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Old 26 March 2023, 18:50   #1
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Country: UK - Scotland
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It pays to service the auxiliary engine

Serviced the engine on the rib including the auxiliary to get ready for the season. This Mariner auxilliary 4hp engine rarely gets used in anger. Its subject to salt spray and waves underway, but its always run in fresh water afterwards when I get home.

I used to do the impellers every 2 years, but will go back to every year on the auxiliary engine, on account of a build up of sea salt. The little impeller obviously struggles to shift it.

Might need to look at salt away solutions too.
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Old 27 March 2023, 22:22   #2
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Originally Posted by spartacus View Post
Serviced the engine on the rib including the auxiliary to get ready for the season. This Mariner auxilliary 4hp engine rarely gets used in anger. Its subject to salt spray and waves underway, but its always run in fresh water afterwards when I get home.

I used to do the impellers every 2 years, but will go back to every year on the auxiliary engine, on account of a build up of sea salt. The little impeller obviously struggles to shift it.

Might need to look at salt away solutions too.
Is that the yamaha badged mariner? If it is its quite common for them to corrode through the case below the water pump or for them to build up so much salt and corrosion they crack the gearcase. If its a Yamaha base engine its worth cleaning out below the pump regularly.

Sent from my SM-G950F using RIB Net mobile app
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Old 28 March 2023, 13:53   #3
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Also watch out for the water intake pipe at low level - had one corroded through. Think lack of anode and former keepers permamud berth didnít help much
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Old 28 March 2023, 17:43   #4
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Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
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Originally Posted by beamishken View Post
Is that the yamaha badged mariner? If it is its quite common for them to corrode through the case below the water pump or for them to build up so much salt and corrosion they crack the gearcase. If its a Yamaha base engine its worth cleaning out below the pump regularly.
No idea beamishken, I'd suspect it's a 90s 2-stroke going by the cowling decals. The serial number says it was built in Belgium as part of division of Brunswick Corporation.

I took the entire water-pump housing and integral drive-shaft bearing off and checked for wear and tear and there's plenty meat on it, but it is pitted when the salt was finally removed.

I last serviced it in 2021, but that's obviously too long. The impeller was fine, but the salt just builds up. The Tohatsu on the other hand was clean as a whistle.

Going forward I'm reverting back to every season on the auxilliary.
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Old 28 March 2023, 19:15   #5
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It pays to service the auxiliary engine

This is the inside of an aux engine I had in with an overheating problem. It was started every time he launched and thatís all the running it got.Click image for larger version

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