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 TM 10-3930-633-34
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINEContinued
3. ENGINE LACKS POWER.
Step 1. Check malfunctions under "FUEL SYSTEM."
Step 2. Check malfunctions under "IGNITION- SYSTEM."
Step 3. Perform compression check, para. 6-8.
Repair cause of poor compression, according to test results.
Step 4. Perform manifold vacuum test (para. 6-7).
Repair cause of vacuum leak, according to test results.
Step 5. Check for broken valve spring (para. 6-19).
Replace broken valve spring (para. 6-21).
4.
HIGH OIL CONSUMPTION.
Step 1. Check for oil leaks at pan, gasket surfaces or crankshaft main seals.
Replace pan gaskets. Replace main seal (paragraphs 6-35 and 6-36).
Step 2. Check for improper grade and type of oil.
Drain and refill with proper grade and type of oil (see LO 10-3930-633-12).
Step 3. Check for engine overheating; causing thinning of oil.
Refer to "COOLING SYSTEM" for causes of overheating.
Step 4. Perform compression check to determine if rings and valve guides are excessively worn.
Overhaul engine (Chapter 6).
Step 5. Check crankshaft main bearing and connecting rod bearing clearance (Chapter 6, Section VII).
Fit new bearings (para. 6-33).
5.
LOW COMPRESSION.
Step 1. Inspect valves and valve seats for wear.
Overhaul cylinder head (Chapter 6, Section IV).
Step 2. Check pistons, rings and cylinder bores for excessive clearance, wear and scoring.
Overhaul engine (Chapter 6).
Step 3. Check cylinder head and block for cracks, warped gasket surfaces, or broken gaskets.
Overhaul engine (Chapter 6).
6.
LOW OR NO OIL PRESSURE.
Step 1. Check oil level.
Fill crankcase with proper quantity and type of oil (see LO 10-3930-633-12).
Step 2. Check for oil leakage at cylinder head, crankshaft main seals, or timing chain cover.
Repair or replace as required (see Chapter 6).
Step 3. Check oil pump for internal wear (para. 6-44).
Repair oil pump para. 6-45).
7
BEARING FAILURE.
Step 1. Check oil pump for proper operation (para. 6-44).
Repair oil pump (para. 6-45).
Step 2. Check crankshaft journals for out-of-round or roughness (para. 6-30).
Replace crankshaft (para. 6-29). Refer damaged crankshaft to depot maintenance for reconditioning.
Step 3. Check connecting rod trueness (para. 6-31).
Replace or straighten bent rod (para. 6-28).
8.
VALVES STICKING OR BURNED.
Step 1. Check valve stem clearance (para. 6-17).
Overhaul cylinder head (Chapter 6, Section IV).
Step 2. Check for weak, bent or broken valve spring.
Replace defective valve spring (para. 6-21).
Step 3. Test for seised or defective valve lifter (para. 6-20).
Replace defective lifter (para. 6-21).
Step 4. Check valve timing.
Retime camshaft (Chapter 6, Section VIII).
Step 5. Check valve stem straightness and finish (para. 6-17).
Replace bent or worn valves.
PROPELLER SHAFT
1. NOISY OPERATION.
Step 1. Check for lack of lubrication.
Lubricate in accordance with LO 10-3930-633-12.
Step 2. Check for worn or damaged bearings.
Repair propeller shaft (para. 8-2).
Step 3. Check for loose or improper mounting.
Tighten and correct as required.
2-4
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