a4t Posted September 19, 2015 Share Posted September 19, 2015 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 Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/ Share on other sites More sharing options...
Mack Doctor Jr. Posted September 19, 2015 Share Posted September 19, 2015 Far as I know big cam means the main journals on the cam are bigger. I could be wrong I'm not a cummins guy. It should be a good swap though. Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304437 Share on other sites More sharing options...
theakerstwo Posted September 19, 2015 Share Posted September 19, 2015 Cummins would be a good engine if you would have the fuel pump changed to a varibable speed governor.The road governor like a truck uses would not be good at holding the speed constant. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304449 Share on other sites More sharing options...
Dirtymilkman Posted September 19, 2015 Share Posted September 19, 2015 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. Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304454 Share on other sites More sharing options...
bts-4120 Posted September 20, 2015 Share Posted September 20, 2015 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 Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304533 Share on other sites More sharing options...
gearhead204 Posted September 20, 2015 Share Posted September 20, 2015 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. Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304561 Share on other sites More sharing options...
Dirtymilkman Posted September 21, 2015 Share Posted September 21, 2015 I would like to see a E7 in a tractor. I don't know if anyone every did it. Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304582 Share on other sites More sharing options...
bts-4120 Posted September 21, 2015 Share Posted September 21, 2015 spoke with some mexicans that put a 237 in a 2670 case, talk about a ton of work to but a great motor into a total pos not a ag tractor but a jd 1050 dozer has a e7 Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304597 Share on other sites More sharing options...
David Posted September 23, 2015 Share Posted September 23, 2015 CAT = $$$$$$$$$$$$ Don't use a Big Cam IV low flow. Quote Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304838 Share on other sites More sharing options...
GreenGiant2 Posted September 23, 2015 Share Posted September 23, 2015 David, I was thinking the same thing but wasn't sure. Didn't want to show my stupidity . Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/41861-cummins-855/#findComment-304896 Share on other sites More sharing options...
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