Operation CHARM: Car repair manuals for everyone.
Home >> Subaru >> 2007 >> Impreza WRX STI F4-2.5L DOHC Turbo >> Repair and Diagnosis >> Specifications >> Mechanical Specifications >> Engine >> System Specifications >> Tightening Torque
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Tightening Torque

Cylinder Head





Tighten all bolts to 29 Nm (3.0 kgf-m, 22 ft-lb) in alphabetical order.
Further tighten all bolts to 69 Nm (7.0 kgf-m, 51 ft-lb) in alphabetical order.
Loosen all the bolts by 180° in reverse order of installation, and loosen again by 180°.
Tighten all bolts to 49 Nm (5.0 kgf-m, 36 ft-lb) in alphabetical order.
Tighten all bolts by 80 to 90° in alphabetical order.
Tighten all bolts by 40 to 45° in alphabetical order.

CAUTION:
Do not tighten the bolts 45 or more.

Further tighten the bolts (A) and (B) by 40 to 45°.

CAUTION:
Make sure that the total "re-tightening angle" of the previous steps (7) and (8) does not exceed 90°.


Camshaft Cap





Gradually tighten the camshaft cap and oil control valve assembly in at least two stages in alphabetical order shown in the figure, and then tighten to specified torque.


Connecting Rod
Tightening torque 52 Nm (5.3 kgf-m, 38.4 ft-lb)


Crankshaft Pulley






Water Pump





Tighten bolts in two stages in alphabetical sequence as shown in the figure.
^ Use a new gasket.


Oil Pump
Tightening torque 44 Nm (4.5 kgf-m, 32.5 ft-lb)
pro multis · About Operation CHARM