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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 07-12-2013
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Onan cooling problem

Having problem with a 5.5kva 2006 model Onan. Gathered from former owner all worked OK, recently serviced - heat exchanger serviced, coolant side of cooling system flushed through, impeller and belts changed - service engineers who have been doing this for 20 years cannot get coolant to circulate! Looked at all the obvious things again, impeller, thermostat, blockages incl mechanics cloths - run out of ideas. Any thoughts really appreciated please.
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Old 07-13-2013
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Re: Onan cooling problem

Buy a digital infrared heat gun. This will allow you to see any blockages.

Did you bleed the T'Stat?

Try removing thermostat and run without one. Drain coolant side. Then remove hoses from cooling reservoir. Use a garden hose with a cone shape spray nozzle, the old fashion kind, inserting the nozzle one of the coolant hoses. Turn on the water and it should come out the other hose without a problem. Then do the same thing in the other direction. Put everything back. Fill coolant side with water until you know everything is working fine, then you can drain and refill with coolant If you still have a problem your water pump may be the cause.

Isolate the pump as much as possible and try running water through it using the pump.
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Old 07-13-2013
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Onan cooling problem

Thanks. Will try that.
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Old 07-16-2013
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Onan cooling problem

The lads found that the coolant system was partially blocked with a jelly like substance -bit like wood glue - white colour. I have seen a post somewhere on this. They have never seen it before? Any thoughts?
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Old 07-17-2013
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Onan cooling problem

Head now off and jam packed full of jelly like material. Think it is the combination of salt water contamination of fresh water cooling system, no doubt some corrosion as a result of salt/aluminium, different coolants over years of cruising to distant parts and no doubt the overheating that resulted.

Hopefully now back on the way to being operational again.
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