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Old 22-07-2010, 08:04   #1
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Location: Panama City, Panama
Boat: Hunter 42 Passage
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Transmission Thump Noise - Yanmar

I have a Hunter 42 with a Yanmar 4JH2-TE engine. The question is when I shift from neutral to forward there is a thump. The other direction from forward to neutral there is no noise. Same with reverse. I alway reduce the throttle when shifting.

Another question please. What size hose comes of the mixing elbow. 3 or 4 inch exhaust hose. Mine is original and wire inside beginning to rust meaning leakage. I am not near my boat so I can not measure myself.

Thanks James
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Old 25-07-2010, 15:20   #2
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Our previous boat had a Yanmar 3HM35. The boat was 1 1/2 years old and had a thump when the engine was turned off.

I always thought it was normal.

Several years later, I found a broken motor mount stud. I replaced it and the thump was gone.
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