Tach Generator Cessna 340

[[email protected]]

My RPM gauge does not show anything at startup on right engine. Then at
runup it comes to life at high RPM. Then after that it works fine. It
wobbles a bit sometimes in the air. My take is that my tach generator
is the problem. Any other ideas. Also do you know where to get a
replacement unit or overhaul?

[Mike Rapoport]

Are you sure that it even has a tach generator? If it does, it could be
either that or the guage. Try swapping things side to side until the
problem switches sides.

Mike
MU-2


> wrote in message
oups.com...
> My RPM gauge does not show anything at startup on right engine. Then at
> runup it comes to life at high RPM. Then after that it works fine. It
> wobbles a bit sometimes in the air. My take is that my tach generator
> is the problem. Any other ideas. Also do you know where to get a
> replacement unit or overhaul?
>

[Allen]

> wrote in message
oups.com...
> My RPM gauge does not show anything at startup on right engine. Then at
> runup it comes to life at high RPM. Then after that it works fine. It
> wobbles a bit sometimes in the air. My take is that my tach generator
> is the problem. Any other ideas. Also do you know where to get a
> replacement unit or overhaul?
>

Because of the location of the tach generator it is susceptible to getting
oil into the cannon plug connector. The first thing I would try is to undo
this connector, thoroughly clean and re-connect. If that doesn't help you
can try swapping sides as Mike suggests to determine if it is the generator
or the tach itself.

Allen