TM-5-4310-389-14
Table 3-2. Unit Troubleshooting Procedures (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE (Contd)
20.
Engine gives poor performance.
Step 1. Check to see if engine shutdown lever is not in the operating position. Place shutdown lever
in operating position.
Step 2. Check to see if oil level is too high. Drain to proper level.
Step 3. Check to see if air cleaner is contaminated. Clean or replace air cleaner.
Step 4. Check to see if speed control lever is not reaching full-load stop. Free of obstruction.
Step 5. Check to see if fuel filter and/or lines are fouled. Notify Direct Support Maintenance. Clean
or replace fuel filter, flush fuel lines.
Step 6. Check to see if there is air in fuel system. Air bleed the fuel system.
Step 7. Check to see if fuel feed pump is defective (diaphragm). Replace, as required. Notify
Direct Support Maintenance.
Step 8. Check to see if exhaust back pressure is excessive. Clean cooling systems of
contamination. Notify Direct Support Maintenance.
21.
Engine oil pressure zero or too low.
Step 1. Check to see if engine is excessively inclined. Ensure that inclination is no greater than 15
degrees in direction.
Step 2. Check to see if engine oil is too low. Fill to proper level.
Step 3. Check to see if wrong grade of motor oil is being used. Change to proper viscosity oil.
Step 4. Check to see if lube oil cooler is soiled. Clean exterior and flush core.
Step 5. Check oil suction pipe strainer for blockage or leakage. Clean or change strainer. Notify
Direct Support Maintenance.
22.
Engine oil consumption excessive.
Step 1. Check to see if the engine is excessively inclined. Ensure that engine is not inclined 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.
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