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Old 06-09-2019, 07:57   #16
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Re: Yanmar 3GM30F not making full power

It was the exhaust elbow. No black smoke so I kept going over the fuel system—plus that is easier—like the drunk looking for his car keys under the lamppost because the light is better. At least I got some of the 32 year old fuel line replaced. But replacing the exhaust elbow cured the problem. The old one didn’t look too plugged up from what I could see peering into it. The shop man that I paid to get it off the manifold actually had to cut it in half to get good leverage with his wrench—revealing severe restriction right in the bend. Know a bit more about my engine now.
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Old 06-09-2019, 15:49   #17
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Re: Yanmar 3GM30F not making full power

Thanks for the update, it really helps others when the final culprit is revealed.
Well done for getting it fixed.
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