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

Discussion in 'Skid Steers' started by Tomcat955, Jul 2, 2022.

  1. Tomcat955

    Tomcat955 Member

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    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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  2. mitch504

    mitch504 Senior Member

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    yep, Case actually developed that engine series (3.9 and 5.9 liter) and licensed it to Cummins to manufacture.
     
  3. Tomcat955

    Tomcat955 Member

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    Do you know what parts are shared vs what’s different? Can I buy a 4b and drop it right in?
     
  4. mitch504

    mitch504 Senior Member

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  5. jacobd

    jacobd Well-Known Member

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    You can drop in a either a 4B or a 4BT but a 4B is naturally aspirated and will have significantly less horse power.
     
  6. alrman

    alrman Senior Member

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    QLD Australia
    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?
     
    jacobd and Tomcat955 like this.