59A Flathead Water Pump Bolt Size?

[RalphM]

Originally Posted by Gusty59ab

Hello every body!

I Have installed a refurbished water pump in a 59ab with four stainlet steel fasteners but they seems to loose and the lock washers (grover ones) became flat.
I think that stainlet steel are not hard stress fasteners.

Another question: When you install a refurbished water pump is it necesary to run the engine with out water for a little 2 minutes in order to seat the seal?

Thanks!!
Gustavo from Argentina

I would not run it without coolant. If you have a good quality replacement water pump, it should not leak.