11 31 051 Replacing timing chain (N54, N54T)

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

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: Removing Timing Chain Fastener

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)

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

NOTE: Graphic shows automatic transmission.

Fig 3: Identifying Flywheel And Transmission Housing Line Marking

Do not remove special tool 11 4 280 .

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

Procedure, transmission removed.

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

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

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

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

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

Secure flywheel in direction of arrow.

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

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 Using 3/4 Socket And Extension

Open plug (1).

Tightening torque 11 31 6AZ .

Fig 9: Identifying Timing Chain Plug

Open plug (1).

Tightening torque 11 31 6AZ .

Fig 10: Identifying Timing Chain Plug

Release screw (1) on chain drive at top.

Tightening torque 11 31 2AZ .

Fig 11: Identifying Chain Drive Screw (Top)

Release screw (1) on chain drive at bottom.

Tightening torque 11 31 3AZ .

Fig 12: Identifying Chain Drive Screw (Bottom)

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 And Sprocket

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 Installation Direction

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

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 16: Identifying Timing Chain Sprocket Friction Plates

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

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

Fig 17: Identifying Timing Chain Sprocket And Bolts

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