11 31 051 Replacing timing chain

WARNING: This page is about a different variant/trim than selected.

Special tools required:

00 9 120
11 9 280
11 9 540
11 9 590

IMPORTANT: Modified procedure for timing adjustment.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove all spark plugs. See REPLACING ALL SPARK PLUGS .
Remove camshaft adjustment unit. See REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS .
Remove CHAIN TENSIONER .
Remove both VANOS adjustment units. See REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS .
Remove PTFE RING at front.
Remove BELT TENSIONER .

Position crankshaft with special tool 11 9 590.

Do not remove special tool 11 9 590 during repair work.

Fig 1: Identifying Special Tool (11 9 590)

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Do not remove special tool 11 9 540.

Fig 2: Do Not Remove Special Tool (11 9 540) During Repair Work

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IMPORTANT: Employ a second person for gripping when releasing central bolt (1).

Fit special tool 11 9 280 on hub for vibration damper with screws (2).

Fig 3: Identifying Special Tool (11 9 280), Central Bolt And Screws

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Release central bolt in direction of arrow.

Tightening torque 11 21 1AZ

Fig 4: Releasing Central Bolt

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Release bearing pins (1 and 2).

Tightening torque 11 31 6AZ

Fig 5: Identifying Bearing Pins

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Remove hub (3) towards front.

Remove chain module with timing chain.

Using a hook (2), pull oil pump chain (1) upwards.

Fig 6: Removing Hub

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Sprocket wheel (1) of timing chain.

Sprocket wheel (2) of oil pump.

Fig 7: Identifying Sprocket Wheels

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Secure chain module (1) with rubber (3) to facilitate assembly.

Pull timing chain (2) upwards until sprocket wheel (4) rests against chain guide (1).

Install timing chain (2) and sprocket wheel (4) in this position.

Installation:

Always keep timing chain (2) tensioned; it is possible for timing chain (2) to jam on chain module (1).

Fig 8: Identifying Timing Chain, Chain Module, Sprocket Wheel And Rubber

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Installation position of both sprocket wheels.

Sprocket wheel (1) of oil pump.

Guide rail (2) of timing chain.

Hub (3) on crankshaft.

Sprocket wheel (4) of timing chain.

Fig 9: Identifying Sprocket Wheels, Guide Rail And Hub

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Attach oil pump sprocket wheel (2) in direction of arrow to crankshaft (1).

Insert chain module with timing chain and secure.

Attach crankshaft hub.

Screw in central bolt.

Fig 10: Attaching Oil Pump Sprocket Wheel To Crankshaft

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Remove special tool 11 9 280 from hub.

Secure central bolt with special tool 00 9 120.

Fig 11: Identifying Special Tools (11 9 280 And 00 9 120)

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Install VANOS adjustment units. See REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS .

Crank engine twice.

Check TIMING .

Install PTFE RING .

Assemble engine.