[C320-list] Intermittent Tachometer Operation

[Troy Dunn]

On the 3GM30F the sender is in the flywheel housing.   I suspect the same
is true for the 3YM30.   Try replacing the terminations with new and strip
back the wire 1/2” to confirm good copper before crimping on new heat
shrink connectors.

Troy Dunn
Hull #514

On Sun, Oct 1, 2023 at 3:50 PM Ferris Wills via C320-list <
c320-list at lists.catalina320.com> wrote:

> Hi,
>
> I had the same issue on my yanmar (hull 505) - There is a sender wire
> accessed from the back of the engine. After cleaning up that connection, my
> tachometer started reading nice and steady.
>
> Look in the yanmar manual to find the exact location of the sender.
>
> Ferris
>
> Typos by iPhone
>
> > On Oct 1, 2023, at 11:47 AM, Ian Neale via C320-list <
> c320-list at lists.catalina320.com> wrote:
> >
> > Hi,
> >
> > I have an 07 320 with a Yanmar 3YM30 engine.
> >
> > The tachometer is intermittent in operation where at times the needle
> goes back to zero while the engine is running.
> >
> > I think the tachometer runs off the alternator, but not sure. Wiggling
> wires on the back of the alternator doesn’t seem to fix the problem.
> >
> > I have also cleaned all connections in the back of the tachometer.
> >
> > Any suggestions as to what could be the problem.
> >
> > Thanks, Ian Neale.
> >
> > Solutions.
> >
> > Sent from. my iPhone
>