10-55. TACHOMETER INDICATOR.
10-56 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
10-57. TROUBLESHOOTING.
TABLE X-VIII. TACHOMETER
Trouble
Cause
Remedy
No reading on indicator either
Broken shaft.
Replace instrument.
permanent or intermittent.
Pointer oscillates excessively.
Loose cable connections.
Tighten cable.
Rough spot on, or sharp
Repair or replace.
bend in shaft.
Excessive friction in
Replace instrument.
instrument.
Indicator changes in climb.
Excessive clearance in
Replace instrument.
speed cup.
Pointer goes all the way to stop,
Excessive lubricant in
Replace instruments.
more noticeable in cold weather.
instruments.
Pointer jumps at idle.
Speed cup hitting
Replace instrument.
rotating magnet.
Tachometer cable breaks.
Cable bent too sharply.
Reroute cable.
10-58. REMOVAL AND REPLACEMENT. Refer to Paragraph 10-87 of this section.
10-59. ENGINE OIL PRESSURE GAUGE.
10-60. GENERAL.
The oil pressure gauge is mounted in the cluster on the instrument panel. This gauge will indicate the
amount of oil pressure available at the pressurized engine oil passage.
10-61. ENGINE OIL PRESSURE GAUGE CALIBRATION. A calibration chart has been included for use in
verifying that the suspect faulty gauge is within tolerance.( Refer to Figure 10-4 .)
—Note—
Actual recalibration of the gauge must be preformed by the
manufacturer or an approved instrument repair facility
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
I N S T R U M E N T
2C4