John Deere 9.0 L Diesel Engines — Cylinder Head Cap Screw Torque Procedure
Repair & overhaul
For the John Deere 9.0 L Diesel Engines, from the John Deere service manual.
Applies to: John Deere 6090H engine
Before you start
- ALWAYS use NEW cap screws when installing cylinder head; cap screws may be used only one time.
- DO NOT use multi-viscosity oils to lubricate cap screws; SAE30 is recommended.
- If a cap screw is accidentally tightened more than 90° in any one sequence, DO NOT loosen it; make adjustments in the next sequence.
- Cap screws MUST NOT be tightened more than a total of 270° ± 5°.
Procedure
- Lubricate cap screws with clean SAE30 engine oil and install in their proper locations; arrow points toward front of engine.
- Tighten cap screw No. 17 to 80 N·m, then sequentially start at No. 1 and proceed through No. 26, tightening all to 80 N·m.
- Draw a reference line parallel to the crankshaft across the entire top of each cap screw head.
- Sequentially (No. 1 through No. 26) turn each cap screw 90°.
- Again sequentially turn each cap screw 90°.
- Finally, sequentially turn each cap screw 90° so the line is as close as possible to perpendicular to the crankshaft.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Initial torque 80 N·m (60 lb-ft)
- Total amount of turn from steps 4, 5 and 6 is 270° ± 5°
Full service-parts list: John Deere 6090H engine →
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.