TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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a. Cleaning TM 9-2815-237-34 2-19. CAMSHAFT, TIMING CHAIN, AND DRIVE GEARS REPAIR This task covers: a. Cleaning b. Inspection INITIAL SETUP Tools Equipment Condition General mechanic’s tool kit: Engine disassembled into subassemblies automotive (Appendix E, Item 1) (para. 2-15). Micrometer (Appendix E, Item 16) “V” blocks (Appendix E, Item 21) Dial indicator (Appendix E, Item 10) Manual References TM 9-2815-237-34P Clean all components in accordance with para. 2-9. b. Inspection 1. 2. 3. 4. 5. 6. 7. NOTE ● For general inspection instructions, refer to para. 2-10. ● All lifters must be replaced when replacing camshaft. Inspect camshaft bearing journals (7) and lobes (8) for damage. Replace camshaft (6) if damaged. Measure diameter of bearing journals (7) using outside micrometer. Replace camshaft (6) if any bearing journal (7) is out of specification (table 2-2 or 2-3). Support camshaft (6) on "V" blocks. Using dial indicator and “V" blocks, measure cam lobe (8) lift. Replace camshaft (6) if any cam lobe (8) is out of specification (table 2-2 or 2-3). Inspect crankshaft sprocket (9), camshaft sprocket (3), pump drive gear (10), and pump driven gear (1) for damage. Replace any gear or sprocket if damaged. Inspect timing chain (2) for cracks, breaks, or binding. Replace if cracked, broken, or binding. Inspect camshaft thrust plate (4) and spacer (5) for damage. Replace if damaged. 2-58