John Deere — Torque-Turn Flanged-Head Cap Screws—Grade 180
Adjustments · Cylinder Head Cap Screws
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- DO NOT use multi-viscosity oils to lubricate cap screws; only SAE30 engine oil.
- Cylinder head cap screw torque specs and tightening procedures vary depending on grade/type of cap screw and block casting number.
Procedure
- Lubricate cap screws with clean SAE30 engine oil and install in their proper locations.
- Tighten cap screw No. 17 to 100 N·m (75 lb-ft) first.
- Tighten all remaining cap screws to 100 N·m (75 lb-ft), beginning with No. 1 and proceeding sequentially.
- Retighten all cap screws to 125 N·m (95 lb-ft), beginning with No. 1.
- Make 90° reference marks (A, B) on socket.
- Install socket on cap screw No. 1 and make a reference mark on cylinder head aligning with mark A on socket.
- Turn cap screw 90°—100° until reference mark on head aligns with mark B on socket.
- Repeat Steps 5 and 6 on all remaining cap screws.
Tools required
- JT05993 Torque Angle Gauge (alternative method) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cap screw length locations: 134 mm (5.2 in.) - 2,3,4,5,6,7; 149 mm (5.9 in.) - 23,25,17,21,19; 175 mm (6.9 in.) - 1,15,14,13,12,11,10,8; 203 mm (8.0 in.) - 16,20,22,18,26,24,9
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.