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Old 04-04-2021, 05:02 AM   #1
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Tacho failure

The tacho on my yanmar 6lpa has stopped. Strangely, however, the hour meter part is working as is the alternator. Any thoughts please?
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Old 04-04-2021, 06:14 AM   #2
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Don't know about the 6LPA but I know the 6LYAs tach is from a sensor on the engine bell housing. I would start with checking connections on back of tach if not done so already.
Mine was erratic last spring and it turned out to be corrosion on terminals / connectors to the sensor.

I have also read the sensor or spot on the flywheel can get dirty but the spacing is critical so don't just remove the sensor to check.
The procedure I read about but didn't have to use, was to gently screw the sensor in until it touched and count / record the turns / partials required. Then remove the sensor to clean or replace. Install using the reverse... in until gentle contact then back it out the recorded # turns.
Good luck & pls report back.
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Old 04-05-2021, 06:28 PM   #3
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Thank you Bacchus. Drew sensor and gave a wipe pretty clean though. Unlike blade connections. Bit of a clean up of connector blades and we are back in business��
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Old 04-05-2021, 06:33 PM   #4
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Old 04-05-2021, 08:59 PM   #5
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Thank y’all, bet that is my problem also,have been hitting with flip/ flop! Maybe you found the cure for me😎
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Old 04-07-2021, 03:32 AM   #6
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THEY ( you know the ones) had all assured me that tacho was driven by pulses from alternator! Now am one of the know alls, at least with this tacho. A wee dab of dielectric grease and good to go����
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Old 04-09-2021, 06:59 AM   #7
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Quote:
Originally Posted by silverback View Post
THEY ( you know the ones) had all assured me that tacho was driven by pulses from alternator! Now am one of the know alls, at least with this tacho. A wee dab of dielectric grease and good to go����
Alt is one (common) way of doing it but NOT THE ONLY ONE.
I think I found that in the Yanmar Service Manual.
Downloadable Copy posted/available in the TF Library Manual section
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Old 04-09-2021, 02:42 PM   #8
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Thank you
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