TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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TM 9-2815-237-34 2-15. ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d) s. Timing Chain and Drive Sprockets NOTE When measuring timing chain deflection, slack should be removed from one side before measurement is taken on opposite side. 1. Using dial indicator, check timing chain (10) deflection midway between camshaft sprocket (4) and crankshaft sprocket (11). Total deflection must not exceed 0.810-in. (20.6 mm). If deflection exceeds specification, timing chain (10) must be replaced. 2. Using dial indicator, check camshaft end play. Camshaft end play must not be more than 0.012-in. (0.3 mm). If end play exceeds specification, camshaft sprocket (4), thrust plate (7), and spacer must be inspected for wear after removal. 3. Remove capscrew (1), washer (2), and pump drive gear (3) from camshaft (5). 4. Remove crankshaft sprocket (11), camshaft sprocket (4), and timing chain (10) as an assembly. NOTE Cover oil pan opening to prevent woodruff key from falling into oil pan. 5. Remove woodruff key (8) from crankshaft (9) and woodruff key (6) from camshaft (5). Discard woodruff keys (8) and (6). 2-28