11 31 051 Replacing timing chain (N54)

Special tools required:

Necessary preliminary tasks:

Remove FAN COWL
Remove CYLINDER HEAD COVER
Remove all SPARK PLUGS
Remove CHAIN TENSIONER .
Remove CRANKSHAFT SEAL at front
Remove BELT TENSIONER
Remove VIBRATION DAMPER
Remove INTAKE AND EXHAUST ADJUSTERS

Remove fastener (1) in direction of arrow.

Installation note:

Install fastener (1) with bore facing outwards.

Fig 1: Installing Fastener With Bore Facing Outwards

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Secure engine in TDC firing position of cylinder no. 1 with special tool 11 0 300 .

Fig 2: Securing Flywheel Using Special Tool (11 0 300)

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Mark flywheel and transmission housing with a line (1).

NOTE: Illustration shows automatic transmission.

Fig 3: Identifying Crankshaft Mark

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Do not remove special tool 11 4 280 .

Fig 4: Securing Special Tool (11 4 283) On Cylinder Head With Screws

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Procedure, transmission removed.

Secure flywheel (crankshaft) with special tool 11 9 260 .

Fig 5: Securing Flywheel (Crankshaft) With Special Tool (11 9 260)

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Block flywheel (crankshaft) with special tool 11 8 660 on gearbox.

Fig 6: Blocking Crankshaft Using Special Tool (11 8 660)

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Fit special tool 11 8 180 with screws (1).

Secure flywheel in direction of arrow.

Fig 7: Securing Crankshaft Using Special Tool (11 8 180)

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IMPORTANT: To release central bolt (1), remove special tool 11 0 300 .

Release central bolt with a 3/4" socket (1) and if necessary with a 3/4" extension (2).

Tightening torque 11 21 1AZ .

Remove central bolt with hub towards front.

Fig 8: Releasing Central Bolt With Socket And Extension

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Open plug (1).

Tightening torque 11 31 6AZ .

Fig 9: Identifying Screw Plug

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Open plug (1).

Tightening torque 11 31 6AZ .

Fig 10: Identifying Screw Plug

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Release screw (1) on chain drive at top.

Tightening torque 11 31 2AZ .

Fig 11: Identifying Screw On Chain Drive (Top)

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Release screw (1) on chain drive at bottom.

Tightening torque 11 31 3AZ .

Fig 12: Identifying Screw On Chain Drive (Bottom)

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Release screws (1).

Tightening torque 11 31 2AZ .

Remove timing chain module with timing chain and sprocket upwards in direction of arrow.

Fig 13: Removing Chain Module With Timing Chain And Camshaft Sprocket

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IMPORTANT: Note installation direction of sprocket (2).
Collar (see arrow) on sprocket (2) points to crankshaft .
Incorrect assembly will result in engine damage.

Fig 14: Locating Collar On Camshaft Sprocket

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Pull timing chain (1) upwards until sprocket (2) engages chain guide (3).

Install timing chain (1) and sprocket (2) in this position.

Installation note:

Always hold timing chain under tension.

Timing chain (1) may jam on chain module (3).

Fig 15: Identifying Timing Chain, Sprocket And Chain Guide

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IMPORTANT: The N54 engine requires special friction plates between the friction surfaces.
The engine will incur damage if the friction plates are damaged or are not fitted.

Friction plates (1 and 2) are clipped into place on sprocket wheel/oil pump module.

Fig 16: Identifying Friction Plates

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Make sure friction plate (3) is in correct installation position.

Fig 17: Identifying Friction Plate

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Push on friction plate (1) without retainers.

IMPORTANT: The N54 engine requires special friction plates between the friction surfaces.
The engine will incur damage if the friction plates are damaged or are not fitted.

Fig 18: Identifying Friction Plate

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Insert chain module from above and secure with bolt (1).

Make sure gear wheels (2) are in correct installation position.

Insert hub (3) with friction plate.

Tightening torque 11 21 1AZ .

Fig 19: Identifying Bolt, Gear Wheels And Hub

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Secure special tool 00 9 140 with magnet to engine support (1).

Fig 20: Securing Special Tool (00 9 140) With Magnet To Engine Support

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Secure central bolt with special tool 00 9 140 .

Fig 21: Securing Central Bolt With Special Tool (00 9 140)

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Assemble engine.