Oil in Coolant

[Allen Goodman]

Have a 966 that's getting oil in the coolant. Bought a new oil cooler and installed it. Ran the tractor to flush the cooling system for a half hour. Didn't clear up at all. Checked the oil level and I lost at least 3 quarts of oil. Any idea where the oil could be leaking into the coolant?

 

[SDE]

My guess would be a head gasket failure or a cracked head. The pressure created in the cylinders is greater than the pressure in the coolant system. But are you getting three more quarts in the coolant?

 

[Brownie450]

Could be the oil cooler.
Jim

 

[caterpillar guy]

You need to check your old oil cooler it may not have been bad. You will need to heat it as you pressurize it. Put a plate over the oil holes then in a tub of water heat the water with a torch or fire then add air pressure to the oil cooler your leak should show up. can check your new one the same way. I would suspect the new one is bad.

 

[Allen Goodman]

Brand new cooler.

 

[Allen Goodman]

At least 3 quarts within 30 minutes of run time. This tractor has sat for over 5 years without running. Got it from the widow (she's 98) of the original owner. That tractor was bought at the local dealership and spent it's entire time 6 miles away (3862 hours). I'm thinking the same, a head gasket, but it starts and runs great with no smoke.

 

[Donald in MN]

if you lost 3 quarts in that amount of time did the coolant level go up that fast?

 

[MikeinKy]

I had a tractor with the same symptoms. I put a dt414 from a 915 combine in it. Made a better tractor. You can buy combine engines a lot cheaper than repairing your old one. I now have a 986 with a bad engine and a junk 1440 combine with a good engine. I?m going to put that together this winter.

 

[Allen Goodman]

Pushed coolant out the overflow. Looked like a vanilla milk shake oozing out.