11 31 544 Checking timing chain for elongation and replacing top timing chain (N47 D/C K/U/O/T 0/1)

Special tools required:

Installation note:

To remove and install the timing chain, special tool 2 354 985 is required.

All the tools shown are available in tool set 2 354 985 .

Necessary preliminary tasks:

The marking on exhaust sprocket wheel (A) must be aligned with the marking on intake sprocket wheel (E).

NOTE: See Fig 1.

Fig 1: Identifying Camshaft Sprocket Markings

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Installation note:

It is not permitted to turn the engine back, measured values are distorted.

Special tool 11 5 320 must be exactly in the alignment position.

Remove protective cap of gear case cover.

Turn engine with special tool 11 6 480 .

Use special tool 11 5 320 to block the crankshaft in the TDC firing position

Cylinder 1

Fig 2: Identifying Special Tool (11 5 320)

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Place special tool 11 8 760 on exhaust camshaft.

Fig 3: Identifying Special Tool (11 8 760)

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Determine gap dimension.

Slide feeler gauge (1) between cylinder head and special tool 11 8 760 without jamming (see arrow).

Fig 4: Sliding Feeler Gauge Between Cylinder Head And Special Tool (11 8 760)

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Follow diagnosis instruction.

IMPORTANT: Loose chain sections can fall into the engine!

IMPORTANT: Screws (1) can fall into the chain drive risk of damage!

Secure special tool 2 354 958 to cylinder head with screws (1).

Tightening torque: 11 00 2AZ .

Fig 5: Identifying Special Tool (2 354 958) To Cylinder Head With Screws

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Remove special tool 2 353 281 .

Fig 6: Identifying Special Tool 2 353 281

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Installation note:

Install chain tensioner with part number 8 576 201 (AF 24).

Replace sealing ring.

Tightening torque: 11 12 3AZ .

Fig 7: Identifying Chain Tensioner Bolt

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Cover cylinder head (1) at chain drive with a suitable cleaning cloth.

Mark right rivet (2) at cover tab (3) (see arrow).

Fig 8: Identifying Mark Right Rivet And Cover Tab

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Opening the timing chain:

Turn back pressing-off bolt (1) on special tool 2 354 984.

Fig 9: Identifying Special Tool (2 354 984)

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Installation note:

Bore hole (centering aid)

Turn back pressing-off bolt on special tool 2 354 984 up to short length (see arrow).

Fig 10: Pressing Bolt On Special Tool (2 354 984)

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IMPORTANT: Loose rivet can fall in the engine compartment.
Seal bore hole on special tool 2 354 983 with suitable auxiliary materials.

Position special tool 2 354 983 on timing chain (rivet) (center).

Pretension spindle 2 354 984 up to bolt/limit position of timing chain by hand.

Press off rivet with pressing-off bolt (1), screw in special tool up to limit position.

Fig 11: Positioning Special Tool (2 354 983) On Timing Chain

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Remove rivet (1) from special tool 2 354 983 with a magnet (2).

Remove special tool 2 354 983.

Fig 12: Removing Rivet From Special Tool (2 354 983) With Magnet

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Installation note:

Coat ends of chain lock (1) with grease.

Tightening the timing chain:

Attach chain lock (1) in the open timing chain.

Check camshaft sprocket for wear.

Fig 13: Attaching Chain Lock In Timing Chain

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IMPORTANT: Observe direction of installation!
Oil holes (3) must be visible from the outside.

Attach timing chain (2) in the chain lock (1).

Both timing chains must be aligned with each other.

Outer tab on lock (1) must be aligned with the outer tabs of the timing chains (see Fig 14).

Fig 14: Attaching Timing Chain In Chain Lock

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NOTE: Turn engine in direction of engine rotation until the run-through timing chain can be removed.

Keep timing chains (1) under tension.

Do not crank engine too far under any circumstances.

Fig 15: Turning Timing Chains

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IMPORTANT: Loose components can fall into the chain drive risk of damage!

Remove timing chain (3) with chain lock (2).

Fig 16: Removing Timing Chain With Chain Lock

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Pressing in the timing chain:

IMPORTANT: Loose components can fall into the chain drive risk of damage!

Press in both end of timing chain (1) on camshaft sprocket.

Insert chain lock (2) from the rear through both ends of new timing chain (1).

Fig 17: Pressing Both End Of Timing Chain On Camshaft Sprocket

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Installation note:

Rounded sides (2) of cover tab (1) must point towards timing chain.

Fig 18: Identifying Rounded Sides Of Cover Tab Pointing Toward Timing Chain

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Prepare special tool 2 354 976 with cover tab (1) using the rounded side (see Fig 19).

Fasten cover tab (1) on magnets of special tool 2 354 976.

Fig 19: Identifying Special Tool (2 354 976) With Cover Tab

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IMPORTANT: Loose components.

Prepare special tool 2 354 976 with cover tab on special tool 2 354 962.

Fig 20: Identifying Cover Tab On Special Tool (2 354 962)

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IMPORTANT: Maximum 20 Nm
Do not increase torque, risk of damage on chain lock.

Manually join cover tab on chain lock to spindle on special tool 2 354 962.

Make sure chain locks and special tool 2 354 976 are positioned exactly risk of damage!

Press on cover tabs with 20 Nm.

Graphic shows removed chain drive.

Fig 21: Identifying Chain Locks And Special Tool (2 354 976)

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IMPORTANT: Do not exceed maximum 20 Nm torque on chain lock not risk of damage!
For safety purposes, the chain lock must be pressed in again.

Fig 22: Identifying Special Tool (2 354 962)

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Remount special tool 2 354 976 on special tool 2 354 962 (see Fig 23).

Press in both rivets individually on chain lock with special tool 2 354 962 to maximum 20 Nm.

Check both rivets (see Fig 23).

Fig 23: Pressing Both Rivets On Chain Lock

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Follow diagnosis instruction.