John Deere — Install Piston and Connecting Rod Assembly
Repair & overhaul
From a John Deere service manual covering: 4039, 4045, 6059, 6068. Check it applies to your exact model before use.
Applies to: John Deere 4039, John Deere 4045, John Deere 6059, John Deere 6068
Before you start
- Be careful so crankshaft journals and cylinder liner walls are not damaged by the connecting rod.
- NEVER use connecting rod cap screws more than once for final engine assembly.
Procedure
- Place JDE84 Ring Compressor with piston and rod over liner so 'FRONT' faces the front of the engine.
- Push piston into liner with piston centered and rings staggered correctly.
- Install bearing insert in connecting rod with tang in groove.
- Apply clean engine oil on insert and crankshaft journal; pull rod and insert against the journal.
- Install bearing insert in connecting rod cap with tang in groove.
- Apply clean engine oil to bearing insert; install cap with tangs to same side.
- Dip NEW connecting rod cap screws in clean oil and install.
- Tighten cap screws alternately to 55 N•m (40 lb-ft) on 3029/4039/6059 or 68 N•m (50 lb-ft) on 4045/6068.
- Torque-turn all cap screws 90—100 degrees.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 3029/4039/6059 initial 55 N•m (40 lb-ft)
- 4045/6068 initial 68 N•m (50 lb-ft)
- Torque turn 1/4 turn (90—100°)
Full service-parts list: John Deere 4039 →, John Deere 4045 →, John Deere 6068 →
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.