I have a 2GM20 Yanmar in a Hunter 28.5. I'm getting a bad vibration on acceleration once the engine warms up. It doesn't vibrate in neutral or reverse at 2500 RPM ! It doesn't vibrate to when the motor is cold. Only motor warm and in foreward, beginning at 1500 RPM This thing is vibrating very badly. Please Help.
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Bad vibrations
Hi Alain. Since the engine is always turning in the same direction I suspect that you either have one engine mount that is bad or the transmission is acting up. If one motor mount is bad it will allow the engine to rattel around while in forward (the most used direction) but when you shift into reverse the other (preseumably good) mount holds the engine aginst the reversed torque. Look at both mounts while somebody shifts the gears. If both look the same then suspect a transmission that needs work. Check the input and output shafts for movement parallel to the shaft axis. AND have fun standing on your head while in that phonebooth engine room while doing it ;-) Bill Roosa
Hi Alain. Since the engine is always turning in the same direction I suspect that you either have one engine mount that is bad or the transmission is acting up. If one motor mount is bad it will allow the engine to rattel around while in forward (the most used direction) but when you shift into reverse the other (preseumably good) mount holds the engine aginst the reversed torque. Look at both mounts while somebody shifts the gears. If both look the same then suspect a transmission that needs work. Check the input and output shafts for movement parallel to the shaft axis. AND have fun standing on your head while in that phonebooth engine room while doing it ;-) Bill Roosa
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