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Page 77 - 01
Reissued: August 1, 1986
2K4
GENERAL
POWER
MANIFOLD PRESSURE GAUGE
The manifold pressure gauge is a vapor proof, absolute pressure instrument. Pressure from the intake
manifold is transmitted to the instrument through a line. A pointer indicates manifold pressure available at the
engine in inches of mercury.
CHART 7701. TROUBLESHOOTING (MANIFOLD PRESSURE INDICATOR)
Excessive error at existing Pointer shifted. Replace instruments.
barometric pressure.
Excessive error when en- Line leaking. Tighten line connections.
gine is running.
Sluggish or jerky pointer Defective instrument. Replace instrument.
movement.
Dull or discolored mark- Age. Replace instrument.
ing.
Incorrect reading. Moisture or oil in line. Disconnect lines and blow
TROUBLE CAUSE REMEDY
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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