11 31 028 Removing and installing/replacing exhaust camshaft (B48/B46)

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Special tools required:

Necessary preliminary tasks:

Remove EXHAUST CAMSHAFT ADJUSTER

Removal:

NOTE: The bearing caps are legibly labelled with (A1 and A2) on the intake side.
The bearing cap (A) is a thrust bearing.

Fig 1: Bearing Caps

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Release all screws in the sequence 10 - 1 in 1/2 turns.

Set down all bearing caps in a tidy and orderly fashion on special tool 11 4 480 .

Fig 2: Exhaust Camshaft Bearing Cap Screws Loosening/Tightening Sequence

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Remove roller tappet (1).

Remove high-pressure pump bracket (2).

Fig 3: High-Pressure Pump Bracket And Roller Tappet

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Take exhaust camshaft (1) out of cylinder head.

Fig 4: Removing Exhaust Camshaft From Cylinder Head

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Installation:

Attention !

Installation on engine:

Set engine to ignition TDC at cylinder No. 1.

Removed cylinder head:

When using special tool 11 9 000 , it will be necessary to remove the aluminium strip.

Moisten all bearing positions (1) with engine oil.

Fig 5: Bearing Positions

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NOTE: Prior to installation of exhaust camshaft, ensure proper installation position of rocker arm (1).

Coat exhaust camshaft and bearing caps with engine oil.

Fig 6: Rocker Arm

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Engage the exhaust camshaft into the cylinder head so that the data code (1) is pointing upwards.

Fig 7: Data Code

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NOTE: Check the fitting sleeves (1) for proper fit and for damage.

Fig 8: Fitting Sleeves

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Coat the exhaust camshaft and the bearing shells with engine oil.

Position all bearing shells on cylinder head.

NOTE: The bearing caps are legibly labelled with (A1 and A2) on the intake side.
The bearing cap (A) is a thrust bearing.

Fig 9: Bearing Caps

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Coat both bearing positions on the high pressure pump carrier with engine oil.

Position the high pressure pump carrier on the cylinder head.

Tighten all screws in the sequence 1 - 10 in 1/2 turns.

Tightening torque 11 31 1AZ .

Fig 10: Exhaust Camshaft Bearing Cap Screws Loosening/Tightening Sequence

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Install the roller tappet (1) in the high pressure pump carrier (2).

Fig 11: High-Pressure Pump Bracket And Roller Tappet

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Required follow-up work:

Adjust VALVE TIMING