11 31 051 Replacing timing chain (M62 up to 9/98): Removal

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Removal of timing chain is described separately from installation. Assembly sequence for removal and installation is different.

Remove spark plugs, refer to 12 12 011 REPLACING ALL SPARK PLUGS (M60, M62) .

Remove both cylinder head covers, refer to 11 12 004 REMOVING AND INSTALLING/SEALING BOTH CYLINDER HEAD COVERS (M62) .

Remove oil lines on left and right of cylinder head.

Fig 1: Removing Oil Lines On Left And Right Of Cylinder Head

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Remove vibration damper, refer to 11 23 010 REMOVING AND INSTALLING/REPLACING VIBRATION DAMPER (M62) .

Release central bolt of hub for vibration damper, refer to 11 23 031 REMOVING AND INSTALLING/REPLACING HUB FOR VIBRATION DAMPER (M62) .

Rotate engine at slackened central bolt in direction of rotation until the first cylinder is in TDC firing position.

Fig 2: Rotating Engine Until First Cylinder Is In TDC Firing Position

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NOTE: In TDC position of first cylinder, marker bores of camshafts point upwards.

Fig 3: Identifying Marker Bores Of Camshafts

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Secure crankshaft in TDC position with special tool 11 2 300.

Fig 4: Holding Crankshaft In TDC Position With Special Tool 11 2 300

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Remove piston for chain tensioner, refer to 11 31 090 INSTALLING AND REMOVING / REPLACING PISTON FOR CHAIN TENSIONER (M62) .

Remove timing case cover, top left, refer to 11 14 085 REMOVING AND INSTALLING TIMING CASE COVER, TOP RIGHT (M62 VANOS FROM 9/98) .

Remove timing case cover, top right, refer to 11 14 080 REMOVING AND INSTALLING TIMING CASE COVER, TOP LEFT (M62 VANOS FROM 9/98) .

NOTE: When unfastening screw connection on camshaft, brace camshaft on hex head.

CAUTION: Do not damage the cylinder head.
If necessary, machine open-end wrench accordingly.

Fig 5: Bracing Camshaft On Hex Head

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Release sprocket on right inlet camshaft (cylinder bank 1 to 4).

Fig 6: Releasing Sprocket On Right Inlet Camshaft

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Fit special tool 11 2 445 / 441 to camshafts on cylinder bank 1 to 4.

Fig 7: Fitting Special Tool 11 2 445 / 441 To Camshafts On Cylinder Bank 1 To 4

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Align camshaft with open-end wrench in such a way that special tool 11 2 441 / 445 locates flush against the cylinder head.

CAUTION: Do not damage the cylinder head.

Fig 8: Aligning Camshaft With Open-End Wrench

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Fit special tool 11 2 443 to special tool 11 2 445 / 441 and secure with special tool 11 2 444 using the spark plug thread.

Fig 9: Fitting Special Tool 11 2 443 To Special Tool 11 2 445 / 441 And Secure With Special Tool 11 2 444

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Release sprocket on left inlet camshaft (cylinder bank 5 to 8).

Fig 10: Releasing Sprocket On Left Inlet Camshaft

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Fit special tool 11 2 446 / 442 to camshafts on cylinder bank 5 to 8.

Fig 11: Fitting Special Tool 11 2 446 / 442 To Camshafts On Cylinder Bank 5 To 8

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Align camshaft with open-end wrench in such a way that special tool 11 2 442 / 446 locates flush against the cylinder head.

CAUTION: Do not damage the cylinder head.

Fig 12: Aligning Camshaft With Open-End Wrench

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Fit special tool 11 2 443 to special tool 11 2 446 / 442 and secure with special tool 11 2 444 using the spark plug thread.

Fig 13: Fitting Special Tool 11 2 443 To Special Tool 11 2 446 / 442 And Secure With Special Tool 11 2 444

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Remove loosened central screw and lift out hub for vibration damper,

CAUTION: Do not turn engine any more.

Remove special tool 11 2 300.

Fig 14: Removing Special Tool 11 2 300

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Remove upper oil sump section, refer to 11 13 010 REMOVING AND INSTALLING/REPLACING UPPER SECTION OF OIL PAN (M62) .

Remove water pump with thermostat housing, refer to 11 51 000 REMOVING AND INSTALLING/REPLACING WATER PUMP (M62 / S62) .

Remove timing case cover, bottom, refer to 11 14 110 REMOVING AND INSTALLING TIMING CASE COVER, BOTTOM (M62 VANOS FROM 9/98) .

Remove sprockets from intake camshaft.

Remove timing chain.

Fig 15: Removing Sprockets From Intake Camshaft

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If necessary, remove tensioning rail.

Release securing screw on tensioning rail, remove tensioning rail with oil guide.

Fig 16: Releasing Securing Screw On Tensioning Rail

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If necessary, remove reversing rail.

Unfasten grub screw (1).

Release securing screw on reversing rail and remove reversing rail.

Fig 17: Unfastening Grub Screw

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If necessary, remove guide rail.

First loosen screw (2) for oil separator.

Release screws (1 and 3), remove guide rail.

Fig 18: Releasing Screws (1 And 3)

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