Posted by Steve@Advance on October 19, 2020 at 19:48:23 from (66.169.147.211):
In Reply to: Chat posted by Chris Ford on October 19, 2020 at 19:01:39:
It's very likely it is the head gasket.
What is happening is oil laden compression gasses are entering the coolant on a microscopic level. The oil accumulates over time and eventually shows up in the top of the radiator.
Does this have studs or bolts? If it has bolts, a set of studs will offer a higher pressure on the head gasket as they have fine threads on the nut end. If it has studs, remove them to properly clean, and for peace of mind replace them unless they were recently installed new.
Clean the block thoroughly, down to bright metal. Chase the holes with a tap. Go ahead and surface the head to clean up, even though it checks good.
Use a very thin sealer or aluminum spray paint on the new gasket. Seal the stud threads in the block with aviation sealer. Use hard washers under the nuts (they should come with the stud kit), light oil on the threads. Torque the nuts to 55 ft lbs. When up to temp, retorque the nuts. Slightly back each nut off just enough to feel it move without relieving the down pressure, then take to 55 again.
That should seal everything up. Might want to flush the cooling system with Dawn. Let the Dawn circulate with just water, try to float the oil up and out of the radiator. Flush it a few times, see if the oil is gone before flushing and draining, then add antifreeze.
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