Check and Adjust Engine Valve Clearance (4045 and 6068 Engines)

CD30544-UN-19MAY98

Lock Engine at Top Dead Center

A - Flywheel Turning Tool

B - Timing Pin

Adjust engine valve clearance as follows or have your authorized servicing dealer or engine distributor adjust the engine valve clearance.

1. Remove rocker arm cover and crankcase vent tube.

2. Using JDE83 or JDG820 Flywheel Turning Tool (A), rotate engine flywheel in running direction (clockwise viewed from water pump) until No. 1 piston (front) has reached top dead center (TDC) on compression stroke. Insert timing pin JDG1571 (B) into flywheel bore.

3. 
   RG7409-UN-06AUG96

   Adjust Valve Clearance

   A - Locknut

   Check and adjust valve clearance to specifications according to the following procedure:

   Item	Measurement	Specification
   Valve Clearance (Engine Cold)	Intake	0.35 mm (0.014 in.)

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4. If valves need adjusting, loosen the locknut on rocker arm adjusting screw. Turn adjusting screw until feeler gauge slips with a slight drag. Hold the adjusting screw from turning with screwdriver and tighten locknut (A) to 27 N·m (20 lb.-ft.). Recheck clearance after tightening locknut. Readjust clearance as necessary.

5. Reinstall rocker arm cover and crankcase vent tube.

RG4776-UN-31OCT97

Valve Clearance Adjustment on 4045 Engines

A - Front of Engine

B - No. 1 Piston at TDC Compression Stroke

C - No. 4 Piston at TDC Compression Stroke

E - Exhaust Valve

I - Intake Valve

NOTE: Firing order is 1-3-4-2.

1. Lock No. 1 piston at TDC compression stroke (B).

2. Adjust valve clearance on No. 1 and 3 exhaust valves and No. 1 and 2 intake valves.

3. Rotate flywheel 360°. Lock No. 4 piston at TDC compression stroke (C).

4. Adjust valve clearance on No. 2 and 4 exhaust valves and No. 3 and 4 intake valves.

RG4777-UN-31OCT97

Valve Clearance Adjustment on 6068 Engines

A - Front of Engine

B - No. 1 Piston at TDC Compression Stroke

C - No. 6 Piston at TDC Compression Stroke

E - Exhaust Valve

I - Intake Valve

NOTE: Firing order is 1-5-3-6-2-4.

1. Lock No. 1 piston at TDC compression stroke (B).

2. Adjust valve clearance on No. 1, 3, and 5 exhaust valves and No. 1, 2, and 4 intake valves.

3. Rotate flywheel 360°. Lock No. 6 piston at TDC compression stroke (C).

4. Adjust valve clearance on No. 2, 4, and 6 exhaust valves and No. 3, 5, and 6 intake valves.