John Deere — Install Cylinder Head and Cap Screws Serial Number ( —199,999)
Repair & overhaul
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Only ASTM Grade 180 flanged-head cap screws marked SPECIAL are recommended. ALWAYS use NEW cap screws.
- 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; adjust in next sequence.
- Cap screws MUST NOT be tightened more than a total of 270° ± 5°.
Procedure
- Put a new head gasket on cylinder block dry; do not use sealant on gasket.
- Lower cylinder head evenly into correct position over dowels and flat on block top deck.
- Dip entire cap screw in clean SAE30 engine oil and allow excess oil to drip off.
- Install correct length cap screws marked SPECIAL in proper locations.
- Tighten cap screw No. 17 to 80 N·m (60 lb-ft).
- Sequentially tighten all cap screws from No. 1 through No. 26 to 80 N·m (60 lb-ft).
- Draw a line parallel to crankshaft across top of each cap screw head.
- Sequentially turn each cap screw 90°; line will be perpendicular to crankshaft.
- Again sequentially turn each cap screw 90°; line will be parallel to crankshaft.
- Sequentially turn each cap screw 90°; total turn 270° ± 5°.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cylinder head flanged-head SPECIAL cap screws initial torque: 80 N·m (60 lb-ft)
- Total amount of turn from final three steps: 270° ± 5°
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.