Piper SARATOGA PA-32-301 Maintenance Manual page 538

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
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
Cause
Remedy
Excessive error at existing
barometric pressure.
Excessive error when en-
gine is running.
Sluggish or jerky pointer
movement.
Pointer shifted.
Line Leaking.
Defective instrument.
Replace instruments.
Tighten line connections.
Replace instrument.
Dull or discolored mark-
ing.
Age.
Replace instrument.
Incorrect reading.
Moisture or oil in line.
Disconnect lines and blow
out.
77-10-01
Page 77-01
Issued: January 2, 1980
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