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Old 05-06-2014, 01:00   #1
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Join Date: Oct 2012
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Advice please
Intermittent overheating of Bukh 28 hp
Johnson pump appears to stop pumping\afetr being off for a few hors
Possible air leak?
Checked everything from seacock to beyond pump
going fine again ,but worried re recurrence.
Could pump be worn internally and not generating enough lift?
Pumps out about 6 litres/min @ 900 rpm,cw specs for F 35 B-9
Overlooking something?

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Old 05-06-2014, 02:12   #2
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Location: Singapore
Boat: Moody 376
Posts: 135
Re: Overheating

I put a clear reinforced hose on our sea water intake so I could see if the pump had prime. It eventually transpired that the internal face of the pump was bumpy with wear. A new pump fixed the problem immediately.

This only took me a year to figure out!

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Old 05-06-2014, 02:14   #3
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Boat: warwick 44
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Re: Overheating

Replace the impeller, it should be done annually
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Old 05-06-2014, 03:15   #4
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Re: Overheating

If its similar to the Bukh I owned years ago the water pump is integrated into the engine and if the seal goes behind the pump you have salt water in your oil.
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Old 05-06-2014, 03:26   #5
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Location: Toronto, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
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Re: Overheating

An Aqualarm raw water flow detector for about $65 will give instant notification of raw water flow stoppage. I wouldn't run my diesel without one.
That hysterical laughter you hear as you sail a way in your "new" boat ..... is the seller.
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Old 05-06-2014, 05:07   #6
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Location: North Carolina
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Re: Overheating

On this engine which is raw water cooled, I would check that the water passages around the thermostat are clear and that the thermostat is actually working properly. If it doesn't open fully at the correct temperature, the engine will overheat.

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heating, overheating

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