Piper SARATOGA PA-32-301 Maintenance Manual page 541

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
EXHAUST GAS TEMPERATURE GAUGE (ALCOR).
This instrument, which is commonly referred to as EGT, is used to aid the pilot in selecting the economical
fuel-air mixture for cruising flight as power setting at 75% or less. It is a sensing device to monitor the fuel-air
mixture leaving the engine cylinders. This gauge is adjustable. If it is found defective after checking with
troubleshooting chart, it should be replaced. If the leads to the gauge are defective in any way, they should be
replaced. 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.
On PA-32-301T models the EGT probe is mounted in the exhaust transition area.
REMOVAL OF EGT PROBE AND GAUGE.
1. Disconnect wires from the EGT gauge at the instrument panel.
2. Remove four bolts which secure the gauge to the instrument panel and remove the gauge.
3. Remove wires from the wire harness going to the engine.
4. Loosen the nut or clamp which secures the EGT probe to the exhaust system and remove the probe.
CLEANING AND INSPECTION OF EGT.
Unless mechanical damage is evident, broken glass, bent or broken pointer, or broken case, the following
checks should be performed before removing the instrument.
1. Remove probe and check for broken weld (at the tip end) or burnt off end. Measured resistance of
probe should be .8 ohms. Clean the 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.
3. With leads connected to instrument, heat probe with propane torch to dull red. The meter should read
up to the fourth graduation or approximately 1500°F. Before making this check, make sure that the
adjustment screw, which is located in the rear of the instrument case, is in the center of its travel. If this screw
has been turned to either end of full travel, it will shut instrument off and no indication will be shown on the
pointer. If meter still does not read, replace it.
77-20-04
Page 77-04
2L10
Issued: January
2, 1980