Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing
Replacing the camshaft seals / variable valve timing unit
Removing the front camshaft seal
Note! The illustrations in this service information are used for different model years and / or models. Therefore there may be some variation. However, the essential information in the illustrations is always correct.
Caution! There are a number of versions of the variable valve timing unit. Therefore it is extremely important to always read the information referring to the engine variant/model year to be remedied.
Replacing the rear camshaft seal
See Removing/Installing the rear camshaft seal.
Preparation
Caution! Interrupt the current: Disconnect the battery negative lead. First read Battery, disconnecting Battery Disconnecting.
Remove the timing belt from the timing gear pulley for the camshafts.
Check the tensioner and idler pulleys.
Remove camshaft position (CMP) sensor housing and the trigger wheel.
Remove the cover at the rear edge of the camshaft.
Removing the variable valve timing unit / timing gear pulley
Install adjustment tool 999 5452 CAMSHAFT ADJUSTMENT TOOL 999 5452 Camshaft Adjustment Tool at the rear of the camshafts. Screw the adjustment tool sections together into one. Remove the plug from the front edge of the variable valve timing unit (Tx55).
Remove the centre screw from the variable valve timing unit (Tx55). Carefully pull out the variable valve timing unit with the timing gear pulley.
The following applies to timing gear pulleys without variable valve timing:
Remove the screws. Remove the timing gear pulley.
Removing the front camshaft seal
Carefully press in tool 999 5651 Extractor 999 5651 Extractor between the seal and the camshaft. Pry out the seal.
Installing the front camshaft seal
Note! The purpose of the "Installing the VVT unit/timing gear pulley" section described here is to ensure that the VVT unit is correctly positioned and to reset the camshaft timing gear pulley to the correct position using the markings made at the factory. This is to ensure that the conditions are correct for any later fault-tracing.
Note! For tightening torques, see Tightening torque Tightening Torque.
Cleaning
To clean the shaft journal and mating surface, use emery cloth P/N 951 1024.
Note! When cleaning work around the shaft journal, not in and out. It is essential that any residue from the emery cloth and any other contaminants are completely removed before the new sealing ring is installed.
Installing the front camshaft seal
Lubricate the surface of the seal that the camshaft rotates against. Install the camshaft seal. For camshafts with variable valve timing:
Use drift 999 5718 Drift 999 5718 Drift.
Use the mounting screw for the variable valve timing unit. Tighten until the drift bottoms out. for camshafts without variable valve timing:
Use drift 999 5719 Drift 999 5719 Drift.
Checking the variable valve timing (VVT) unit
Check the variable valve timing (VVT) unit.
Finishing
Install:
- the starter motor. Tighten screws at gearbox. Tighten. See Tightening torque [1][2]Specifications
- the screw at the support bracket for the starter motor. Tighten
- the trigger wheel. Tighten the screw
- the camshaft position (CMP) sensor housing. Tighten the screws
- a new cover at the rear edge of the camshaft.
Install the auxiliaries belt around the pulley on the crankshaft.
Install:
- the plastic nuts for the cover in the right-hand wing liner
- the right front wheel. See Installing wheels Service and Repair.
Install:
- front timing cover. Tension the auxiliaries belt. Check that it is correctly positioned on all pulleys
- the expansion tank
- the hose between the expansion tank and the radiator. Remove the lock grip pliers
- the servo reservoir
- the upper timing cover.
Install:
- the engine stabilizer brace. Tighten the screws
- the screw holding the engine stabilizer brace to the bracket on the engine. Tighten
- the battery negative lead. Also read Battery, disconnecting Battery Disconnecting.
Final check
Check and top up if required:
- coolant level
- the servo fluid level.
Test drive the engine.
Removing/Installing the rear camshaft seal
Preparation
Remove:
- the intake manifold between the electronic throttle module (ETM) and air cleaner (ACL) cover
- the air cleaner (ACL) cover. Place it to one side
- the camshaft position (CMP) sensor housing and the trigger wheel.
Removing the rear camshaft seal
Pull out the seal. Use puller 999 5919 PULLER 999 5919 Puller. To clean the shaft journal and mating surface, use emery cloth P/N 951 1024.
Note! When cleaning work around the shaft journal, not in and out. It is essential that any residue from the emery cloth and any other contaminants are completely removed before the new sealing ring is installed.
Lubricate the surface of the seal that the camshaft rotates against. Install the camshaft seal. Use drift 999 5450 PUNCH 999 5450 Punch.
Note! The seal is normally positioned at the same level as the internally bevelled edge. If the shaft journal is showing signs of wear, the seal can be pressed in a further 2 mm: Turn the drift socket.
Finishing
Install:
- the trigger wheel. Tighten the screw
- the camshaft position (CMP) sensor housing. Tighten the screws
- the air cleaner (ACL) cover
- the intake manifold between the electronic throttle module and the air cleaner (ACL) cover.
Test drive the engine.