wesalexleft
Well-Known Member
- Joined
- August 2, 2009
- Messages
- 148
- Reaction score
- 2
- City, State
- Memphis, TN
- Year, Model & Trim Level
- 2003 Mountaineer V8 4.6L
I'm getting coolant in my oil on a 4.6L Mounty with very little pressure loss at the degas bottle. Pumped the coolant tank to 15LBS and lost 2 lbs in about two hours, but it stabilizes after that. Repeated for almost 24 hours, and lost around 1/2" of coolant from the degas tank. I started the engine for a few minutes, checked the oil, and coolant was present. I've since changed the oil and now looking for the source. Compression tested with a piece of crap loaner guage, but after 5 cycles on each cylinder with a hot engine, all cylinders read 150-165 PSI. The guage leaked down quickly though on all cylinders, so I think the valve is leaking on the compression tester. There is NO coolant externally that I have found, and I've run dye in the coolant.
Tomorrow I'll do a leakdown test, but the engine is going to be cold, will that make a difference?
I've also done a combustion gas test at the degas bottle and ther are no combustion gases present.
If the leakdown test passes, what would be the next places to look?
I've considered a freeze plug behind the timing cover, the oil adapter/cooler, and it could still be intake gaskets even though those were replaced last fall due to a coolant leak externally.
Also, could all this still be head gasket or block related with no combustion gases or oil in the coolant, good compression, and a satisfactory leakdown test?
Sorry for all the questions, but I'm stumped and want this fixed. It's my sons college truck and he's home over summer break.
Tomorrow I'll do a leakdown test, but the engine is going to be cold, will that make a difference?
I've also done a combustion gas test at the degas bottle and ther are no combustion gases present.
If the leakdown test passes, what would be the next places to look?
I've considered a freeze plug behind the timing cover, the oil adapter/cooler, and it could still be intake gaskets even though those were replaced last fall due to a coolant leak externally.
Also, could all this still be head gasket or block related with no combustion gases or oil in the coolant, good compression, and a satisfactory leakdown test?
Sorry for all the questions, but I'm stumped and want this fixed. It's my sons college truck and he's home over summer break.