Mitsubishi S12A2 — Tightening cylinder head bolts
Adjustments
For the Mitsubishi S12A2, from the Mitsubishi service manual.
Applies to: Mitsubishi S12A2
Before you start
- Observe specified tightening sequence.
Procedure
- Method according to tightening torque: tighten cylinder head bolts to specified torque in sequence.
- Loosen all bolts once, and tighten them again in the same manner.
- Method according to tightening angle: tighten to specified snug torque in sequence.
- Tighten by turning 30 ± 1.5°.
- Tighten further by turning 30 ± 1.5° (total 60 ± 3°).
- Loosen all bolts once, and tighten again by repeating the same procedure.
Tools required
- Socket wrench P/N 32591-01100 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Torque method: 392 ± 20 N·m [Wet] 2-time tightening
- Angle method snug torque short bolt: 118 ± 5.9 N·m
- Angle method snug torque long bolt: 196 ± 9.8 N·m
Full service-parts list: Mitsubishi S12A2 →
Source: Mitsubishi 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.