MF165 Diesel Fuel in Oil

tg in VA · Jan 30, 2014

I've got a 1968 MF 165 that has diesel fuel in the oil. Is this a simple fix (for a mechanic)or something major?

chuck41 · Jan 30, 2014

Hi tg, 9 times out of 10 it is the fuel pump.
Unbolt the pump/leave lines hooked up. Lay card
board down o'night and see if it leaks. Chuck

samn40 · Jan 30, 2014

Check also the thermostart on the intake manifold, it will have a wire and a diesel pipe attached. Unscrew it from the manifold and reconnect the wire and pipe, then run the tractor.....you will not need to plug the manifold hole for this test. If it is faulty it will drip.......Sam

Dieseltech · Jan 30, 2014

X 2 check the supply pump first. US 100 series tractors did not have the thermostart like the 35 50 65 and 85 models did. Last it can be the injection pump also, have been seeing these leak more than in the past. Most pumps I repair the seals get hard and brittle, and even crack and start leaking into the crankcase.

MF165 Diesel Fuel in Oil

tg in VA

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chuck41

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samn40

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Dieseltech

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