11 31... Service solution - replacing intake camshaft (N20)

Special tools required:

WARNING: Risk of injury in event of incorrect use.

IMPORTANT: Improper handling. Risk of damage!

Necessary preliminary tasks:

Removal:

NOTE: Injector shafts shown removed for purposes of clarity.

IMPORTANT: Secure eccentric shaft (1) with open-end spanner (3) (risk of return stroke).

Fig 1: Adjusting Eccentric Shaft Using Hexagon Socket Wrench And Open-End Spanner

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Slowly adjust eccentric shaft (1) to minimum lift via servomotor using 4-mm hexagon socket wrench (2) and open-end spanner (3).

Release bolt (1) on the oil spray nozzle.

Tightening torque 11 37 4AZ .

Unclip oil spray nozzle (2) from the bracket on the actuator drive (3) in direction of arrow.

Fig 2: Removing Oil Spray Nozzle From Actuator Drive Bracket

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Position special tool 11 7 110 on return spring (1) (see arrows).

Fig 3: Positioning Special Tool (11 7 110) On Return Spring

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WARNING: Risk of injury in event of incorrect use.

IMPORTANT: Improper handling. Risk of damage!

Place special tool 11 7 110 flat on cylinder head.

Fig 4: Turning Knurled Screw

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Turn knurled screw (1) in direction of arrow until both clamping levers secure return spring in gate.

Return spring is correctly preloaded when both clamping levers are parallel to guide block.

Fig 5: Identifying Preloaded Return Spring

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IMPORTANT: Risk of damage!

Left and right return springs (1) must be positioned in lateral guide of special tool 11 7 110 .

Fig 6: Positioning Return Springs In Lateral Guide Of Special Tool (11 7 110)

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Preload return spring with lever (1) on special tool 11 7 110 in direction of arrow.

Fig 7: Preloading Return Spring With Lever On Special Tool (11 7 110)

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Lock special tool 11 7 110 with catch on lever (1).

IMPORTANT: Screw connection on throttle return spring can only be released with secured special tool 11 7 110 .

Fig 8: Locking Special Tool (11 7 110) With Catch On Lever

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Release screw (1).

Fig 9: Releasing Screw

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WARNING: Risk of injury in event of incorrect use.
Lever (1) is preloaded.

IMPORTANT: Improper handling. Risk of damage!

Secure lever (1).

Press back latching hook (2).

Fig 10: Identifying Latching Hook And Lever

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Return spring tension can now be released.

Release knurled screw (1) on special tool 11 7 110 in direction of arrow.

Fig 11: Releasing Knurled Screw On Special Tool (11 7 110)

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Release special tool from return spring (1) 11 7 110 in direction of arrow.

Fig 12: Releasing Special Tool (11 7 110) From Return Spring

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Return springs (1) remain on the engine.

Fig 13: Identifying Return Springs

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NOTE: All bearing caps are identified with numbers from 1 to 4.

The front bearing cap is a thrust bearing and does not have an identification.

Release screws on all bearing caps (1 to 10).

Set down all bearing caps in a tidy and orderly fashion on special tool 11 4 481 .

Fig 14: Right Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence (N20)

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IMPORTANT: Do not remove intermediate levers (2). Mixing up the intermediate levers (2) will cause the engine to suffer idle-speed fluctuations.

Remove intake camshaft.

Fig 15: Identifying Intermediate Levers

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Installation:

IMPORTANT: Marks of intake and exhaust camshafts are different.
Mixing up the intake and exhaust camshaft will result in engine damage .
A Exhaust camshaft.
E Intake camshaft

Fig 16: Identifying Intake And Exhaust Camshafts Marks

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Insert intake camshaft so that data code (1) on mounting flats points upwards.

Fig 17: Identifying Camshaft Data Code

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Position intake camshaft so that cams point downward at an angle and to the left.

Fig 18: Positioning Intake Camshaft With Cams Pointing Downward At Angle Toward Left

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NOTE: All bearing caps are identified with numbers from 1 to 4.

The front bearing cap is a thrust bearing and does not have an identification.

Insert screws on all bearing caps from (10) to (1).

Tightening torque 11 31 3AZ .

Fig 19: Right Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence (N20)

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Position special tool 11 7 110 on return spring.

Fig 20: Releasing Special Tool (11 7 110) From Return Spring

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Clamp throttle return spring with knurled screw (1) in direction of arrow.

Fig 21: Clamping Throttle Return Spring With Knurled Screw

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Return spring (1) is positioned correctly when latching hooks surround return spring (1).

Fig 22: Positioning Return Spring

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WARNING: Risk of injury in event of incorrect use.

IMPORTANT: Improper handling. Risk of damage!
Check return spring on intermediate lever to ensure correct installation position.

Press special tool 11 7 110 to stop in direction of arrow.

Fig 23: Pressing Special Tool (11 7 110)

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Install return spring (2) on gate.

IMPORTANT: Insert return spring (2) in intermediate lever (1) (see arrow).
Check that rocker arm (3) is in correct installation position.

Fig 24: Inserting Return Spring In Intermediate Lever

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IMPORTANT: Check that intermediate lever (1) is installed in correct position on eccentric shaft (2).

Fig 25: Identifying Intermediate Lever And Eccentric Shaft

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IMPORTANT: Observe thread on cylinder head. Risk of damage!

Tighten bolt (1).

Tightening torque 11 37 2AZ .

Fig 26: Releasing Screw

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WARNING: Risk of injury in event of incorrect use.
Lever (1) is preloaded.

IMPORTANT: Improper handling. Risk of damage!

Secure lever (1).

Press back latching hook (2).

Return spring tension can now be released.

Fig 27: Identifying Latching Hook And Lever

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Check installation position of intermediate lever and return spring again, remove special tool 11 7 110 .

Retract oil spray nozzle (2) on actuator drive (3).

Engage bolt (1) and release back to 90°.

For exact positioning of the oil spray nozzle (2) audibly clip it in at the top.

Tightening torque 11 37 4AZ .

Fig 28: Removing Oil Spray Nozzle From Actuator Drive Bracket

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Required follow-up work:

Install INTAKE ADJUSTER .

Adjust VALVE TIMING .

Fit CYLINDER HEAD COVER .

Install DME CONTROL UNIT .