VVT Unit Intake Camshaft, Replacing

VVT unit intake camshaft, replacing

Special tools:
999 7229 Counterhold 999 7229 Counterhold
999 7232 Key 999 7232 Key
999 7236 Position setter 999 7236 Position Setter

Note! As the illustrations in this service information are used for different model years and/or models, some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Remove the negative battery cable. First read: Battery, disconnecting Battery Disconnecting.
Remove the camshaft chain. See Camshaft chain, replacing, B8444S Removal and Replacement.




Turn the crankshaft back approximately 45°, so that the position setting tool is straight up. The camshafts should rotate freely.

Removing load from the camshaft/valve lifters




Turn the camshafts for cylinder head, 1-3-5-7, Bank 1, approximately 45° (clockwise).




Turn the camshafts for cylinder head, 2-4-6-8, Bank 2, approximately 10° (counter clockwise).

Removal

Removing the variable valve timing (VVT) unit





Remove:
- the cap, 4 x M6
- the 2 x M6 screws for the chain tensioner
- 2 x filter. Discarded.




Remove the caps, 8 x M6.

Note! Ensure that the camshaft is relieved from load against the valve lifters to prevent damaging the components.

Note location.





Remove:
- the chain tensioner
- the camshaft.

Unlocking the VVT unit

Caution! The VVT unit is only unlocked at replacement.




Clean the bearing surface.




Apply tape.




Make a hole in the tape for one of the oil lubrication holes.




Using a nozzle blow in the oil lubrication hole. At the same time turn counter clockwise.

Removing the variable valve timing (VVT) unit





Note! The VVT unit is first unlocked when the position of the hole corresponds to the illustration: hole no. 1 must be to the left of an imaginary line between hole no. 2 and 3.





Remove:
- the center screw
- the VVT unit from the camshaft.

Installation

Note! for tightening torques, see Tightening Torque

Installing VVT-unit

Note! Ensure that the VVT unit is unlocked, see: Unlocking the VVT unit.

Install:
- the VVT unit on the camshaft
- the 1 x M10 screw; do not tighten.





Install:
- the camshaft
- the chain tensioner.

Note! Adjust the marking on the VVT unit to the color marking on the camshaft chain.





Install:
- the caps
- the 8 x M6 screws. Tighten, see Tightening Torque





Install:
- new filter, x 2
- the cap, 4 x M6. Tighten, see: Tightening Torque
- the screws for the chain tensioner, 2 x M6. Tighten. See Tightening Torque




Install tool 999 7236 Position setter 999 7236 Position Setter.

Unlocking the VVT unit




Tighten the camshaft's center screw. Tighten to 20 Nm. Turn the VVT unit clockwise to its limit position.

Note! The VVT unit is locked when the position of the hole corresponds to the illustration: hole no. 1 must be to the right of an imaginary line between hole no. 2 and 3.

Note! Remove the camshaft's center screw.

Installing the camshaft chain
Install the camshaft chain. See: Camshaft chain, replacing, B8444S Removal and Replacement.




Minimize the slack of the chain on the inner camshaft chain. Use tool 999 7232 Key 999 7232 Key.
For cylinder head 1, 3, 5 and 7 (Bank1)Turn the exhaust camshaft's VVT unit, counter clockwise, until the chain is tensioned underneath.
For cylinder head 2, 4, 6 and 8 (Bank2) Turn the exhaust camshaft's VVT-unit, counter clockwise, until the chain is tensioned on top.
Tighten the screw in the center of the intake camshaft's VVT unit. Tighten to 20 Nm.




Install tool 999 7229 Counterhold 999 7229 Counterhold on the intake camshaft.
Tighten the center screw on the camshaft, 1 x M10. See: Tightening Torque
Remove the counterhold.
Install the camshaft chain. See: Camshaft chain, replacing, B8444S Removal and Replacement.