John Deere — Install Valves
Repair & overhaul · Cylinder head
From a John Deere service manual covering: 4045, 4045TF120, 6068, 6068 HF485, 6068HF158, 6068TF120, 6068TF250, 6068TFM50, 6068TFM76. Check it applies to your exact model before use.
Applies to: John Deere 4045, John Deere 4045TF120, John Deere 6068, John Deere 6068 HF485, John Deere 6068TF120, John Deere 6068TF250, John Deere 6068TFM50, John Deere 6068TFM76
Before you start
- Replace valves, seats, springs and retainers in pairs (four-valve)
- Valve springs MUST be installed with small diameter end away from cylinder head (four-valve)
Procedure
- Lubricate valve stems and guides with clean engine oil.
- Insert valves in head (same location if reused).
- Use valve stem seal installer to slide seals over stems onto guide tower.
- Install valve springs and rotators.
- Compress springs and install retainer locks.
- Strike end of each valve three or four times with a soft mallet.
- Recheck valve recess.
Tools required
- JDE138 Valve Spring Compressor Amazon
- JDG678 Valve Stem Seal Installer (two-valve) Amazon
- JDG1651 Valve Seal Installer (four-valve) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Recheck valve recess after installation
Full service-parts list: John Deere 4045 →, John Deere 6068 →, John Deere 6068 HF485 →, John Deere 6068TF250 →, John Deere 6068TFM50 →, John Deere 6068TFM76 →
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.