TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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TM 9-2815-237-34 2-41. ENGINE ASSEMBLY FROM SUBASSEMBLIES (Cont’d) f. Timing Chain and Drive Sprockets 1, 2. 3 < 4. 5. 6. 7. Install woodruff key (7) in camshaft (6) and woodruff key (8) in crankshaft (9). Install crankshaft sprocket (10) and camshaft sprocket (4) in timing chain (5) and align timing marks (11). Rotate crankshaft (9) and camshaft (6) so woodruff keys (7) and (8) align with keyway slots in crankshaft sprocket (10) and camshaft sprocket (4). CAUTION Timing marks on crankshaft sprocket and camshaft sprocket must remain aligned after installation or engine damage may result. Install crankshaft sprocket (10), camshaft sprocket (4), and timing chain (5) as an assembly onto camshaft (6) and crankshaft (9). Install pump drive gear (3) on camshaft (6) with washer (2) and capscrew (1). Tighten capscrew (1) to 55-66 lb-ft (75-90 N•m). Apply OE/HDO to timing chain (5). NOTE Perform step 7 only if timing chain was replaced. Check timing chain deflection midway between camshaft sprocket (4) and crankshaft sprocket (10). Total deflection must not exceed 0.5 in. (12.7 mm). If deflection exceeds specification, inspect cam- shaft sprocket (4) and crankshaft sprocket (10) for damage. Replace either if damaged and recheck deflection. 2-164