11 31 025 Removing and installing/replacing intake camshaft (B48AO0)

Special tools required:

Necessary preliminary work:

Removal:

NOTE: The bearing caps are legibly labelled with (E1 - E4) on the intake side.
Bearing cap (E) is a thrust bearing.

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Release all screws on bearing caps 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: Main Bearing Caps Screws Loosening Sequence

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Take intake camshaft (1) out of cylinder head.

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Installation:

Moisten all bearing positions (1) with engine oil.

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Engage intake camshaft in cylinder head so that data code (1) is pointing upwards.

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NOTE: Check adapter sleeves (1) for damage and firm seating.

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Coat intake camshaft and bearing shells with engine oil.

Position all bearing shells on cylinder head.

NOTE: The bearing caps are legibly labelled with (E1 - E4) on the intake side.
Bearing cap (E) is a thrust bearing.

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Installation note:

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

The figure shows the screw with the tensile strength of 8.8 .

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Installation note:

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

The figure shows the screw with tensile strength of 10.9 .

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Press down the bearing caps and gradually tighten the screws in the sequence 1-10 so that they are hand-tight.

Join screws in sequence 1-10 in half turns.

Note the tightening torque 11 31 1AZ .

Tighten all screws in sequence from 1 - 10 .

Tightening torque 11 31 1AZ .

Fig 2: Main Bearing Caps Screws Tightening Sequence

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Required follow-up work: