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Old 03 August 2015, 03:09   #1
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Country: Ireland
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Tohatsu 50HP 2 stroke engine alarm

I am getting an engine alarm, without associated oil light, when I start up my Tohatsu 50HP 2 stroke engine. The alarm stops after a few minutes but I checked the engine and there seems to be air in the oil lines attached to the filter. I am assuming the alarm could be associated with this but no oil light is a bit strange? Does anyone know an easy method to purge the oil system? Thanks.
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Old 03 August 2015, 04:19   #2
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You won't get the oil light illuminated as there's a low oil sensor housed in the reservoir. More than likely it's an electrical fault. Check the wiring in the remote if there's one fitted.

Did the oil reservoir run low?
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Old 03 August 2015, 06:43   #3
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Hi Sparticus, thanks for the reply. Oil level has always been high but a friend did unscrew the oil filter and we lost some oil that way! Will check electrics but pipes to and from filter have air in them!
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Old 03 August 2015, 10:08   #4
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Country: UK - Scotland
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Even if there was an air bubble in the oil pipe, I'm not convinced that would cause the problem. The system should be able to self purge. For peace of mind you could add oil to your next fuel tank. You're effectively double-dozing as the autolube is a mechanical pump that works in tandem with throttle. It'll smoke a little, but at least you know it's lubed.

The overheat sensor (which triggers the buzzer) is located next to the sparkplugs. Check the wiring, etc. The buzzer itself is in the remote throttle. A loose or oxidised bullet connector could give intermittent problems.
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