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Old 08-25-2008
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introduction, plus tachometer problem

HI!!! My nick name is beef, my real name is keith. I sail the lovely waters of lake Sakakawea ( 178 miles long, 4 miles wide in places, 1200 miles of bay filled shore line ) in North Dakota. I've been a Sailnet member for several months. This is my first post. Nice to meet you all. My problem is in the tachometer of my 1985 Yanmar 2GMF. May & June, tach working just right, July intermittent tach action,now nothing. I checked the tach needle mount, wiring etc. I think its the sending unit. Any comments, has anybody changed out one of the sending units? thanks for the help.
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Old 08-25-2008
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Are you certain there's a "pickup/sending unit"?.. many engines take the tach signal off the alternator.. When your tach quits check and see if you're actually still charging.. Could be as simple as alternator brushes.

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Old 08-25-2008
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thanks for the reply faster. The tach sending unit is mounted in the bell housing just above the starter just off the engine center line.
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