TM 9-2320-361-34 I 3-10. VALVE TAPPETS MAINTENANCE (Contd) CAUTION Tappets exterior must be coated with new engine oil prior to installation. This provides for initial lubrication when engine is started. Failure to oil tappets may result in damage to tappet bores, tappets, or camshaft lobes. 1. Coat twelve tappets (2) with new engine oil. 2. Install and seat twelve tappets (2) in tappet bores (1) of engine block (3). FOLLOW-ON TASKS: . Install rocker arms and pushrods (para. 3-7). ● Install tappet chamber cover (if removed) (para. 3-9). ● Install oil cooler and oil filter housing (if removed) (para. 3-14). ● Install air compressor support (if removed) (para. 3-15). 3-33