TM 5-4310-386-14
Table 4-2. Unit Troubleshooting Procedures (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. ENGINE SMOKES BLUE.
Step 1. Check to see if the engine is excessively inclined.
Ensure that engine is not inclinded over 15 degrees.
Step 2. Check to see if oil level is too high.
Drain to proper level.
Step 3. Check to see the engine is run mainly at low load.
Operate engine at rated rpm.
9. ENGINE SMOKES BLACK.
Step 1. Check to see if oil bath air cleaner is contaminated.
Clean oil bath air cleaner (para. 4-37).
Step 2. Check to see if exhaust back pressure is excessive.
Clear exhaust system of blockage (para. 4-42).
Step 3. Check fuel return lines for clogging or crimping.
Clean, replace as necessary (para. 4-31).
10. ENGINE DOES NOT RUN SMOOTHLY.
Step 1. Check to see if engine mounts are loose.
Tighten engine mounts (para. 4-53).
Step 2. Check to see if there is air in the fuel system.
Air bleed the fuel system (para. 4-30).
Step 3. Check to see if fuel return line is clogged.
Flush return line (para. 4-35).
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