Perkins 900 Series — To tighten the cylinder head setscrews and fasteners
Repair & overhaul
For the Perkins 900 Series, from the Perkins service manual.
Applies to: Perkins 900 Series CP/CR engine
Before you start
- Do not tighten cylinder head fasteners again with engine hot or after limited service.
Procedure
- Tighten setscrews 1-8 in sequence to 70 Nm (52 lbf ft) 7,1 kgf m.
- Repeat step 1 to ensure all setscrews are at correct torque.
- Tighten further by 60° (1 flat) in correct sequence.
- Tighten setscrews a further 60° (1 flat) in correct sequence.
- Tighten fasteners 9-12 in sequence to 50 Nm (37 lbf ft) 5,1 kgf m.
- Repeat step 7 to ensure fasteners are at correct torque.
- Tighten fasteners 9-12 further by 60° (1 flat) in correct sequence.
Tools required
- Angle gauge 21825607 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Setscrews 1-8: 70 Nm then 60° then 60°
- Fasteners 9-12: 50 Nm then 60°
Source: Perkins 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.