John Deere — Checking and Adjusting Valve Clearance (All Except 475)
Adjustments · Valve train
From a John Deere operator's manual — check it applies to your exact model before use.
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Before you start
- Valve clearance must be checked and adjusted with engine cold.
Procedure
- Disconnect negative battery terminal.
- Remove rocker arm cover and crankcase vent tube.
- Remove timing hole plugs.
- Rotate engine to No. 1 TDC compression; insert timing pin.
- Check intake clearance 0.31-0.38 mm; exhaust 0.41-0.48 mm cold.
- Adjust intake to 0.36 mm; exhaust to 0.46 mm cold.
- Tighten jam nut to 27 N·m; recheck clearance.
- Reinstall rocker arm cover and vent tube.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake 0.31-0.38 mm check, 0.36 mm adjust; Exhaust 0.41-0.48 mm check, 0.46 mm adjust; Jam nut 27 N·m
Source: John Deere operator's 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.