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Old 05 May 2012, 15:19   #11
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We had lots of steam from the exhaust with our inboard diesel, and we would occasionally overheat. Changed & checked lots of things, eventually found it was wear on the impeller housing cover. After replacing the impeller housing cover the amount of steam reduced dramatically.
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Old 06 May 2012, 04:30   #12
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Quote:
Originally Posted by chris.moody
We had lots of steam from the exhaust with our inboard diesel, and we would occasionally overheat. Changed & checked lots of things, eventually found it was wear on the impeller housing cover. After replacing the impeller housing cover the amount of steam reduced dramatically.
I looked at this and thought. Bollox. But actually this is feasible. If the exhaust elbow is starved of your cooling water this would happen. That's probably why we all have exhaust temperature alarms fittied
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Old 06 May 2012, 05:19   #13
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Country: UK - England
Town: Daventry & Beaulieu
Boat name: Tigga2
Make: Ribcraft 4.8
Length: 4m +
Engine: Honda BF50
MMSI: 235900806
Join Date: Jun 2011
Posts: 984
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Surprised me as well. In the fault finding we had:

Replaced impeller
Replaced thermostat
Checked pipes from water pump to thermostat for blockages
Checked exhaust for blockages
Replaced exhaust elbow

I was starting to run out of ideas, then inspected the impeller cover and it was very worn (from the rotation of the impeller spindle). Turned the impeller cover over so he worn side was now on the outside and no more overheating, much less steam, and greater water flow from the exhaust.

I was really not expecting the solution to be as simple as that, shame it took 3 months of overheating before I found the solution.

Chris
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