TM-5-4310-389-14
Table 5- 1. General Support Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE (Contd)
8.
Engine oil pressure zero or too low.
Step 1.
Check to see if oil control valve is defective.
Repair control valve.
Step 2.
Check to see if lube oil pump is defective.
Repair lube oil pump.
Step 3.
Check to see if main and/or connecting rod bearings are defective.
Replace bearings.
Step 4.
Check to see if cylinder and/or piston rings are worn.
Replace cylinders or rings, as required.
9.
Engine smokes blue.
Step 1.
Check to see if cylinders and/or piston rings are worn.
Replace cylinders or piston rings.
10.
Engine smokes white.
Step 1.
Check to see if commencement of delivery setting is incorrect.
Adjust timing.
Step 2.
Check to see if compression pressure is too low.
Replace piston rings, valves or cylinders, as required.
Step 3.
Check to see if piston crown clearance is excessive.
Adjust clearance.
11.
Engine smokes black.
Step 1.
Check to see if commencement of delivery setting is incorrect.
Adjust timing.
Step 2.
Check to see if amount of fuel being injected is excessive.
Adjust timing.
Step 3.
Check to see if valve clearance is incorrect or valves are worn.
Adjust valve clearance or replace valve.
Step 4.
Check to see if compression pressure is too low.
Replace piston rings, valves or cylinders, as required.
12.
Engine does not run smoothly.
Step 1.
Check to see if fuel feed pump is defective (diaphragm).
Repair, as required.
Step 2.
Check to see if commencement of delivery setting is incorrect.
Adjust timing.
5-3
