan drive but may be not. It has been 20 years or so since I worked on one.
Two-Books
 Posted Thursday, October 25, 2018 4:10 PM
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I drove a new A model KW in 1976 with a KT....if memory serves me right the firewall had a 3 or 4 inch indentation to accommodate the K. The engine bay was cramped to say the least. One photo she's parked in the yard and the other along the Alaska hyway.

For governments who try to tax themselves into prosperity is like standing in a bucket and trying to lift themselves up by the handle.
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Thursday, October 25, 2018 4:23 PM by Two-Books
junkmandan
 Posted Thursday, October 25, 2018 4:17 PM
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Definitely fan is gear driven and turns counter clockwise. I learned that in about '85 when I sold a customer a Kysor fiberglass replacement
Mclean
 Posted Thursday, October 25, 2018 6:07 PM
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Great pics
Geoff Weeks
 Posted Friday, October 26, 2018 2:19 AM
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junkmandan (10/25/2018)
Definitely fan is gear driven and turns counter clockwise. I learned that in about '85 when I sold a customer a Kysor fiberglass replacement
Dan, you put me to shame, You are alot older than I and have a better memory!
8v149Detroit
 Posted Friday, October 26, 2018 3:02 AM
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For any one that's drove one how does a kt 450 compare to a 444? Or a turned up 400?



And Geoff don't worry sometimes I go to the kitchen and forget why I went in there
Friday, October 26, 2018 3:04 AM by 8v149Detroit
Geoff Weeks
 Posted Friday, October 26, 2018 3:55 AM
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From what I remember, the KT450 had a tendency to crack pistons, may be they solved it, but when we were building them, we used higher Hp pistons, but left the pump set where it was.
With the bigger displacement the 450 would have more and broader torque then the 444. Fuel consumption was much higher on the K, top was around 4.5 when used in a truck and it went down from there.
If I were to build one, it would be to 600hp specs.
If you are going to build one, I hope you have deep pockets, everything for a K is many time what it costs for an NT
Friday, October 26, 2018 3:58 AM by Geoff Weeks

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