INSPECTION WARNING Volatile mineral spirits burn easily and fumes can explode. Do not smoke or allow open flame nearby when using mineral spirits. Failure to do so may cause serious injury or death to personnel. 1. All metallic parts should be cleaned thoroughly with mineral spirits and dried with lint-free cloth. 2. Inspect metallic parts including impellers (4) and (13) for chips, cracks, or burrs. Replace any part with visible chips or cracks. 3. Inspect oil pump body (3) and oil pump body assembly (5) for cracks, casting imperfections, damaged threads, and scoring. If damaged, replace oil pump body (3) or body assembly (5). 4. Inspect pressure relief plunger (9) for scoring, burrs, and sticking. If pressure relief plunger (9) is scored or sticking, replace pressure relief plunger (9). 5. Insert impellers (4) and (13) into oil pump body assembly (5) and oil pump body (3). If loose in oil pump body (3) or oil pump body assembly (5), replace oil pump body assembly (5) and oil pump body (3). 6. Inspect intake tube (15) for broken wire mesh in screen (18). If screen (18) is broken or has been removed from intake tube (15), replace intake tube (15). ASSEMBLY 1. Install pressure relief plunger (9), spring (10), and retaining washer (12) on oil pump body assembly (5) with screw (11). 2. Position impeller (4) on oil pump body assembly (5), and using arbor press, install driven gear (8) onto impeller (4) until flush with shaft of impeller (4). 3. Install impeller (13) on oil pump body (3). 4. Install oil pump body (3) on oil pump body assembly (5) with four washers (6) and screws (7). 5. Install new gasket (14) and intake tube (15) on oil pump body (3) with two washers (16) and screws (17). 6. Install new O-ring (2) and outlet elbow (1) on oil pump body (3) with screw (19). 7. Apply sealing compound to screw (29), and install spacer (25), bearing (26), idler gear (27), and washer (28) on oil pump body assembly (5) with screw (29). Tighten screw (29) 39-61 lb-ft (53-83 N•m). INSTALLATION 1. Install new O-ring (21) and oil pump body assembly (5) on cylinder block (20) with two new lockwashers (22), screws (23), and screw (24). 2. Install engine oil pan (WP 0312 00). TM 9-2320-386-24-1-2 0313 00 ENGINE OIL PUMP MAINTENANCE (Contd) 0313 00-4