Installation Of Egt Probe And Gauge; Cylinder Head Temperature Gauge; Troubleshooting (Exhaust Gas Temperature Gauge) - Piper Dakota Maintenance Manual

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.
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)
TROUBLE
Gauge inoperative.
Fluctuating reading.

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.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
—CAUTION—
CAUSE
Defective gauge, probe,
or wiring.
ing between wires or metal
Adjusting potentiometer
turned off scale.
Loose, frayed, or broken
electrical leads or faulty
connections.
2K8
REMEDY
Check probe and lead wires
for chafing, breaks, or short
structure.
Reset potentiometer.
Clean and tighten con
nections. Repair or replace
defective leads.
77 - 23 - 00
Page 77 - 05
Reissued: August 1, 1986