A friend of mine has the same Yanmar 2GM20F diesel engine that I have and his Tachometer has stopped working. Any suggestions of what to check first & next? Any input would be helpful. Thanks
Tachometer not working on Yanmar 2GM20F
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Tach
I've got a 2GM20F in my C&C 26.
When mine stopped working it turned out to be a bad connection.
The tach picks up the revs from the flywheel housing on the back of the engine.
Check that the wire hasn't become disconnected.
sam
I've got a 2GM20F in my C&C 26.
When mine stopped working it turned out to be a bad connection.
The tach picks up the revs from the flywheel housing on the back of the engine.
Check that the wire hasn't become disconnected.
sam
Clean the connections on the sender and crimp them down a little on the female ends. slide them back together and it should work. I just fixed mine yesterday, and it now works. It hasn't worked for five years. The sender is on top of the flywheel housing on the right side of the motor if it's like mine. There's two wires.
Dave
Dave
Most common reason for a Yanmar Tachometer not working is corrosion of the pointer bearings. With the 'ignition switch' in the 'on' position and the engine running at well above idle speed, 'rap' the rim of the tacho with a hard plastic item - usually moves the tacho needle sufficient for it to move to the correct position. If not, then look for electrical issues. This has been a problem with stock Yanmar Tachometers since the early 1980s and continues through the present day.
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