Removing and installing/replacing exhaust camshaft (B48A/B46A) (Cooper S and John Cooper Works)

Special tools required:

11 4 480
11 9 000

Preliminary work needed:

Remove EXHAUST CAMSHAFT ADJUSTER .

Removal:

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

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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 1: Bearing Caps Screws Loosening Sequence

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Remove roller tappet (1).

Remove high-pressure pump bracket (2).

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Take exhaust camshaft (1) out of 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 aluminum strip.

Moisten all bearing positions (1) with motor oil.

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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 motor oil.

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

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

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

Position all bearing shells on cylinder head.

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

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Installation note:

Check the tensile strength of the screws for the bearing caps.

The illustration shows the screw with a tensile strength of 8.8.

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Installation note:

Check the tensile strength of the screws for the bearing caps.

The illustration shows the screw with a tensile strength of 10.9.

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

Position the high pressure pump carrier on the cylinder head.

Press down on the bearing caps and hand tighten the screws incrementally in the sequence 1 - 10.

Join the screws in the sequence 1 - 10 in half turns.

Observe the joining torque 11 31 1AZ .

Tighten all screws in the sequence 1 - 10.

Tightening torque 11 31 1AZ .

Fig 2: Bearing Caps Screws Tightening Sequence

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

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Required follow-up work:

Install EXHAUST CAMSHAFT ADJUSTER .
Adjust VALVE TIMING .
Assemble engine