11 31 051 Replacing timing chain (N54, N54T)

Special tools required:

Necessary preliminary tasks

Remove fan cowl. See 17 11 035 REMOVE AND INSTALL OR REPLACE THE FAN COWL WITH ELECTRIC FAN (N53, N54, N54T, N55) .
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 Timing Chain Fastener

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

Fig 2: Sliding Special Tool (11 0 300)

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

NOTE: Graphic shows automatic transmission.

Fig 3: Identifying Flywheel And Transmission Housing Marking Line

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Do not remove special tool 11 4 280 .

Fig 4: Identifying Special Tool (11 4 281) And (11 4 283)

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Procedure, transmission removed

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

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

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

Fig 6: Identifying 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: Installing 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: Removing Central Bolt With Hub

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Open plug (1).

Tightening torque: 11 31 6AZ .

Fig 9: Identifying Timing Chain Open Plug

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Open plug (1).

Tightening torque: 11 31 6AZ .

Fig 10: Identifying Timing Chain Open Plug

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Release screw (1) on chain drive at top.

Tightening torque: 11 31 2AZ .

Fig 11: Identifying Chain Drive Screw

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Release screw (1) on chain drive at bottom.

Tightening torque: 11 31 3AZ .

Fig 12: Identifying Chain Drive Screw

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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 Timing Chain Module Screws

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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: Identifying 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 Wheel 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 Wheel/Oil Pump Module Friction Plates

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

Fig 17: Identifying Wheel/Oil Pump Module Friction Plates Installation Position

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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