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Kod: Markera alltReplacing the timing belt
Special tools:
999 5433
999 5456
Removing the timing belt
Note! Since 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.
Preparation
S2101704 Caution! Remove the ignition key.
Remove
the screw holding the engine stabiliser brace to the bracket on the engine
the screws holding the engine stabiliser brace to the suspension turrets
the engine stabiliser brace.
Applies only to B6xx4T engines:
Remove the plastic pipes between the turbocharger (TC) and charge air cooler (CAC) and between the air cleaner (ACL) and turbocharger (TC). Put them to one side.
Remove the clamp from the intake manifold for the turbocharger (TC) for cylinders 1, 2 and 3. Turn the upper section of the pipe towards the bulkhead.
S2101715 Relieve the load from the belt tensioner. Remove the auxiliaries belt.
Remove the upper timing belt cover.
Remove the front timing belt cover.
For cars with chassis numbers 203779-, see Timing cover front, replacing .
Lift up the servo reservoir and place it on top of the engine.
Note! Ensure that the power steering oil does not leak from the breather hole in the filler cap.
Seal the hose between the expansion tank and the radiator. Disconnect the hose at the tank.
Lift up the expansion tank and place it on top of engine.
A2101065 Raise the car.
Remove
the right front wheel
the plastic nuts on the cover in the wing liner.
Install the upper timing belt cover.
Turn the crankshaft clockwise until the markings on the crankshaft and camshaft pulleys correspond.
Turn the crankshaft a further 1/4 turn clockwise.
Then turn back counter-clockwise until the markings correspond.
Remove the upper timing belt cover.
S2101308 Remove the 4 vibration damper screws. Counterhold the crankshaft central nut.
Remove
the vibration damper
the auxiliaries belt
the belt cover behind the crankshaft pulley for the auxiliaries belt.
Spray universal oil or similar around the rubber sleeve on the underside of the oil pump.
Remove the rubber sleeve.
Removing the timing belt
D2101803 Slacken off the belt tensioner
Slacken off the centre screw for the belt tensioner slightly.
Hold the centre screw still. Turn the tensioner eccentric counter-clockwise using a 6 mm Allen key. Turn to 10 o'clock.
Unhook and remove the timing belt.
Note! The component can be reused unless it has been subjected to abnormal mechanical stress, damage or oil contamination.
Caution! The crankshaft or camshafts must not be rotated while the timing belt is removed.
Checking the tensioner pulley and idler pulley
Check bearing wear:
Spin the idler pulley and listen for noise. If replacing with a new idler pulley, tighten to 24 Nm.
Spin the tension pulley and listen for noise. When replacing, screw the tension pulley into place using the centre screw.
Screw in the centre screw by hand.
Ensure that the tensioner fork is centred over the cylinder block rib / bracket.
Ensure that the Allen hole on the eccentric is at "10 o'clock".
Installing the timing belt
Installing the timing belt
D2101797 Note! The component can be reused unless it has been subjected to abnormal mechanical stress, damage or oil contamination.
Install the belt in the following order:
crankshaft
the idler pulley
intake cam
exhaust cam
water pump
tension pulley.
Note! The variable valve timing unit on B6304S does not have a return spring. The unit is easily dislodged when reinstalling the timing belt.
Tensioning the timing belt
A2101335 This adjustment is done with a cold engine. Suitable temperature is approximately 20 ° C/ 68 ° F.
At a higher temperature, for example with a warm engine or a higher ambient temperature, the needle is farther to the right.
The illustration shows the position of the indicator when aligning the timing belt tensioner at different temperatures.
Carefully turn the crankshaft clockwise until the timing belt is tensioned. The belt must be in tension between the intake camshaft pulley, the idler pulley and the crankshaft.
Hold the belt tensioner centre screw secure. Turn the belt tensioner eccentric clockwise until the tensioner indicator passes the marked position.
Then turn the eccentric back so that the indicator reaches the marked position in the centre of the window.
Hold the eccentric secure. Tighten the centre screw to 25 Nm.
Check that the indicator is in the correct position.
Check
D2101798 Press the belt to check that the indicator on the tensioner moves easily.
Install the upper timing belt cover.
Turn the crankshaft 2 turns. Check that the markings on the crankshaft and camshaft pulley correspond.
Check that the indicator on the belt tensioner is within the marked area.
Finishing
S2101308 Install the auxiliaries belt around the pulley on the crankshaft.
Install
the rubber sleeve on the underside of the oil pump
the vibration damper. Use new screws. Tighten to 35 Nm. Angle-tighten 50°. Use the crankshaft centre nut as a counterhold
the plastic nuts for the cover in the right-hand wing liner
the right front wheel. See Installing wheels .
S2101310 Lower the car.
the front timing belt cover.
For cars with chassis numbers 203779-, see Timing cover front, replacing:Installing the front timing cover .
Tension the auxiliaries belt.
the expansion tank
the hose between the expansion tank and the radiator. Remove the lock grip pliers
the servo reservoir
the upper timing belt cover.
Applies only to B6xx4T engines:
Twist the intake pipe for the turbocharger for cylinders 1, 2 and 3 into position. Tighten the clamp.
Install the plastic hoses between the turbocharger (TC) and the charge air cooler and between the air cleaner (ACL) and the turbocharger (TC).
Tighten the hose clamps.
S2101307 the engine stabiliser brace. Tighten to 50 Nm
the screw holding the engine stabiliser brace to the bracket on the engine. Tighten to 80 Nm.
Final check
Check and top up if required
coolant level
the servo fluid level.
Test drive the engine.
- By AndS