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Cummins 855 ?


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I'm thinking of doing a engine switch in a 300 hp articulated ag tractor I have. Current OEM engine is blown.

A friend installed an 855 Cummins small cam in an ag tractor he has.

Just wondering about the functional difference between a big cam and small cam 855. Which would be better? I'm engine knowledge challenged just trying to educate myself a bit. Also he suggested a Cat 3306 using a Steiger bellhousing. Which would be a better. Love to hear views from experience. Ag tractor operation around 2000 rpms constant rather than up and down like a truck seems to also be a factor. Any guidance appreciated

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Theakerstwo is right. You have to change the pump. Not a big issue. Cummins guys will know exactly what you need. A few years back I helped a buddy put an 855 in a 4586. Pretty simple swap. Ran the exhaust up the corner of the cab and put an outside air filter on off an r model. Also extended the front of the frame for the radiator.

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as cheap as they are now I would find a big cam 3 to put in it or a L 10 cummins swapped several in versatiles before not a fan of a 3306 in a tractor application its a constant load and will only live if you keep it 250 or less turn the screws and it wont make 400hours been there done that when they was brand new

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big cam or small cam wont matter in an ag tractor, if I remember my cummins history right the large cam was developed so the cam lobes were larger to stand up to the punishment that a jake brake placed on the lobes, so unless you have hills like we do out west, the need for a engine brake probably don't factor into what you need to do. typically the cummins guys are great at helping you repower a machine with their product. be it drive couplings, mounts, oil pans, flywheels, or housings, and fuel pump and timing issues.

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