TM10-3930-660-20 Table  2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION Step 2. Check for inadequate intake air and restrictions. Inspect air cleaner and change elements if necessary, para. 5-5. Clean or replace air intake system as necessary, para. 5-5. Step 3. Check for air leak between the turbocharger and the exhaust manifold. Replace the turbocharger gasket if necessary, para. 5-7. Step 4. Check for air leaks in the air crossover tube, hoses, and through holes in the manifold cover. Replace parts as necessary, para.  4-10 and 5-8. Step 5. Check for leaks in the exhaust manifold.   Inspect manifold for cracks. Replace manifold if necessary, para. 4-9. Step 6. Check for a malfunctioning turbocharger. Replace turbocharger if necessary, para. 5-7. 11. ENGINE LUBRICATING OIL PRESSURE LOW Step 1. Check for low engine oil level. a. Replenish engine oil as necessary, L05-3930-660-12. b. Replace any lines found with oil leaks that could reduce oil pressure, para.  5-9. Step 2. Check engine oil for thin viscosity, diluted, or wrong specification. Verify that correct oil is being used,   see LO1O-393O-66O-12. Check for oil dilution. Refer to troubleshooting for Engine Contaminated Lube Oil, Step 14. Step 3. check for malfunctioning pressure switch or gauge. Replace the engine oil pressure switch, para. 8-15, or gauge, para.  8-7. Step 4. Check for plugged oil filter. Replace oil filter if plugged, para. 4-3. 12. ENGINE  LUBRICATING  OIL  PRESSURE  TOO HIGH Step 1. Check for malfunctioning engine oil pressure switch or gauge. Replace the engine oil pressure switch, para. 8-15 and gauge, para. 8-7. 2-33