TM 5-4310-386-14
Table 6-1. General Support Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6.
ENGINE GIVES POOR PERFORMANCE (Cont).
Step 3.
Check to see if cylinders and/or piston rings are worn.
Replace cylinder or piston rings (para. 5-42 and 5-43).
Step 4.
Check to see if piston crown clearance is excessive.
Adjust clearance (para. 5-40).
7.
ENGINE OIL PRESSURE ZERO OR TOO LOW.
Step 1.
Check to see if lube oil pump is defective.
Repair lube oil pump (para. 5-33).
Step 2.
Check to see if main and/or connecting rod bearings are defective.
Replace bearings (para. 5-44).
Step 3.
Check to see if cylinder and/or piston rings are worn.
Replace cylinders or rings, as required (para. 5-42 and 5-43).
8.
ENGINE SMOKES BLUE.
Check to see if cylinders and/or piston rings are worn.
Replace cylinders or piston rings (para. 5-42 and 5-43).
9.
ENGINE SMOKES WHITE.
Step 1.
Check to see if commencement of delivery setting is incorrect.
Adjust timing (para. 5-30).
Step 2.
Check to see if compression pressure is too low.
Replace piston rings, valves or cylinders, as required (para. 5-41, 5-42, and 5-43).
Step 3.
Check to see if piston crown clearance is excessive.
Adjust clearance (para. 5-40).
10. ENGINE SMOKES BLACK.
Step 1.
Check to see if commencement of delivery setting is incorrect.
Adjust timing (para. 5-30).
Step 2.
Check to see if amount of fuel being injected is excessive.
Adjust timing (para. 5-30).
Step 3.
Check to see if valve clearance is incorrect or valves are worn.
Adjust valve clearance or replace valve (para. 5-41).
Step 4.
Check to see if compression pressure is too low.
Replace piston rings, valves or cylinders, as required (para. 5-41, 5-42, and 5-43).
6-4
