D. Cleaning and Inspection
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 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.
E. Installation
(1) EGT Probe
(a) Install probe into hole in number one cylinder exhaust manifold and secure with clamp.
Torque per Figure 1 and safety wire.
(b) Route thermocouple wires with existing wire harness to instrument panel.
(2) EGT Gauge
(a) Install EGT gauge into instrument panel and secure with four bolts.
(b) Connect thermocouple wires to rear of EGT gauge.
PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 2
Nov 30/06
5E2
77-20-00
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