Zenair CH2000 - Tachometer Operation; Engine Oil Pressure Gauge

ZENAIR CH2000 SERVICE MANUAL
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 TACHOMETER
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.
TROUBLESHOOTING See following table:
TACHOMETER
Trouble
Cause
Remedy
No reading on indicator, either
permanent or intermittent.
Broken shaft.
Weak spring.
Replace.
Replace instrument.
Pointer oscillates excessively.
Rough spot on, or sharp bend
in shaft.
Excess friction in instrument.
Repair or replace.
Replace instrument.
 ENGINE OIL PRESSURE GAUGE
GENERAL
The oil pressure gauge is mounted in the cluster on the instrument panel. This gauge will indicate
the amount of oil pressure in PSI available at the pressurized engine oil passage.
TROUBLESHOOTING
ENGINE OIL PRESSURE GAUGE
Trouble
Cause
Remedy
Excessive error at zero.
Pointer loose on shaft.
Overpressure or seasoning of
bourdon tube.
Replace instrument.
Excessive scale error.
Improper calibration
adjustment.
Replace instrument.
Excessive pointer oscillation.
Improper damping or rough
engine relief valve.
Disconnect line and drain.
Check for leaks. If trouble
persists, clean and adjust relief
valve.
Sluggish operation or pointer
or pressure fails to build up.
Engine relief valve open.
Check and clean.
3 Apr 95 9.5