11 31 573 Adjusting camshaft timing on left side (N63)

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Special tools required:

00 9 120
11 8 570
11 9 190
11 9 890
11 9 891
11 9 892
11 9 893
11 9 894

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS .

See ENGINE - SPECIAL TOOLS (N54, N63) .

IMPORTANT: If the bolt head contact faces of the central bolts are not greased, the VANOS gear must be replaced for safety reasons.

Release central bolts on adjustment unit with special tool 11 9 890 only.

Risk of damage to timing drive.

If special tool 11 9 890 cannot be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshaft.

(cylinder bank 5 to 8)

Necessary preliminary tasks:

Remove left timing case cover
Check camshaft timing on left side

Get special tool kit 11 9 890 ready for securing camshafts.

NOTE: Special tool 11 9 891 Knurled screw.

Special tool 11 9 892 Press-down bar.

Special tool 11 9 893 Gap gauge for inlet and exhaust camshafts.

Special tool 11 9 894 Spacer.

Fig 1: Identifying Special Tool Kit

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IMPORTANT: If special tool 11 9 890 cannot be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshaft.

Release central bolts (1 and 2) of inlet and exhaust adjustment units.

Installation:

Replace central bolts after releasing.

Fig 2: Identifying Inlet And Exhaust Camshaft Central Bolts

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IMPORTANT: Check whether head of central bolt (1) is greased (see arrow).

If no grease can be seen on the bolt head of central bolt (1), replace the VANOS gear for safety reasons.

Installation:

Coat contact face of new central bolt (1) with copper paste.

Fig 3: Identifying Central Bolt

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Position special tool 11 9 893 on inlet and exhaust camshafts.

Special tool 11 9 893 must rest without a gap on cylinder head; if necessary, adjust camshaft at hexagon heads.

Screw special tool 11 9 894 into cylinder head.

Fig 4: Positioning Special Tool 11 9 893 On Inlet And Exhaust Camshafts

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Position special tool 11 9 892 on special tool 11 9 893.

Both special tools 11 9 893 are secured with special tool 11 9 891.

NOTE: Tighten down special tool 11 9 891 by hand.

Fig 5: Identifying Special Tool (11 9 892, 11 9 893 And 11 9 891)

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Secure central bolt (1) of right inlet adjustment unit with special tool 00 9 120.

Secure central bolt (2) of right exhaust adjustment unit with special tool 00 9 120.

Tightening torque: 11 36 1AZ, see 11 36 VARIABLE CAMSHAFT CONTROL

Fig 6: Identifying Inlet And Exhaust Camshaft Central Bolts

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Remove special tools 11 9 190 and 11 8 570.

Crank engine at central bolt twice in direction of engine rotation until engine returns to 150° before cylinder no. 1 firing TDC position .

Secure vibration damper with special tool 11 9 190 at 150° before cylinder no. 1 firing TDC position .

Fig 7: Identifying Special Tools Position (11 8 570 And 11 9 190)

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Fit special tool 11 9 893 on exhaust camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

Fig 8: Identifying Special Tool 11 9 893 On Exhaust Camshaft

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Fit special tool 11 9 893 on inlet camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

Fig 9: Identifying Special Tool On Cylinder Head

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Remove all special tools.

Assemble engine.