Cessna 188 Series Service Manual page 223

MODEL 188 & T188 SERIES SERVICE MANUAL
IIB-10.
TROUBLE SHOOTING (Cont).
TROUBLE PROBABLE CAUSE REMEDY
FUEL PRESSURE DECREASES Compressor discharge pressure Check and clean out rcstrictions.
DURING CLIMB. WHILE MANI- line to fuel pump aneroid
FOLD PRESSURE REMAINS restricted.
CONSTANT.
Leaking or otherwise defective Replace engine-driven
engine-driven fuel pump fuel pump.
aneroid.
ABNORMAL MANIFOLD Leak in intake system. Check for cracks and other
PRESSURE DECREASE DURING obvious defects. Tighten all
CLIMB AT ALTITUDES BELOW hose clamps and fittings.
NORMAL PART THROTTLE Replace defective components.
CRITICAL ALTITUDE
Leak in exhaust system. Check for cracks and other
obvious defects. Tighten all
clamps and fittings. Replace
defective components.
Overboost Valve Replace Valve
Defective
Intake air filter obstructed. Service air filter.
Refer to
Section 2 for servicing
instructions.
Improperly adjusted wastegate Adjust wastegate. Refer to
paragraph 11B-55.
FUEL FLOW DOES NOT DE-
)efective engine-driven fuel
Replace engine-driven fuel
CREASE AS MANIFOLD
pump aneroid mechanism. pump.
PRESSURE DECREASES AT
PART-THROTTLE Obstruction or leak in compressor
Check for leaks or obstruction.
CRITICAL ALTITUDE.
discharge pressure line to engine-
Clean out lines and tighten
driven fuel pump. all connections.
FUEL FLOW INDICATOR
Moisture freezing in indicator Disconnect lines, thaw ice and
DOES NOT REGISTER line.
clean out lines.
CHANGE IN POWER SETTINGS
AT HIGH ALTITUDES.
SUDDEN POWER DECREASE Intake system air leak fron
Check hose condition. Install
ACCOMPANIED BY LOUD
hose becoming detached.
hose and hose clamp securely.
NOISE OF RUSHING AIR.
MANIFOLD PRESSURE GAGE
INDICATION WILL NOT PE-
Oil Gage Line Check and Clean
MAIN STEADY AT CONSTANT Contaminated
or Replace
POWER SETTINGS. OR IS
SLUGGISH.
11B-9