Hi all,

My son and I just rebuilt a '99 4.6L motor. A complete overhaul.

After running the motor for 15-25 minutes, I removed the oil filter and discovered a milky substance as I emptied it. I emptied the oil pan and found more water in the oil.

We removed the oil pan and did a coolant system pressure test, but didn't see any coolant coming from the bottom of the engine.

Is there anywhere other than the head gaskets where the 2 can mix or is this a normal occurrence during the break in period? The truck has not been driven anywhere yet.

I did not replace the head bolts with brand new. They were torqued properly tho.

Thank you,
Ed

 

If you pressurized the cooling system and didn't get any results, that is a head scratcher.

This is not normal at all, break in or not.

Can you pull the valve/cam covers and pressurize the system again? Make sure it's full etc.

Could be the head gaskets, could be a crack somewhere.