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Reissued: August 1, 1986
2K7
CHART 7704. TROUBLESHOOTING (OIL TEMPERATURE INDICATORS)
Instrument fails to show Broken or damaged bulb. Check engine unit and
any reading. Wiring open. wiring to instrument.
Excessive scale error. Improper calibration ad- Repair or replace.
justment.
Pointer fails to move as Broken or damaged bulb Check engine unit and
engine is warmed up. or open wiring. wiring.
Dull or discolored marking. Age. Replace instrument.
EXHAUST GAS TEMPERATURE GAUGE (Alcor)
—CAUTION—
When replacing leads, it is very important to use the same type
and length of wire as the resistance of the leads is critical for the
proper operation of this gauge.
—CAUTION—
Attempts to lean the engine with a faulty EGT can result in
excessive cylinder head temperature or burned exhaust valves
The EGT gauge aids in selecting the most economical fuel-air mixture for cruising flight and determining
the proper fuel mixture setting at altitudes above 5,000 ft. It is a sensing device used to monitor exhaust
temperature. If it is found defective after checking on troubleshooting chart it should be replaced. If leads to
the gauge are defective in any way they should be replaced.
REMOVAL OF EGT PROBE AND GAUGE
1. Disconnect wires from EGT gauge at instrument panel.
2. Remove four bolts securing gauge to instrument panel and remove gauge.
3. Remove wires from wire harness going to engine.
4. Loosen clamp securing EGT probe to number two cylinder exhaust manifold and remove probe.
CLEANING AND INSPECTION OF EGT GAUGE
—CAUTION—
Do not connect ohmmeter across meter. It will burn out the
movement of the meter.
Unless mechanical damage is evident, broken glass, bent or broken pointer, or broken case, the following
checks should be performed before removing instrument from the panel:
TROUBLE CAUSE REMEDY
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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