11 36 042 Removing and installing/replacing inlet adjustment unit (N14)

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: Mount special tool 11 9 550 to open central bolts on adjustment units and camshafts.

The timing is not determined at firing TDC of cylinder no. 1.

Modified procedure for timing adjustment.

All pistons are in the 90° position.

Check locking of adjustment units.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .

Slide in special tool 11 9 590 in direction of arrow.

Rotate flywheel (1) at central bolt until firing TDC position at 1st cylinder is reached.

IMPORTANT: The TDC bore can be mixed up in automatic transmissions.

Fig 1: Identifying Special Tool (11 9 590)

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IMPORTANT: Check locking on VANOS adjustment unit.

Attempt to rotate inlet camshaft in direction of rotation at hexagon head.

The adjustment unit is locked in the initial position when the camshaft is non-positively connected to the adjustment unit.

If no fixed connection to the camshaft can be established, the adjustment unit is faulty and must be replaced.

Crank engine at central bolt in direction of rotation until designations (IN and EX) can be read from above.

Fig 2: Identifying Designations For Inlet Camshaft (IN) And Exhaust Camshaft (EX)

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Position special tool 11 9 551 on exhaust camshaft and secure with special tool 11 9 552.

Before fitting special tool, check locking on adjustment unit.

Position special tool 11 9 551 on inlet camshaft and secure with both screws.

Fig 3: Positioning Special Tool (11 9 551) On Intake And Exhaust Camshafts

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Release chain tensioner (1) (have a cleaning cloth ready).

Tightening torque: 11 31 4AZ .

Fig 4: Identifying Chain Tensioner

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Release screw (1).

Fig 5: Identifying Screw

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Release screws (2).

Remove slide rail (1).

Fig 6: Identifying Slide Rail With Screws

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IMPORTANT: Release and secure central bolts with special tool 11 9 550 only.

Release central bolt (3).

Remove VANOS adjustment unit (1) from timing chain (2).

VANOS adjustment unit of inlet camshaft is marked with the letters IN.

Fig 7: Identifying VANOS Adjustment Unit, Timing Chain And Central Bolt

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Install slide rail (1).

Insert screws (2).

Tightening torque: 11 31 2AZ .

Fig 8: Identifying Slide Rail With Screws

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Screw special tool 11 9 340 into cylinder head.

Pretension timing chain with special tool to 0.4 Nm .

Fig 9: Installing Special Tool (11 9 340) Into Cylinder Head

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Installation:

Installation position of adjustment unit can be freely selected.

Secure central bolt (1) with special tool 00 9 120 .

Tightening torque: 11 36 1AZ .

Fig 10: Securing Central Bolt Using Special Tool (00 9 120)

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Fit CHAIN TENSIONER .

Check TIMING .

Assemble engine.