John Deere — Adjust Valve Clearance Serial Number (200,000— )
Adjustments · Cylinder head and valves
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- To prevent accidental starting, always disconnect NEGATIVE (—) battery terminal.
- Valve clearance MUST BE checked and adjusted with engine COLD.
Procedure
- Disconnect carrier wiring harness.
- Remove rocker arm cover with vent tube.
- Remove wires from electronic injectors and remove carrier.
- Install flywheel turning tool and timing pin.
- Rotate engine until timing pin engages timing hole and No. 1 cylinder is at TDC-compression.
- Adjust valve clearance on Nos. 1, 3, and 5 exhaust and Nos. 1, 2, and 4 intake valves.
- Rotate flywheel 360° to bring No. 6 piston to TDC-compression.
- Adjust valve clearance on Nos. 2, 4, and 6 exhaust and Nos. 3, 5, and 6 intake valves.
- Install carrier and tighten cap screws in order shown.
- Install injector wiring leads and solenoid wire retaining nuts.
- Install rocker arm cover with vent tube and tighten capscrews in order shown.
Tools required
- JDE81-1 or JDG820 Flywheel Turning Tool Amazon
- JDE81-4 Timing Pin Amazon
- Feeler gauge Amazon
- Screwdriver Amazon
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake valve clearance checking: 0.30—0.41 mm (0.012—0.016 in.) cold
- Exhaust valve clearance checking: 0.51—0.61 mm (0.020—0.024 in.) cold
- Intake valve clearance adjustment: 0.36 mm (0.014 in.) cold
- Exhaust valve clearance adjustment: 0.56 mm (0.022 in.) cold
- Carrier-to-cylinder head cap screws torque: 8 N·m (5.9 lb-ft)
- Solenoid wire retaining nuts torque: 1.75 N·m (1.29 lb-ft)
- Rocker arm cover capscrews torque: 8 N·m (5.9 lb-ft)
Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.