Manifold Pressure Gauge; Manifold Pressure Indicator; General; Troubleshooting - Piper ARROW III Service Manual

Trouble
Compass swings
erratically when
radio transmitter
is keyed.

10-43. MANIFOLD PRESSURE GAUGE.

10-44. GENERAL. 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.

10-45. TROUBLESHOOTING.

Trouble
Excessive error at
existing barometric
pressure.
Excessive error when
engine is running.
Sluggish or jerky
pointer movement.
Dull or discolored
marking.
Incorrect reading.
10-46. REMOVAL AND REPLACEMENT. (Refer to Paragraph 10-76 of this section.)
Revised: 2/13/89
CHEROKEE ARROW III SERVICE MANUAL
TABLE X-VII. MAGNETIC COMPASS (cont)
Normal.
TABLE X-VIII. MANIFOLD PRESSURE INDICATOR
Pointer shifted.
Line leaking.
Defective instrument.
Age.
Moisture or oil in
line.
Cause
Cause
2G6
Remedy
Remedy
Replace instrument.
Tighten line connections.
Replace instrument.
Replace instrument.
Disconnect lines and
blow out.
INSTRUMENTS