Next message: Mike O'Reilly: "TWL: RE: Re: Fuel Tank Polishing & Alpha-Laval"
In a message dated 9/3/03 12:03:29 AM,
writes:
<< I'm assuming the input for the tachs is the engine take-off
variety. Can anyone enlighten me as to how this works, and how it it
might be causing the new tachs to drop out at low rpm? >>
Rob,
The tach takeoff on most diesel engines is basically a gear driven rotating
element with a fitting to take the squared off tang of a flexible shaft. For
mechanical tachs the rotating flexible shaft spins a magnet which moves a spring
tensioned needle to indicate RPM. It's just like your car speedometer only
calibrated differently. If you fit an electrical tach, you remove the flexible
shaft and substitute an electrical sender. This consists of either a switch or
a magnetic pulse generator. The tach simply uses the electrical pulses to
indicate RPM. If the manufacturer is cheap, it uses the alternator as a pulse
generator. Trace the wires from the tachs to see where they are going. This
should tell you if the alternator or a sender is producing the electrical pulses.
Larry Z
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