I did a cold system pressure test following the tester directions and pressurized the system to about 16 psi (the preset test point on the gauge) for a 13 psi system. I dropped about 1/2 psi over a 2 minute time period and repeated the test with the same results 5 times. I started up the truck and let it warm up to normal operating temperature and charged the system to 16 psi again. The instructions said that, if there was a combustion chamber leak, there would be a jumping gauge. There wasn't, and I dropped about 1/2 psi over a 4 minute period with the truck warm. I think this indicates that I have a slow leak between the water jacket and oil galley at the head since I can't find any external leaks. It also makes sense that the leak would slow when warm since the metal of the block and head are expanding and increasing clamping pressure on the gasket.
Does my reasoning make sense? I wonder if I can retorque the head and try to test it again. Thoughts?
As seen on Expedition with TX plates: VEGETARIAN - An old Indian word for poor hunter
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