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Mariner 15 water pump seal

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Mariner 15 water pump seal

Postby the landshark » 07 May 2018, 17:11

I just did a lower unit refurb on my Mariner 15 4 stroke and found something unusual in the waterpump.
There does not seem to be a gasket between the pump housing, part number 29, and the wear plate, part number 27, neither is there one shown in the exploded diagram.
Am I going mad or is there a reason why mariner chose not to seal the pump body
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Re: Mariner 15 water pump seal

Postby Paul » 09 May 2018, 21:03

Sorry for the late reply mate ..... read it on my phone and forgot to reply when back home on the PC :shame
Yeah you're right, different manufactures do their own thing regarding the leg/gearbox despite shareing the same power head.
If the mating surfaces are in a good condition there shouldn't be a gasket required as the assembly is mated and immersed during operation :idea:
I think some manufacturers fit a gasket as a 'belt and braces' measure incase the surfaces are corroded :|
If the surfaces were corroded and a gasket isn't available then you could make your own from gasket material or apply a thin bead of marine silicone to overcome the issue :idea:
In your case I'd expect the components are of stainless steel, therefore corrosion shouldn't be an issue :|
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Re: Mariner 15 water pump seal

Postby the landshark » 11 May 2018, 09:44

Thanks for that. I reassembled it with a complete sierra pump kit because it was badly damaged by some ham fisted previous owner.
I'm more used to industrial pumps where any leaks are bad.
I just need to get a block anode and a new oil light and it should be good to go.
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