cummins 250

G day help WANTED the outher day taking the Atkinson with a 250 cummins for a bit of a spin down the road it started to over heat, so with a few checks notice that ther is oil in the water but dusnt have water in the oil in the sump so with that flushed the radiator,block an removeing the thermostat housing , which was full of oil????

Sounds like the oil cooler is leaking

G'day Big A,

I'm with Fred!! sounds like your oil cooler.

The best way to check it is.

Remove both the sump & oil filter,
Pressurise cooling system. If coolant leaks out the filter head
It's your oil cooler.

If it leaks into the sump,
It's a liner problem....

I hope for yuor sake it's only the oil cooler,Much easier(&cheaper) to fix

ditto the above.......oil cooler.....most probably the oil cooler orings....but cld also be the element.
pull the cooler element and get it pressure tested.....while pulling the element pay big attention to the oil cooler orings....they are probably flat.....but should be round.
any radiator mob should be able to test the element.
and the reason its oil cooler is that oil pressure is 60lbs/sq" while water pressure in block is max 35lbs with a 12lb radiator cap so oil over-rides water when the cooler orings or element fails.
newto

Thank you to every one for ther comments i will start to pull things a part,i all so was told that if ther is diesel in the water its a cracked injector tube?

yep,diesel in rad is usually injector tube....but pretty rare to have both problems at once....fix the oil one first!

newto