Specifications

Maintenance—Every 2000 Hours
TX,86,JC1142 –19–23MAY96–1/4
ADJUST ENGINE VALVE LASH
(CLEARANCE)—644G
1. Remove precleaner, hood, air cleaner support with
starting aid and air cleaner, engine crankcase vent
tube.
2. Plug all openings.
3. Check crankcase ventilation tube for restriction. Clean
with solvent or diesel fuel.
4. Remove rocker arm cover.
5. Remove plugs. Install JDE-81-I Flywheel Turning Tool
(A) and JDE-81-4 Timing Pin (B).
6. Rotate flywheel until timing pin fits into hole in
flywheel.
7. Try to move both pushrods at number one cylinder. If
both are loose, proceed with adjustment per chart on
No. 1 TDC. If both pushrods at number six are loose,
proceed with adjustment per chart on No. 6 TDC.
TX,86,JC1142 –19–23MAY96–2/4
T6105BF –UN–24FEB89
8. Measure and adjust valve clearance with No. 1 piston
or No. 6 at TDC. To change piston position, pull timing
pin out of flywheel, rotate flywheel 360°, and insert
timing pin.
NOTE: Valve clearance can be adjusted whether engine
is hot or cold.
9. Loosen hex nut.
10. Use screwdriver to adjust valve clearance.
11. Tighten hex nut and torque to 9.5 ± 4 N•m (84 ± 36
lb-in.).
86–3
PN=160