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Old 22 May 2013, 16:40   #1
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Country: UK - Scotland
Town: Aberdeenshire
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Make: Ribcraft 4.8m
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Twatsoo overheat buzzer

I was out at the weekend (first trip of the season) on a fishing trip to Peterhead.

We launched at Cruden Bay, so roughly a 5 mile trip up the coast. I serviced the engine during the winter, stripped the carbs (no adjustment to the idle screws), replaced impeller, new gear oil, new sparks, new fuel, cleaned inline filter on engine and replaced water separating filter in console, cleaned thermostat and renewed gasket, etc.

The engine ran fine, but seemed to require extra choke and fast idle even after running. We weren't successful fishing, so headed down the coast and anchored in a bay. After restarting (and idling for 5 mins) while I stowed the anchor, the engine buzzer came on when put into forward. The sunlight was strong (to view the low oil warning light on the tacho) so I wasn't sure what the warning was for. I actually thought it was a low oil alarm. There was plenty oil - but rather than chance it with a possible Autolube fault, I added enough oil for what was left in the 25 litre tank. Worst case scenario it would smoke like an E Class frigate! Better that than seizing.

After opening up the throttle - the buzzer cleared. The tell-tale was normal. The Tohatsu normally pees like a horse!

What do you reckon? Take off the water jacket to investigate, or look at replacing an overheat sensor? Knowing Tohatsu the sensor will be the same price as plutonium on the black market. If I take off the jacket - it will require a new gasket, etc.

Engine is 2006 M60C 2-stroke. It's always flushed after use. The buzzer sounded briefly last season but cleared.
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Old 22 May 2013, 16:52   #2
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Country: UK - Scotland
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Picture of the bay we had lunch in... for no other reason than I love the picture. That's Sula moored in the background. The flag/pennant was washed up, probably off a marker bouy. Has hints of a US Cavalry flag though could have been held by John Wayne... or is that just me?
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Old 22 May 2013, 18:46   #3
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Possible thermostat is sticky... Be cheaper to test that in pot of hot water than either taking apart the head or replacing the plutonium bits.
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Old 22 May 2013, 19:19   #4
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I put those cheap 'tell tail' temperature label stickers on my engine blocks and head to give a true max temp .... May come in handy one day....
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Old 23 May 2013, 15:40   #5
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Thanks capnjack. I have a spare thermostat gasket, so will try it. Found this video on youtube. Not for an outboard, but they're exactly the same. Little treat at the end!

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Old 24 May 2013, 21:29   #6
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Outboard thermostats are more prone to premature failure than automobile ones, specially if engine is not flushed after use. The impecable thmo shown in the video works inside a radiator with glycol, not salt water and that makes a huge difference.

Happy Boating
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Old 25 May 2013, 19:51   #7
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The correct way to check a Tohatsu thermostat is as follows:

-Suspend thermostat and thermometer in a heat-resistant container filled with water, thermo must not be resting at bottom of container.

-Slowly heat and stir the water. Thermostat should open at140F [60C]. lf doesn't open at specified temperature, replace thermostat.

-Remove thermostat from container and observe its closing action as it cools. If closing action is not slow and smooth, replace thermostat.

Happy Boating
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Old 26 May 2013, 03:03   #8
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Cheers Loco. I removed the thermostat yesterday, cleaned it up and tested it. Thought it was slow at opening - so will replace as I have no confidence in it.
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Old 26 May 2013, 04:12   #9
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Hi

happy to supply a new one but if it sounds fine so can you call cameron on 01475 744215 and just check with him first.

Dave
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Old 26 May 2013, 08:23   #10
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Cheers Dave. Cameron sold me the engine back in 2010.

I have already sourced new thermostat, but didn't realise your website was as comprehensive as it is now so will definately keep you in mind for next time.
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