Piper ARROW III, Service Manual

Page: 429 / 594

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