Yanmar 4jhe tachometer issues

[malbert73]

Does anyone know what the tachometer on my Yanmar 4jhe takes off from on the engine? It's working intermittently, and I checked for loose connections at the panel. It's working about 1/3 of the time right now.

I am thinking maybe a loose connection on the engine but don't know where to look.

Thanks!


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[desodave]

The tach on my 3JH4E is off the back of the alternator

[model 10]

Just for grins, see if it works with no load at all. If it doesn't I hear it's not uncommon. Turn something on and it might work again.

[boatbod]

You either have a 2 terminal sender on the bell housing reading flywheel teeth, or a connection to the stator output of the alternator.

Until you figure out which it is, it's hard to diagnose accurately.

[a64pilot]

My 4JHE does not use the alternator.
I am not sure but think a speed sensing monopole on the bell housing like has been said

[malbert73]

Makes sense if it's on bell housing, especially since I removed transmission for rebuild this winter so probably loosened a connection on reinstall
Thanks everyone!

[Cabo Jim]

Sounds familiar, I had a similar problem and discovered a loose wire connection on the wire from the back of the alternator to the Balmar MC 614 regulator. 90% of all electrical problems are a result of poor connections.
Cabo Jim

[captain mitch]

Ahhh, don't forget that the alternator will stop feeding the tach when the solar panels have charged the batteries enough to shut down the alternator.
I was suprized after my first solar panel install.

[Calif.Ted]

Found this old thread that has photos of a tach sensor on the bell housing as used on the GM series also.
http://www.cruisersforum.com/forums/...h3e-23223.html

[malbert73]

Thanks everyone. It's a sensor on bell housing right above starter on 4jhe. Took off connectors, sprayed terminals, put back on- all fixed!!


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[boatbod]

Loose connections is by far the most common issue on those senders.

[ktmissouri]

I will make this the first post I have made on this site. The above thread pointed me in the right direction and helped me find the loose/corroded connections on the sender. Thanks!

[Wotname]

Welcome aboard ktmissouri, nice first post and it's good to see that CF has helped you out. Thanks for the feedback.

[GordMay]

Greetings and welcome aboard the CF, ktmissouri.