About a month ago I replace the injector o-rings at the recommendation of a local diesel tech. When the injectors were installed again the truck's fuel economy went from 16 MPG to 5 MPG. Hauling 1,000 lb over 12,000 ft mountain pass was slightly less responsive, the trip was routine. Truck started and drove mostly norma.
I assumed the injector seals weren't doing their job so out came the injectors again and sent them off to Jim at Rosewood Diesel Shop
who was great to work with and very quick. Today I installed the injectors after meticulously cleaning inside the heads where the injectors seals seat (found some garbage in there.) To purge the oil/diesel from the cylinders I hand cranked the crankshaft 10 rotations with the valve covers on glow plugs out followed by kicked the engine over for 20 seconds on the starter. No unexpected resistance. This is when my discovery took place.
To get the truck started I needed to take the covers off and install the rest of the motor. When I pulled the covers off I noticed #2 and #4 had misted coolant on the inside of the valve cover.
Potentially it was only #2 and it then stucked into #4 then blew out the next stroke. WTF. Here is the question.
Why did coolant come out of any of my cylinders? Where could it come from?
No oil in coolant I see. Coolant reservoir is clean and green (flushed and reinstalled coolant within 5k miles.) No leaking on ground. No rust on dip stick but haven't drained oil to check that.
Tomorrow I will clean and reinstall the valve cover and check again. Then get a compression tester and check all the cylinders making sure they are withen 10% (5%?) Any other suggestions?
This truck hasn't exactly been what the PowerStroke community would call "awesome", if I am doing a head gasket I am going to be sick...and broke!
Any help and/or experience would be great.
1997 F250 Auto 4x4 233k miles