Piper Arrow IV Turbo Maintenance Manual page 657

GENERAL.
POWER.
MANIFOLD PRESSURE GAUGE.
The manifold pressure gauge is a vapor proof, absolute pressure type instrument. Pressure from the intake
manifold of the engine is transmitted to the instrument through a line. A pointer indicates the manifold
pressure available at the engine in inches of mercury.
CHART 7701. TROUBLESHOOTING (MANIFOLD PRESSURE INDICATOR)
Trouble
Excessive error at existing
barometric pressure.
Excessive error when en-
gine is running.
Sluggish or jerky pointer
movement.
Dull or discolored mark-
ing.
Incorrect reading.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Cause
Pointer shifted.
Line leaking.
Defective instrument.
Age.
Moisture or oil in line.
3F18
Remedy
Replace instruments.
Tighten line connections.
Replace instrument.
Replace instrument.
Disconnect lines and blow
out.
77-10-01
Page 77-01
December 1, 1978