Oil cooler 3911940 Cummins 6BT, aftermarket

Oil cooler 3911940 is an aftermarket part for the Cummins 6BT engine.

The oil cooler transfers heat from the engine oil to the coolant and limits oil temperature under heavy load. It is a plate-type heat exchanger that may be combined with the oil filter mounting or the block side cover. An internal leak mixes oil and coolant: an oily film in the radiator, emulsion in the oil and coolant loss. As the signs resemble a head gasket failure, the cooler is pressure-tested. The cooler's internal passages are narrow and can clog with debris after an engine failure; replacement rather than cleaning is then advised. After replacing the cooler, watch the oil pressure and temperature during the first working hours. The cooler is supplied new. The cooler works under oil pressure. The cooler is made of metal.

Specifications

Compatibility

Other parts are in JCB Dieselmax engine.

Fitting

Fit the cooler with new gaskets or O-rings and tighten the bolts evenly. After the swap, change the oil and filter, flush, fill and bleed the cooling system, then run the engine and check the joints. Do not reuse the gaskets.