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| 1969 AMX Water Pump |
In today's school of hard knocks, I learned to test-bolt a rebuilt pump with the gasket before permanently installing with gasket sealer. Torque the bolts and then test spin the pump with your hand. It is a common problem with AMC rebuilt water pumps for the impeller to scrape against the timing chain cover after fully tightening the bolts. You will easily hear and feel if it does scrape. This occurs because the pump rebuilder trued the mating surface and removed metal critical to the proper clearance.
The solution is to try a thicker gasket, or more commonly just double up on the gasket. I wound up doubling-up the gasket, using 1 thin plus 1 thick gasket.
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