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 TM 55-1905-223-24-1
Table 2-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
STEP 5.
Check if injectors defective.
Replace defective injector. Refer to para. 2-31.
18. Low Power.
STEP 1.
Inspect for foreign object fouling propeller.
Check propeller, remove foreign object, reference TM 55-1905-223-24-18.
STEP 2.
Check if fuel suction line or fuel filter is restricted.
Check fuel inlet restriction. Replace fuel filter elements if necessary.
Refer to PMCS Table 2-1, Item 8.
STEP 3.
Check if lubricating oil level is too high.
Drain to "H" mark on dipstick or sight glass.
STEP 4.
Check if throttle linkage adjustment incorrect.
Check throttle linkage adjustment for full opening of throttle lever.
STEP 5.
Check if intake or exhaust system restricted.
Check intake and exhaust system for restrictions while engine is running using a manometer
Remove restriction.
STEP 6.
Check for air in fuel.
Bleed air from fuel lines, tighten fuel connections, tighten filter.
STEP 7.
Check for poor fuel quality. Take fuel sample if necessary.
Drain and clean fuel tanks. Replenish fuel.
STEP 8.
Check for air or exhaust leaks between turbocharger and engine.
Tighten all connections.
STEP 9.
Check fuel rate using fuel flow measuring instrument (P/N 3376375).
Refer to manufacturer's instruction and testing procedures.
Check fuel pressure by attaching a gauge with minimum capacity of 300 psi
(2070 kPa) at the fitting on the fuel pump outlet.
Check air manifold (turbocharger) by attaching a gauge with a minimum
capacity of 90 in.-Hg (2286 mm-Hg) to one of the plugs in the air
crossover.
a. If fuel rate ok, fuel pressure high, and turbocharger pressure okay, replace injectors.
Refer to para. 2-31.
b. If fuel rate ok, fuel pressure high, and turbocharger pressure okay or low, replace
injectors. Refer to para. 2-31.
c. If fuel rate low, fuel pressure ok, and turbocharger pressure low, replace injectors.
Refer to para. 2-31.
d. If fuel rate ok, fuel pressure ok, and turbocharger pressure low, check intake air
restriction. Replace turbocharger if necessary. Refer to para. 2-19.
e. If fuel rate ok, fuel pressure high, and turbocharger pressure ok, check for restrictions
in fuel lines.
2-29
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