TM10-3930-660-20 Table 2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION 15. FUEL OR OIL LEAKING FROM EXHAUST MANIFOLD Step 1. Check for intake air restriction. a. Clean or replace air cleaner filter element if necessary TM10-3930-660-10. b. Review vehicle operation for excessive idling. Step 2. Check for obstructed turbocharger drain line(s). Remove and clean turbocharger drain line, para. 5-9. Step 3. Check turbocharger and gasket for leaking oil. Replace turbocharger or gasket if necessary, para. 5-7. 16. COMPRESSION KNOCKS Step 1. Check for air in the fuel system. Bleed the fuel system, para. 5-12. Step 2. Check for poor quality fuel. Verify by operating from a temporary tank with good fuel. Clean and flush the fuel/hydraulic tank, para.  5-10. Step 3. Check for overloaded engine. Check that the engine load rating is not being exceeded, para. 1-12. 17. EXCESSIVE FUEL CONSUMPTION Step 1. Check for additional loading from malfunctioning accessories. Check for malfunctioning accessories and vehicle components and repair or replace as necessary. Step 2. Check for incorrect operator technique. Review vehicle operation for correct gear shifts, deceleration, and idling, see TM10-3930-660-10. 2-35