Got 2 06 C7's Thomas buses with blowby coming out the vent tube 1 has coolant in the oil/crankcase the other oil in the radiator they run fine just the blowby..oil cooler issues?? Any help Thanks...
This sounds like oil cooler issues. Pull both coolers out and pressure test em. I have used a piece of 1/2 plate steel and drilled all the bolts holes out and install an air fitting to feed the oil side of the cooler, mount the cooler to it and put an air hose to. I wouldnt go over 80 or 90 psi. Then drop it in a bucket of water. Ive always done that just to verify the cooler is leaking.
normally if an oil cooler is bad it will fill radiator with oil, as the oil pressure is higher than cooling system pressure. sounds like 1 with possible cooler issues The one with coolant in the crankcase, might be cooler problems but I would be more apt to think it's problem is somewhere else, myself.
cking both coolers would tell you whether there bad or not.
C7 Blowby
Posted - 10/25/2012 : 4:05:11 PM
