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Reissued: August 1, 1986
2K5
TACHOMETER INDICATOR
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 time that
engine is in actual operation.
CHART 7702. TROUBLESHOOTING (TACHOMETER)
No reading on indicator, Broken shaft. Replace instrument.
either permanent or in-
termittent.
Loose cable connections. Tighten cable.
Pointer oscillates ex- Rough spot on, or sharp Repair or replace.
cessively. 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 Excessive lubricant in in- Replace instrument.
stop, more noticeable in struments.
cold weather.
Pointer jumps at idle. Speed cup hitting rotating Replace instrument.
magnet.
Tachometer cable breaks. Cable bent too sharply. Reroute cable.
TROUBLE CAUSE REMEDY
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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