11 31 573 Adjusting camshaft timing on left side (N74)

Risk of damage  to timing drive.

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

(cylinder bank 7 to 12) 

Necessary preliminary tasks: 

• Remove LEFT TIMING CASE COVER 
• CHECK CAMSHAFT TIMING ON LEFT SIDE 

Get special tool 11 9 890 ready for securing camshafts.

Special tool 11 9 892 Press-down bar.

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

Special tool 11 9 895 spacer.

Fig 1: Identifying Special Tools (11 9 890, 11 9 891, 11 9 892, 11 9 893, 11 9 895)

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

Installation: 

Replace central bolts after releasing.

Illustrations show cylinders 1 to 6.

Fig 2: Identifying Inlet And Exhaust Adjustment Units Central Bolts

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Installation: 

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

Fig 3: Locating Central Bolt Coating Contact Face

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Screw special tool 11 9 895 into cylinder head.

Fig 4: Screwing Special Tool 11 9 895 Into Cylinder Head

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

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

Fig 5: 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 9 891 are secured with special tool 11 9 893.

Fig 6: Identifying Special Tools (11 9 891, 11 9 892)

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Join central bolt (1) of intake adjustment unit (2).

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

Fig 7: Tightening Central Bolt Of Intake Adjustment Unit

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Join central bolt (1) of exhaust adjustment unit (2).

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

Fig 8: Tightening Central Bolt Of Exhaust Adjustment Unit

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Secure central bolt (1) of intake adjustment unit (2) with special tool 00 9 120 .

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

Fig 9: Securing Intake Adjustment Unit Central Bolt Using Special Tool 00 9 120

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Secure central bolt (1) of exhaust adjustment unit (2) with special tool 00 9 120 .

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

Fig 10: Securing Exhaust Adjustment Unit Central Bolt Using Special Tool 00 9 120

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Remove special tool 11 9 890 .

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 TDC firing position for cylinder 1  .

Fig 11: Identifying Special Tools 11 9 190 And 11 8 570

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Secure vibration damper with special tool 11 9 190 at TDC firing position for cylinder 1  .

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

Fig 12: Fitting Special Tool 11 9 893 On Intake Camshaft

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

Fig 13: Fitting Special Tool 11 9 893 On Intake Camshaft

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Remove all special tools.

Assemble engine.