Packard Forum Index » Post-War (1946-54)

It's a little unclear, especially with the long unbroken paragraph, to understand exactly what you're experiencing. It seems you're saying that you're losing coolant but not that you actually see it on top of the oil. If it's getting into the pan, it would show on the dipstick.

This one has really peaked my interest.

Did you check your oil after going for a drive? Was it milky, that is water and oil mixed? Or is the water migrating into the oil after the car is shut off?

And no while smoke out the tail pipe once warmed up, correct?

Could the block have a crack by one of the valve guides that opens up when the car gets warm, but doesn't show up during your pressure test? Maybe you could see evidence of water by removing your valve covers and inspecting your valve train?

BTW, I'm like Flackmaster, more armchair than mechanic. But I have been far enough into my engine (327) to have replaced valve guides, rings, coated pistons, cleaned and tested lifters, etc. etc.

Unsolved mysteries!