1 15 10. TIMING CHAIN COVER, TIMING CHAIN, AND DRIVE SPROCKETS MAINTENANCE 1
This task covers:
General mechanics tool kit:
automotive (Appendix B, Item 1)
Dial indicator (Appendix B, Item 113)
Gasket (Appendix G, Item 72)
Three woodruff keys (Appendix G, Item 46%
Sealant gasket set (Appendix C, Item 65)
Lubricating oil (Appendix C, Item 44)
l Torsional damper removed (para. 15-7).
l Water pump and adapter plate removed
1 a. Removal 1
In some cases, flanged-head fasteners may be present instead of
standard fasteners and washers. In all cases, washers should be
used when replacing a flanged-head fastener with a standard
Remove three capscrews (1) and driven gear (2) from injection pump (7).
Remove two capscrews (16), nut (3), and baffle (4) from timing chain cover (5).
Remove three nuts (9) and washers (8) from injection pump (7) and timing chain cover (5).
Remove four capscrews (11) from timing chain cover (5) and oil pan (12).
Remove five capscrews (14), four washers (13), timing chain cover (5), and gasket (6) from cylinder
block (10). Discard gasket (6).
When measuring timing chain deflection, slack should be
removed from one side before measurement is taken on opposite
Using dial indicator, check deflection of timing chain (21) midway between camshaft sprocket (20)
and crankshaft sprocket (27). Total deflection must not exceed 0.810 in. (20.6 mm). If deflection
exceeds specification, timing chain (21) must be replaced.
Using dial indicator, check end play of camshaft (22). End play must not be more than 0.012 in.
(0.3 mm). If end play exceeds specification, camshaft sprocket (20) and thrust plate (24) must be
inspected for wear after removal.
Remove capscrew (17), washer (18), pump drive gear (19), and camshaR sprocket (20) from camshaft (22).
Remove crankshaft sprocket (27), camshaft sprocket (20), and timing chain (21) as an assembly.
Cover oil pan opening to prevent woodruff keys from falling into
Remove two woodruff keys (25) from crankshaft (26) and woodruff key (23) from camshaft (22).
Discard woodruff keys (25) and (23).