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Old 05 September 2011, 15:39   #1
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Country: South Africa
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30 hp mariner making a humming/winding sound

Hi i have two 30hp mariner and the one is making a winding /humming sound but it only makes it under load. i did find water in the gearbox oil, could it be that the gearbox bearings are damaged or what else can it be.

thanks
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Old 05 September 2011, 16:20   #2
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I would guess it would be the gearbox, but always very hard to say without hearing it.
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Old 06 September 2011, 07:33   #3
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Can't be sure, but a quick way to help you in the right direction is to check the bearings: get a good grip on the propellor and try to rock it side-to-side.
Also; set the engine in neutral and try to spin the prop by hand . It should spin freely and without making any weird/ grinding sounds.
My 2 cents...
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Old 06 September 2011, 08:12   #4
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ave you check the starter motor
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Old 08 September 2011, 03:44   #5
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Thanks i will have it check out
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