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Old 21-06-2016, 14:33   #1
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Engine driven bilge pump squeals loudly

Hi All,
Our emergency bilge pump is belted onto the engine with an electric clutch. A Jabsco 50200-2311.

I tried to use it a few days ago and it squeals super loud. It also didn't appear to work, but maybe that's because I had the (very complicated) bilge selection valves setup wrong.

I assumed the impeller was busted, but just checked it and it is fine. I confirmed it spins by engaging the clutch for half an instant with the cover plate off. The cover plate has a generous amount of salty bronze crud build up, which I am cleaning off now with a vinegar soak.

What's the most likely cause of this noise -- the bearing?

Thanks!

Matt
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Old 21-06-2016, 15:19   #2
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Engine driven bilge pump squeals loudly

For an emergency bilge pump the noise is secondary. In a real emergency the pump is water lubricated anyway 😀


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Old 21-06-2016, 16:31   #3
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Re: Engine driven bilge pump squeals loudly

Are these belt driven pumps generally loud? I want it to work well if I need it, and am guessing the squealing means there's something wrong with it? Is it ghetto to spray WD40 on the bearings?
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Old 21-06-2016, 17:11   #4
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Re: Engine driven bilge pump squeals loudly

Could it be belt slipping?

Jim
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Old 21-06-2016, 17:37   #5
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Re: Engine driven bilge pump squeals loudly

Squealing is usually the belt. Rarely a dry pump. I use water proof grease on the impeller housing (anywhere the impeller rubs) whenever I have them open (about once a year). My impellers on 2 mains, 2 generators and 2 engine driven bilge pumps all were replaced in 2011. Still look and work fine. About 500hrs/yr. on the mains and 1/2 that on the generators. Bearings are usually bronze bushings and made to water lubricate. Better, bigger pumps use sealed pre-lubed roller bearings.
WD-40 has very little lubrication properties. WD stands for water displacement. It came about after a Texas hurricane to get water out of electric equipment.
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Old 21-06-2016, 19:02   #6
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Re: Engine driven bilge pump squeals loudly

Oh, good idea, thanks guys! I will try tightening the belt...
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Old 22-06-2016, 10:01   #7
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Re: Engine driven bilge pump squeals loudly

If belt is glazed or age hardened ,tightnening may not help much. Replace as part of maintenance and peace of mind.
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Old 22-06-2016, 10:46   #8
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Re: Engine driven bilge pump squeals loudly

Squealing is usually the belts slipping. You can buy a spray can of anti belt slip which is very effective and should always be in your toolkit.
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Old 22-06-2016, 14:20   #9
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Re: Engine driven bilge pump squeals loudly

Make sure outlet is clear. Often these pumps will squeal if they are running dry--or if the inlet is blocked.
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