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Old 12-06-2013
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Re: Yanmar 4JH-2E using coolant

Simple, cheap and effective way to check - put dishwashing soap in the coolant tank.

If you blow bubbles you have a leak in the exhanger.

Same thing works to make sure your impeller is working (if you have an under water exhaust) - soap the impeller - crank the engine and look for bubbles.
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