Timing Chain: Service and Repair

11 31 051 Replacing timing chain (N54, N54T)

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.





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





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

Note:
Graphic shows automatic transmission.

Do not remove special tool 11 4 280.








Procedure, transmission removed.

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





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

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

Secure flywheel in direction of arrow.








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.





Open plug (1).

Tightening torque 11 31 6AZ.

Open plug (1).

Tightening torque 11 31 6AZ.








Release screw (1) on chain drive at top.

Tightening torque 11 31 2AZ.





Release screw (1) on chain drive at bottom.

Tightening torque 11 31 3AZ.

Release screws (1).

Tightening torque 11 31 2AZ.





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





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





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).

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.





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





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.

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.





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





Secure central bolt with special tool 00 9 140.

Remove crankshaft seal at front

Install intake and exhaust adjusters.





Install chain tensioner.

Crank engine twice.

Check timing.

Assemble engine.