11 31 051 Replacing timing chain (N20, N26)

Special tools required:

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Remove all SPARK PLUGS .
Remove VIBRATION ABSORBER .
Remove CRANKSHAFT SEAL at front.
Check TIMING .
Removing oil sump . See 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N20, N26) or 11 13 000 REMOVING AND FITTING, SEALING OR REPLACING THE OIL SUMP (N20 ALL-WHEEL DRIVE VEHICLE) .

Push back the chain tensioner with the tensioning rail (1).

Secure chain tensioner using special tool 11 4 120 .

Fig 1: Pushing Chain Tensioner With Tensioning Rail

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Engine removed:

Block crankshaft at flywheel with special tool 11 9 260 .

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

Fig 2: Releasing Central Bolt

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Vehicles with manual gearbox:

Attach special tool 11 8 180 to manual transmission with existing transmission bolts (1).

Block crankshaft in direction of arrow with special tool.

Fig 3: Connecting Manual Transmission To Special Tool (11 8 180)

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Vehicles with automatic transmission:

Block crankshaft with special tool 2 222 742 .

Feed in special tool, slide screw forward and tighten.

Fig 4: Sliding Screw Of Special Tool (2 222742)

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IMPORTANT: Breakaway torque of central bolt > 600 Nm.
A 3/4 inch tool is needed to release the central bolt.

Release central bolt (1).

Tightening torque 11 21 1AZ .

Fig 5: Releasing Central Bolt

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IMPORTANT: Remove special tool (1) to release the central bolts on the intake and exhaust camshaft adjusters.

Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Order number: 83 30 2 212 831

Fig 6: Removing Intake And Exhaust Camshaft Adjusters

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Remove CHAIN TENSIONER .

Screw in vibration absorber screws (1).

Pull out hub (2) on crankshaft forward in direction of arrow.

Fig 7: Pulling Out Hub On Crankshaft

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Open screw plug (1).

Tightening torque 11 31 8AZ .

Fig 8: Identifying Screw Plug

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Release bearing journal (1) from timing chain module on cylinder head.

Tightening torque 11 31 6AZ .

Fig 9: Identifying Bearing Journal And Timing Chain Module

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Release screw plugs (1 and 2).

Tightening torque 11 11 7AZ .

Fig 10: Identifying Screw Plugs

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Release bearing journal (1) on left and right of timing chain module for timing chain on crankcase.

Tightening torque 11 31 5AZ .

Fig 11: Identifying Bearing Journal Of Timing Chain Module

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Release bolts (1) from timing chain module on cylinder head.

Tightening torque 11 31 4AZ .

Remove chain module with timing chain and camshaft sprocket upwards.

Fig 12: Identifying Bolts From Timing Chain Module

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Remove timing chain module (1) upward.

Fig 13: Removing Timing Chain Module

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IMPORTANT: Note direction of installation of camshaft sprocket (2).
Collar (see arrow) on sprocket (2) points to Engine .
Incorrect assembly will result in Engine Damage .

Fig 14: Locating Camshaft Sprocket

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

Install timing chain and camshaft sprocket in this position.

Installation note:

Permanently hold timing chain under tension. Timing chain may jam on chain guide (1).

Fig 15: Locating Timing Chain And Chain Guide

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Loosen sealing cap using a screwdriver.

Fig 16: Loosening Sealing Cap Using Screwdriver

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Installation note:

Turn engine at central bolt until special tool 2 212 825 can be positioned in counterbalance shaft.

Secure special tool 2 212 825 to oil pump housing with screw (1).

Fig 17: Securing Special Tool (2 212 825) To Oil Pump Housing With Screw

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Fit hub and central bolt (1).

Fig 18: Identifying Central Bolt

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Remove special tool 11 4 120 .

Fig 19: Removing Special Tool (11 4 120)

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Insert central bolt (1) with hub for crankshaft.

Tighten down central bolt (1).

Tightening torque 11 21 1AZ .

Install INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Fig 20: Tightening Central Bolt

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Remove all special tools.

Crank engine twice.

Check TIMING .

Replace front CRANKSHAFT SEAL .

Assemble engine.