Join Date: Apr 2012
Location: Reed City MI. 49677
My thinking was two fold! With the water pump seal leaking I would think you would find coolant in the oil. The coolant system is pressurized to 12-16 psi, and the oil on the bottom end is not, so any leak would go from the higher pressure to the lower. On the head gasket, AC uses one of the bolt holes as an oil passage for flow to the cam. They use a MLG as a head gasket, and seal the bolt hole areas with a small O-Ring. Again the pressure differential lead me to this thought! The bolt hole that serves as an oil passage is close to the water jacket hole in the gasket. I use a coolant tester on mine for any head gasket concerns. Simple hand pump with a gage to pressurize the cooler system. I pump mine up to 10 psi, and let it sit for a few hours, if the pressure bleeds off I have a coolant leak somewhere (hose connections, thermostat housing, and other things) If it does not bleed off, I then start the motor and see if there is a rapid increase in the reading, again this will determine the head gasket is leaking. I found my pump on ebay for 24.00 dollars, and it saves me pulling many heads off! Most shops should have this tool, or maybe Auto Zone has one you can rent/borrow!