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Reissued: August 1, 1986
2K8
1. Remove probe from exhaust stack and check for a broken weld (at tip end) or a burnt off end. The
measured resistance of probe should be 0.8 ohms. Clean connections with steel wool before
reassembly.
2. Disconnect lead wires at instrument and measure. Resistance with lead wires connected to probe
should be 3.3 ohms. Clean connections with steel wool before reassembly.
—CAUTION—
Before heating probe, make sure adjustment screw on rear of
instrument case is in center of its travel. If screw is turned to
either end of full travel, no indication will show on pointer.
3. With leads connected to instrument, heat probe with a propane torch to a dull red. Meter should read
up to fourth graduation or approximately 1500°F.
4. If meter still does not read, replace it.
INSTALLATION OF EGT PROBE AND GAUGE
1. Install probe into hole in number two cylinder exhaust manifold and secure with clamp.
2. Route thermocouple wires along with existing wire harness to instrument panel.
3. install EGT gauge into instrument panel and secure with four bolts.
4. Connect thermocouple wires to rear of EGT gauge.
CHART 7705. TROUBLESHOOTING (EXHAUST GAS TEMPERATURE GAUGE) (ALCOR)
Gauge inoperative. Defective gauge, probe, Check probe and lead wires
or wiring. for chafing, breaks, or short
ing between wires or metal
structure.
Adjusting potentiometer Reset potentiometer.
turned off scale.
Fluctuating reading. Loose, frayed, or broken Clean and tighten con
electrical leads or faulty nections. Repair or replace
connections. defective leads.
CYLINDER HEAD TEMPERATURE GAUGE
The cylinder head temperature gauge is in the instrument panel cluster. It measures cylinder head
temperature using a sender located in a cylinder head. The head location is determined by engine manufacturer.
It is an electrical instrument and is wired through the instruments circuit breaker.
TROUBLE CAUSE REMEDY
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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