TM5-6115-585-34
NAVFAC P-8-262-12
TO-35C2-3-455-2
TM-05684C-34
Table 2-3. Troubleshooting (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. METALLIC KNOCKING, CLICKING, OR POUNDING FROM CRANKCASE OR CYLINDER BLOCK.
Step 1. Check for worn or loose comecting rod bearings (paragraph 7-10).
Replace bearings if necessary.
Step 2. Check for loose piston and connecting rod assembly (paragraph 7-10).
Repair or replace assembly.
14. LOW ENGINE COMPRESSION.
NOTE
Normal cylinder pressure is between 350 and 450 psi depend-
ing upon engine condition. Maintenance should be considered
if pressure is below 325 psi or if there is a 15 percent or
more difference between cylinders.
Step 1. Check for loose cylinder head (paragraph 7-9).
Properly tighten head.
Step 2. Check for leaky head gasket (paragraph 7-9).
Replace gasket.
Step 3. Check for broken valve spring (paragraph 7-9).
Replace broken springs.
Step 4. Check for sticking valves (paragraph 7-9).
See sticking valve section below.
Step 5. Check for leaking valves (paragraph 7-9).
Clean and, if necessary, regrind valves and valve seats.
Step 6. Check for worn or sticking piston rings (paragraph 7-10).
Replace rings if necessary. Check condition of cylinder walls.
Step 7. Check for worn cylinder walls and pistons (paragraphs 7-10 and 7-19).
Refinish cylinder walls. Repair or replace pistons.
15. STICKING VALVES.
Step 1. Check for dirty, scored, or gummy valve stems or guides (paragraph 7-9).
Clean stems and guides. If necessary, replace guides.
Step 2. Check for weak or broken springs (paragraph 7-9).
Replace springs.
2-9
