Adjust Engine Valve Lash (Clearance)

causym CAUTION: Prevent accidental starting of engine while performing valve adjustments. Always disconnect NEGATIVE (-) battery terminal.

IMPORTANT: Valve clearance MUST BE checked and adjusted with engine COLD.

1. Remove parts as necessary.

2. Plug all openings.

3. Check crankcase ventilation tube for restriction. Clean with solvent or diesel fuel.

4. Remove rocker arm cover.

5. Install JDE-81-1 Flywheel Turning Tool (A).

6. Turn flywheel until JDE-81-4 Timing Pin (B) goes into hole in flywheel.

T6129AJ


A-Turning Tool
B-Timing Pin

TX,87,DY2081 -19-09JAN97-1/3

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.

T6119AI

TX,87,DY2081 -19-09JAN97-2/3

NOTE: Valve clearance can be adjusted whether engine is hot or cold.

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.

Specification

Intake Valve (I) -Clearance 0.36 mm (0.014 in.)
Exhaust Valve (E) -Clearance 0.45 mm (0.018 in.)

9. Remove turning tool and timing pin.

10. Clean cylinder head and rocker arm cover mating surfaces.

11. Install rocker arm cover gasket. Do not use sealant on the gasket.

12. Install rocker arm cover. Tighten screws to 10.8 Nm (96 lb-in.). Do not overtighten cap screws.

13. Install parts.

T6872AG


A-No. 1 TDC Compression Stroke
B-No. 6 TDC Compression Stroke
C-Fan End of Engine

TX,87,DY2081 -19-09JAN97-3/3