I checked the coolant in the radiator for oil residue floating on top and found none.  The radiator was completely full with no air.  I removed a plug from each rotor and turned the engine over looking for water coming out of the plug holes…nothing.  It appears to me that the o-rings are not failed and the high coolant pressure is not coming from a leak from the combustion chambers.

 

I have located a borescope and I plan to inspect the inside of the radiator tank on the inlet side.  I also plan to remove the water pump and inspect as far inside the coolant passages as I can see looking for an obstruction.

 

Do I need to replace the gasket on the water pump when I reinstall it?  Do I need to use any sealant?  What say ye who have removed/replaced water pumps?

 

If the o-rings are ok and if I don’t find an obstruction, any other ideas as to the cause of the high water pressure??

 

What about any suggested tests???

 

Bill B