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Home›Repair guides›John Deere›Check and Adjust Valve Clearance (all except 4045HF475 and 6068HF475)

John Deere 6068HF475 — Check and Adjust Valve Clearance (all except 4045HF475 and 6068HF475)

Adjustments · Valve train

For the John Deere 6068HF475, from the John Deere owner's manual.

Applies to: PowerTech 6068HF475

Before you start

  • Valve clearance must be checked and adjusted with engine COLD.

Procedure

  1. Disconnect NEGATIVE battery terminal.
  2. Remove rocker arm cover and crankcase ventilator tube.
  3. Rotate flywheel to No. 1 cylinder TDC compression; insert timing pin.
  4. Check intake and exhaust valve clearance cold.
  5. Loosen jam nut; turn adjusting screw until feeler gauge slips with slight drag.
  6. Hold adjusting screw; tighten jam nut to specification.
  7. Recheck clearance after tightening jam nut.
  8. Replace rocker arm cover and ventilator tube.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Intake 0.36 mm (0.014 in.) cold
  • Exhaust 0.46 mm (0.018 in.) cold
  • Jam nut 27 N.m (20 lb-ft)

Full service-parts list: PowerTech 6068HF475 →

Source: John Deere owner'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.

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