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-   -   Tachometer not working?? (http://www.sailnet.com/forums/gear-maintenance/11799-tachometer-not-working.html)

bderosa 06-27-2005 08:01 AM

Tachometer not working??
 
I have a westerbeke 40 and a westerbeke control panel. Few days ago the tachometer stopped indicating the RPM, however, it still keeps trach of the hours of operation.

Do I have to replace the tachometer or can it be fixed??

Any suggestiion will be greatly appreciated

Bill

marcberoz 06-30-2005 03:28 AM

Tachometer not working??
 
I recently had that problem on my Westerbeke 21. Hour meter worked & tach did not. Prior to my tach stopping, I had removed the alternator in order to do some engine work. The wiring that ran to my alternator ran thru a corrigated plastic tube. When I put everything together, I had not tucked the tube all the way back to its proper position. When I started the engine, everything worked fine. After about 1 hour underway, the tach stopped. What happened is that the plastic tube came in contact with the manifold & melted. This in turn damaged some of the wiring it contained. I replaced the damage sections of wiring & solved the problem. Your wiring may be similarly damaged or they may have some corrosion. Check that out 1st. Otherwise, the problem may be in the alternator itself.

bderosa 06-30-2005 06:22 AM

Tachometer not working??
 
Thank you, I will check it out and will let you know.

nhollystu 08-02-2006 11:17 AM

The signel that drives most tach's comes from the connection marked tach or has a sine wave marked next to it ~ it sends un rectified ac type voltage that the tach sees as rpms

camaraderie 08-02-2006 08:08 PM

When my alternator belt breaks...the first sign I have is that the RPM's drop to zero as the tach no longer gets fed. I know it sounds stupid...but check your belt if you haven't already! Otherwise it is likely the tach wire as indicated by the other posters.


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