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Case 85xt 4-390 share with a 4bt?

Tomcat955

Member
Joined
Sep 12, 2021
Messages
15
Location
Illinois
So I’m helping a guy get a case 85xt running after his brother died and left it taken apart. Crank shaft rods pistons and who knows what else is missing. I here the engine is basicly a Cummins 4b but with a few variations. Can I swap a Cummins 4b in and swap over accessory’s etc?
 

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mitch504

Senior Member
Joined
Feb 27, 2010
Messages
5,776
Location
Andrews SC
yep, Case actually developed that engine series (3.9 and 5.9 liter) and licensed it to Cummins to manufacture.
 

jacobd

Well-Known Member
Joined
Apr 2, 2017
Messages
147
Location
North carolina
You can drop in a either a 4B or a 4BT but a 4B is naturally aspirated and will have significantly less horse power.
 

alrman

Senior Member
Joined
Jun 20, 2009
Messages
3,303
Location
QLD Australia
Occupation
Diesel Fitter;Small Business Owner;Cleaner
The 85XT was naturally aspirated & rated at 69HP.
If you bought another engine & it was lower or higher horsepower - you could fit the original injector pump to the newer engine, as that is what controls the HP.
Get the numbers off the injector pump & ask a diesel fuel injection shop to tell you the HP rating of the engine.
I wouldn't fit a turbo model as there would be some differences in intake & exhaust that would need modifying & add to the cost.

Would all the missing parts be at a local engine machine shop?
 
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