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I have ZF gears that are going to go behind B series cummins.

I was wondering if anyone could tell me if the cummins B series require an external oil cooler for the crankcase oil.

I have a brand new pair of oil coolers that I was going to use for the ZF Transmissions.

I am just a little confused about the engine oil needing cooling in addition to the transmissions. I know the cummins has an oil cooler mounted internally but is that enough?


Also, do the oil coolers need to be special since the ZF ar higher pressure than standard borg-warner style coolers?

No, the Cummins Bs all have an internal engine oil cooler and no external cooler is required. The ZF oil cooler needs to withstnd about 350 PSI. If in doubt on your new coolers have them tested at a radiator shop. The zf cooler goes in the seawater side of the cooling circuit.

UV

the cummins engine does not require a external oil cooler.but all zf trans require one.

Thanks guys.

I was not sure and I will test them at a radiator shop.

Only the oil side needs to be able to withstand the high pressure - the water side is low pressure directly from the output of the raw water pump, say maybe 10-20 psi.

UV