Cylinder Head Temperature Gauge Troubleshooting - Piper PA-44-180 SEMINOLE Maintenance Manual

TEMPERATURE.
CYLINDER HEAD TEMPERATURE GAUGE.
The cylinder head temperature gauges are in their respective instrument clusters, located on the
instrument panel. These instruments measure cylinder head temperature using a sender located in a cylinder head
in each engine. The cylinder head used is determined by the engine manufacturer. This gauge is an electrical
instrument and is wired thru the instruments circuit breaker.
Each cylinder head gauge needle should be centered + 1/2 a needle width on the dot
with electrical power off. With 14 VDC applied to the system the gauge should
indicate approximately the known temperature. On a cold engine there should be a
drop of the needle.
TROUBLESHOOTING CYLINDER HEAD TEMPERATURE GAUGE.
Trouble
Instrument shows no
indication.
Instrument goes all the
way to upper stop.
REMOVAL AND REPLACEMENT.
Refer to the General section of this chapter under Removal of Cluster Mounted Instruments.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
CHART 7703. CYLINDER HEAD TEMPERATURE
Engine is cold.
Power supply wire open.
Defective sender.
Defective instrument.
Open circuit breaker.
Wire grounded between
sender and gauge.
Defective sender.
Cause
3H11
Remedy
Warm up engine.
Repair wire.
Replace sender.
Replace instrument.
Troubleshoot for fault.
Repair wire.
Replace sender.
7 7 - 2 1 - 0 2
Page 77-09
Revised: May 15, 1989