Piper Cherokee Six Service Manual page 524

PIPER CHEROKEE SIX SERVICE MANUAL
c. 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
the instrument off and no indication will be shown on the pointer. If meter still does not read,
replace it.
CAUTION
Do not connect ohmmeter across meter. It will burn out the
movement of the meter.
9-82. INSTALLATION OF EGT PROBE AND GAUGE.
a. Install probe in the following manner.
1. Locate the hole for the probe in the exhaust stack of the number six cylinder. The
.129 inch hole is located 2.25 inches from the mating side of the mounting flange.
2. Carefully expand the clamp that the probe is mounted to and slide the probe
through the hole.
3. Tighten the worm clamp down to 45 in.-lbs. and safety wire.
4. Route cable back and up along the engine mount, and through the firewall where
the magneto switch wires go, keeping at least a minimum of 1 /2 inch lead wire to allow for
normal engine shock mount movement.
NOTE
On aft side of firewall make sure to provide clearance from
T-bar and rudder bar.
b. Install gauge in the following manner.
1. Insert the gauge into the instrument panel and secure with four bolts.
2. Connect the thermocouple wires to the back of the gauge.
Revised: 12/4/79 INSTRUMENTS
2L8