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1953 Gray Marine 620 4cyl water pump

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » 1953 Gray Marine 620 4cyl water pump « Previous Next »

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Frederick Vare
New member
Username: 52atom

Post Number: 1
Registered: 06-2024
Posted on Wednesday, June 05, 2024 - 04:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am looking convert my grease cup water pump to the rubber impeller type. Does anyone know of how I can source one? Any leads appreciated
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miro forest
Senior Member
Username: miro

Post Number: 1254
Registered: 11-2001


Posted on Tuesday, June 18, 2024 - 06:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I wouldn't do that .
The rubber impeller pumps can lose the prime and the rubber impeller will elf destruct in less than a minute.
The trick with the gear type water pumps is to make sure that the ends of the gears and the housing is a very good and flat match.
The gear teeth can be worn down to sharp points but as long as the end parts are a close fit, the pump will work 100%

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