Workshop Manuals Factory service & repair Aston Martin
01 00 Introduction02 01 Body system03 02 Frame and mounting04 03 Engine05 04 Suspension06 05 Driveline07 06 Brake system08 07 Transmission09 08 Clutch10 09 Exhaust11 10 Fuel12 11 Steering13 12 Climate control14 13 Information, gauge and warning15 14 Power supply16 15 Vehicle entertainment17 16 Vacuum distribution18 17 Lighting19 18 Electric distribution and electronic control20 19 Electronic features21 20 Appendix and glossary
Aston Martin DB9 Factory Workshop Manual (Issue 2, 2005)04 · 03 Engine
04 · Engine

3.1 Initial Torque

Make
Aston Martin
Model
DB9 Factory Workshop Manual
Year
Issue 2, 2005
Section
Engine Structure › 3.1 Initial Torque
03 Engine3.1 Initial Torque

Caution
The following ‘Torque - Release - Torque’ sequence must be performed exactly as specified to ensure correct cylinder head to engine block sealing.

  1. Torque the cylinder head in stages using the following procedure:
Diagram of cylinder head bolt tightening sequence, Left Side Shown, with numbered bolts 1 through 16 and an arrow indicating Engine Front.

3.1 Initial Torque

  1. Torque bolts 1 -14 (M10) to 37-43 Nm. in the sequence shown.
  2. Torque bolts 15-16 (M8) to 15-20 Nm.
  3. Torque bolts 1-14 (M10) a further 85-95° in the sequence shown.

3.2 Release

  1. Loosen bolts 1-14 (M10) a minimum of one full turn (360°).

3.3 Final Torque

  1. Torque bolts 1-14 (M10) to 37-43 Nm. in the sequence shown.
  2. Torque bolts 15-16 (M8) to 23-27 Nm.
  3. Torque bolts 1-14 (M10) a further 85-95° in the sequence shown.
  4. Torque bolts 1-14 (M10) an additional 85-95° in the sequence shown.
  1. Repeat for the second cylinder head.
  2. Install all lash adjusters.

Soak the lash adjusters in engine oil.

Insert each lash adjuster into its correct recess in the cylinder head.

Install the camshaft followers to their valves.

Caution
Ensure that the dimpled end of the camshaft followers are installed to the lash adjusters.

Soak the cam followers in engine oil.

Close-up photograph showing a hand installing a camshaft follower onto a lash adjuster, with labels 'Dimpled End' and 'Lash Adjuster'.
  1. Lubricate the camshaft journals, camshaft bearing caps with engine oil.
  2. Ensure the crankshaft key is vertical.

Caution
The crankshaft key must remain in the vertical position until the camshaft chains are correctly installed and tensioned. Movement of the crankshaft before completion of valve timing may cause contact between a piston and a valve, resulting in valve and / or piston damage.

The crankshaft key is exactly in line with No.1 crankshaft throw. With the crankshaft key vertical, No.1 piston is 30° ATDC and all pistons are below engine block surface.

Crankshaft key alignment and valve timing setup procedure

Parts & tools for this job For 2005 Aston Martin DB9

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