TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 ENGINE ABNORMAL OIL PRESSURE 0018 00 MALFUNCTION 9: (Continued) Excessive oil consumption (150:1 fuel-to-oil ratio maximum). PROBABLE CAUSE CORRECTIVE ACTION c. Seasonal grade of oil improper (oil too light) for ambient temperature. (1) Refer to pertinent vehicle lubrication order. (1) Inspect induction system for dust entry (air cleaner seals, hoses and clamps). Repair or replace (WP 0037, Induction Leak Test). (2) Verify cylinder compression (WP 0033, Cylinder Compression Check). d. Piston rings or valve guides worn (result of dust ingestion). (3) If compression test indicates engine damage, repair or replace cylinder (WP 0135, Cylinder Assembly Repair) and piston rings (WP 0142, Pistons, Rings, and Associated Parts Replace/Repair) as required. (1) Refer to WP 0142, Pistons, Rings, and Associated Parts Replace/Repair. (2) Verify cylinder compression (WP 0033, Cylinder Compression Test). e. Piston rings damaged (scuffed due to engine overheating). (3) If compression test indicates engine damage, repair or replace defective parts as required. PROBABLE CAUSE CORRECTIVE ACTION f. Turbocharger defective (worn or damaged seals). (1) Remove inlet and exhaust elbows, then check for evidence of oil. Replace defective turbocharger (WP 0099, Turbocharger Assembly Replacement (2CA & 2DA), use WP 0100 for 2DR). MALFUNCTION 10: Excessive crankcase blow-by (high crankcase pressure). PROBABLE CAUSE CORRECTIVE ACTION a. Rings worn or damaged. Indicated by heavy carbon deposits in breather tube at turbocharger exhaust pipe. (1) Perform Crankcase Blow-by Test as follows: PROCEDURE OBSERVATION ANALYSIS Open rear grille doors and remove transmission cover. Install 10-inch H 2 O gauge in crankcase breather system. WP 0018 00-4