John Deere — Measure Valve Lift
Testing & diagnosis · Camshaft, followers, push rods
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
- Measure valve lift at 0.00 mm (in.) rocker arm-to-valve tip clearance for accuracy.
Procedure
- Remove rocker arm cover.
- Lock No. 1 piston at TDC compression stroke.
- Set rocker arm-to-valve tip clearance to 0.00 mm (in.) for the specified valves.
- Place dial indicator tip on top of valve spring retainer or rotator; preload and set dial at 0.0 mm.
- Remove timing pin and rotate engine one full revolution (360°) in running direction.
- Observe dial indicator reading at full open; record maximum and compare with specifications.
- Repeat for remaining valves after rotating one revolution to the appropriate TDC.
Tools required
- JDG820 or JDE83 Flywheel Turning Tool Amazon
- JDE81-4 Timing Pin Amazon
- Dial indicator Amazon
- Feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake lift 11.56—12.37 mm (0.455—0.487 in.); wear limit 11.13 mm (0.438 in.)
- Exhaust lift 11.28—12.12 mm (0.444—0.477 in.); wear limit 10.85 mm (0.427 in.)
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.