11 31 051 Replacing Timing Chain (N52K)

Special tools required: 

For the following special tools, refer to MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

• 00 9 140 

For the following special tools, refer to ENGINE- SPECIAL TOOLS (N52K) .

• 11 0 300 
• 11 4 280 
• 11 4 281 
• 11 4 282 
• 11 4 283 
• 11 4 360 
• 11 4 362 
• 11 5 200 
• 11 9 280 

Necessary preliminary tasks: 

• Remove cylinder head cover  . See 11 12 000 REMOVING AND INSTALLING OR SEALING CYLINDER HEAD COVER (N52K) .
• Remove all spark plugs  . See 12 12 011 REPLACING ALL SPARK PLUGS (N42, N40, N46, N45, N52, N52K, N51) .
• Remove chain tensioner  . See 11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N52K) .
• Remove crankshaft radial seal  at front. See 11 14 005 REPLACING FRONT CRANKSHAFT SEAL (N52K) .
• Remove drive belt tensioner  . See 11 28 020 REPLACING TENSIONING DEVICE FOR ALTERNATOR DRIVE BELT (N52) .
• Remove vibration damper  . See 11 23 010 REMOVING AND INSTALLING/REPLACING VIBRATION DAMPER (N52K) .

Remove fastener (1) in direction of arrow.

Installation: 

Install fastener (1) with bore facing outwards.

Fig 1: Removing Fastener

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Rotate crankshaft at central bolt into TDC position.

Slide special tool 11 0 300  in direction of arrow into special tool bore and secure crankshaft.

Fig 2: Sliding Special Tool (11 0 300)

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If the flywheel is secured in the correct special tool bore with special tool 11 0 300  , the engine can no longer be moved at the central bolt.

Screw special tool 11 9 280  onto hub of vibration damper.

Release central bolt (1).

Tightening torque. See 11 21 1AZ in 11 21 CRANKSHAFT AND BEARINGS or 11 21 CRANKSHAFT AND BEARINGS .

Remove hub towards front.

Fig 3: Identifying Central Bolt With Special Tool (11 9 280)

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Open plug (1).

Tightening torque. See 11 31 7AZ in 11 31 CAMSHAFT .

Fig 4: Identifying Plug

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Open plug (1).

Tightening torque. See 11 11 7AZ in 11 11 CRANKCASE .

Installation: 

Replace aluminum screws. 

Fig 5: Identifying Plug

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

Tightening torque. See 11 31 5AZ in 11 31 CAMSHAFT .

Fig 6: Identifying Bearing Pin From Timing Chain Module On Cylinder Head

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Release bearing pin (1) from timing chain module on crankcase.

Tightening torque. See 11 31 4AZ in 11 31 CAMSHAFT .

Fig 7: Identifying Bearing Pin From Timing Chain Module On Crankcase

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Secure special tool 11 4 283  to cylinder head with bolts (1).

Mount special tool 11 4 281  on inlet and exhaust camshafts.

Do not remove special tool 11 4 280. 

Fig 8: Identifying Cylinder Head Bolts With Special Tools (11 4 282, 11 4 283 And 11 4 281)

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Remove inlet and exhaust adjustment unit.  See 11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N52) .

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

Tightening torque. See 11 31 3AZ in 11 31 CAMSHAFT .

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

Fig 9: Removing Chain Module With Timing Chain And Sprocket Wheel Upwards

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Fig 10: Identifying Sprocket Wheel

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Pull timing chain (1) upwards until sprocket wheel (2) engages chain guide (3).

Install timing chain (1) and sprocket wheel (2) in this position.

Installation: 

Always hold timing chain (1) under tension. Timing chain (1) may jam on chain guide (3).

Fig 11: Identifying Timing Chain, Sprocket Wheel And Chain Guide

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Install hub with central bolt.

Tighten down special tool 11 5 200  with screws (1) to hub.

Fig 12: Identifying Screws With Special Tool (11 5 200)

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Remove tensioner  for drive belt. See 11 28 020 REPLACING TENSIONING DEVICE FOR ALTERNATOR DRIVE BELT (N52) .

Screw in special tool 11 4 362  from special tool kit 11 4 360. 

Mount special tool 11 9 280  on 11 5 200. 

Support special tool 11 9 280  on special tool 11 4 362. 

Special tool 11 0 300  secures crankshaft.

Tighten central bolt to jointing torque.

Tightening torque. See in 11 21 CRANKSHAFT AND BEARINGS or 11 21 CRANKSHAFT AND BEARINGS .

Mark central bolt and hub with paint.

Fig 13: Identifying Special Tool (11 9 280, 11 4 360, 11 5 200 And 11 0 300)

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Mark special tools with colored line (1).

See Fig 14.

Fig 14: Identifying Colored Line

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If necessary, tighten central bolt to torsion angle with special tool 00 9 140. 

Tightening torque. See 11 21 1AZ in 11 21 CRANKSHAFT AND BEARINGS or 11 21 CRANKSHAFT AND BEARINGS .

Tighten central bolt with a second person helping.

Tightening torque. See 11 21 1AZ in 11 21 CRANKSHAFT AND BEARINGS or 11 21 CRANKSHAFT AND BEARINGS .

Install inlet and exhaust adjustment units.  See 11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N52) .

Install chain tensioner.  See 11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N52K) .

Fig 15: Identifying Special Tool (11 9 280, 11 4 360, 11 5 200 And 11 0 300)

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Crank engine twice.

Check timing.  See 11 31 005 Checking Timing Of Camshaft(s) (N52K) .

If necessary, adjust valve timing.  See 11 31 505 ADJUSTING TIMING OF CAMSHAFT(S) (N52K) .

Assemble engine.