Tachometer Indicator; General; Troubleshooting; Removal And Replacement - Piper ARROW III Service Manual

10-47. TACHOMETER INDICATOR.

10-48. GENERAL. The tachometer is connected to the engine accessory by a flexible cable and provides an
indication of crankshaft speed in revolutions per minute. The instrument has a recording mechanism for
recording the time that the engine is in actual operation.

10-49. TROUBLESHOOTING.

Trouble
No reading on indicator
either permanent or
intermittent.
Pointer oscillates
excessively.
Indicator changes in
climb.
pointer goes all the way
to stop, more noticeable
in cold weather.
Pointer jumps at idle.
Tachometer cable breaks.
10-50. REMOVAL AND REPLACEMENT. (Refer to Paragraph 10-76 of this section.)
Revised: 2/13/89
CHEROKEE ARROW III SERVICE MANUAL
TABLE X-IX. TACHOMETER
Broken shaft
Loose cable connections.
Rough spot on, or
sharp bend in shaft.
Excessive friction in
instrument.
Excessive clearance in
speed cup.
Excessive lubricant in
instruments.
Speed cup hitting
rotating magnet.
Cable bent too sharply.
Cause
2G7
Remedy
Replace instrument.
Tighten cable.
Repair or replace.
Replace instrument.
Replace instrument.
Replace instruments.
Replace instrument.
Reroute cable.
INSTRUMENTS