TM 55-1930-209-14&P-21
Table 6-1. General Support Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Engine Fails to Start
Check for poor compression.
Replace piston rings (paras 6-31 thru 6-33).
Repair or replace valves.
2. Engine Produces Excessive Smoke at Idle Speed
Step 1. Check for worn valve guides.
Replace valve guides (paras 6-69 thru 6-71).
Step 2. Check for worn or broken piston rings.
Replace piston rings (paras 6-31 thru 6-33).
Step 3. Check for scored or defective cylinder liners.
Replace piston rings (paras 6-31 thru 6-32) and cylinder liners (paras 6-34 thru 6-36).
3. Engine Produces Excessive Smoke Under Load
Check for worn or broken piston rings.
Replace piston rings (paras 6-31 thru 6-33).
4. Engine Lacks Power
Step 1. Check for broken or worn piston rings.
Replace piston rings (paras 6-31 thru 6-33).
Step 2. Check for scored or worn pistons and liners.
Replace pistons and rings (paras 6-31 thru 6-33) or liners (paras 6-34 thru 6- 33).
5. Engine Consumes an Excessive Amount of Fuel
Check for worn or sticking valves.
Repair or replace valves.
6. Engine Consumes an Excessive Amount of Oil
Step 1. Check for worn or broken piston rings.
Replace piston rings (paras 6-31 thru 6-33).
Step 2. Check for worn valve guides.
Replace valve guides.
6-2
