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From: (no name) (no email)
Date: Tue Aug 09 2005 - 08:10:49 EDT
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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