Thank you, Dave.

I am sure the o-ring is well compressed as I use the same procedure you use, with the exception that I have never used any grease, only some vaseline to facilitate the placement when compressing the pump.

I did the head gasket myself 3 years ago, it is all clean, so no oil spill.

I can try the RTV black, but will it be difficult to remove next time?

Regarding the gasket, I have always had a small leak from the bolt at the bottom, I also replaced the bolt, but still a minor leak.
Is there anything I could use to prevent this minor leak from the thread of the bolt?

Finally, the non-drying blue hypalon gasket sealer, any suggestion on the brand you use?

On another note, tomorrow I am flying to Richmond (BC), if I well remember you are in BC, but do not remember where :)

Thank you,
Alex