Next message: Mike Brasler: "Re: lv-ab: Erratic reading diesel Tiny Tach"
Seen most things, worked on a lot of weird diesels , please tell how this
injector line tacho pickup works?
Regards
Laura, Mike and Liz
http://www.seakin.com/gilana/default.htm
>From:
>To:
>Subject: Re: lv-ab: Erratic reading diesel Tiny Tach Date: Tue, 09 Aug 2005
>08:10:49 -0400
>
>
>
>
> TOTALLY NO NEED to conect INTO the injector line even with thick walled
>tubes fi you hold them with your fingers you can feel the
>pulses.....................so it prob uses some sort of sonic sensor that
>can measure these pulses...maybe the sensor is loose on the pipe ASSUMING
>it is not installed in the injector circuit BUT then we all know about
>assuming things......cant see why you would need to or want to start
>messing about with the injector circuits to meansure RPM when it is so
>easly done externally
>
>maybe the poster can tell us how TT works then maybe we can assist ;-)
>
>regards
>
>David
>
>-----Original Message-----
>From: Richard Goodwin <>
>To: Mark and Beth Mowery <>;
> Cc: Liveaboard <>; Hunter owners
>mailling list <>
>Sent: Mon, 8 Aug 2005 20:19:27 -0700 (PDT)
>Subject: Re: lv-ab: Erratic reading diesel Tiny Tach
>
>Wow, that blew my mind at first -- "a tach transducer
>attached to a fuel line" -- I couldn't figure out how
>that would work, but once you mentioned "injector",
>now I assume that the tach transducer is teed into the
>fuel line so it picks up on the surges in pressure
>when the injector is activated by the pump, yes?
>
>If that is the case, I would suspect that the tach
>transducer has been damaged by the high pressure (my
>engine's injectors are adjusted for 2100 lbs/sq-in).
>
>If the engine is running smoothly, then there isn't
>much else it could be, other than perhaps the
>electronics that "reads" the transducer's output and
>turns it into RPM readings.
>
>It certainly could be that, but I would suspect the
>part that is under the most stress first.
>
>Just a wild guess.
>
>Dick
>
>--- Mark and Beth Mowery <>
>wrote:
>
> > Hi,
> >
> > My diesel tach is 3 years old, and recently it's
> > been showing erratic rpm
> > readings when the engine is running at a constant
> > fuel setting. The
> > readings will vary for a while, then stabilize for a
> > while, then vary, etc.
> > The readings will vary by quite a bit (from 700 -
> > 2200 RPM) not the normal
> > small variations of 10 or 20 RPM I'm used to seeing.
> > The engine is a 2 cyl
> > Yanmar with a single tach transducer attached to one
> > of the fuel lines, and
> > has been working flawlessly until now. I did remove
> > the transducer, cleaned
> > under it, and reattached it, but this didn't help. I
> > really can't detect any
> > change in the engine's sound or performance during
> > these periods of strange
> > readings, so I ask the following question:
> >
> > In your experience, does this most likely indicate a
> > tach problem, or is it
> > actually possible that I have the beginning stages
> > of a malfunctioning
> > injector that the tach is picking up on?
> >
> > Mark Mowery
> > Owosso, MI
> >
> >
> >
> >
>
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