Manifold Pressure Gauge Troubleshooting; Tachometer Indicator - Piper PA-44-180 SEMINOLE Maintenance Manual

TROUBLESHOOTING MANIFOLD PRESSURE GAUGE.
TROUBLE
Excessive error at existing
barometric pressure.
Excessive error when
engine is running.
Sluggish or jerky pointer
movement.
Dull or discolored
marking.
Incorrect reading.
REMOVAL AND REPLACEMENT OF MANIFOLD PRESSURE GAUGE.
Refer to Chapter 34 and Removal of Face Mounted Instruments.
TACHOMETER INDICATOR (PA-44-180)
Each tachometer is connected to the engine accessory cover by a flexible cable and provides an indication of
crankshaft speed in revolutions per minute. The instrument has a recording mechanism for recording the time
that the engine is in actual operation. The right-hand tachomter has a reversing drive to correct for the counter-
rotation of the right-hand engine.
Tachometer P/N 62177-3 must be used with Hartzell Propeller HC-C2YK-
2CLGF/FJC7666A or HC-2YK-2CGF/FC7666A. For information on the electric
tachometer in the 180T refer to Chapter 61.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
CHART 7701. MANIFOLD PRESSURE INDICATOR
CAUSE
Pointer shifted.
Line Leaking.
Defective instrument.
Age.
Moisture or oil in line.
— Note —
Replace instrument.
Tighten line connections.
Replace instrument.
Replace instrument.
Disconnect lines and blow
out.
3H6
REMEDY
7 7 - 1 2 - 0 1
Page 77-04
Revised: May 15, 1989