TM9-2320-361-34 3-10. VALVE TAPPETS MAINTENANCE THIS TASK COVERS: a. Removal c. Installation b. Cleaning and Inspection INITIAL SETUP APPLICABLE MODELS All TOOLS General mechanic’s tool kit (Appendix B, Item 1) MATERIALS/PARTS Lubricating oil, OE/HDO 30 (Appendix C, Item 13) REFERENCES (TM) TM 9-2320-361-10 TM 9-2320-361-34P TM 9-2815-210-34-2-2 EQUIPMENT CONDITION ● Parking brake set (TM 9-2320-361-10). ● Air compressor support removed (front only) (para. 3-15). ● Oil cooler and oil cooler filter housing removed, front only (para. 3-14). ● Tappet chamber cover removed (rear only) (para. 3-9). ● Rocker arms and pushrods removed (para. 3-7). CAUTION Camshaft and tappets are a matched set. All tappets removed must be tagged for installation. Failure to do this may result in damage to tappets or camshaft. NOTE Sludge from engine oil may build upon external surfaces of tappets. When this condition exists, drycleaning solvent maybe applied to tappets while working tappets up and down to loosen sludge and aid removal. Remove and tag twelve tappets (2) from tappet bores (1) in engine block (3). b. Cleaning and Inspection 1. For general cleaning instructions, refer to para. 2-8. NOTE Normal tappet and camshaft lobe wear is indicated by a slight inward coning or dishing effect of the cam contact surface on tappets. 2. Inspect tappets (2) for coned, scored, or grooved cam contact. Minor surface coning is acceptable when cam contact surface is free of grooving and scoring, otherwise replace. 3. Inspect machined sides of twelve tappets (2) for grooving or scoring. Replace if defective. 4. If tappets (2) need replacement, inspect twelve tappet bores (1) and lobe surfaces of camshaft. Refer to TM 9-2815-210-34-2-2 for inspection. 3-32