11 31 052 Replacing both timing chains (B48B)

WARNING: This page is about a different car, the 2018 BMW 330i and 2017 BMW 330i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

2 357 904
11 4 120

Necessary preliminary work:

Removal:

Remove drive chain (1) for oil pump.

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Remove camshaft timing chain (1).

Remove tensioning rail (2) from bearing journal (3).

NOTE: Bearing journal (3) does not have to be removed.

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The crankshaft must be secured in order to slacken the central bolt (1) of the camshaft sprocket.

Position crankshaft with guide pin. Fix special tool 2 357 904 with screw (2) in position at the crankcase.

Slacken the central bolt (1) of the camshaft sprocket.

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Use screwdriver (2) to press piston (3) for chain tensioner to limit position and secure piston with special tool 11 4 120 .

Release screws (1). Remove chain tensioner.

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Undo both bearing journals (1).

Remove guide rail (2).

Release bearing journal (4).

Remove tensioning rail (3).

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Release screw (1) and remove camshaft sprocket (2).

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Release screw (2) and remove special tool 2 357 904 .

Remove timing chain (1).

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Installation:

Fit timing chain (1).

Position crankshaft with special tool 2 357 904 .

Fix special tool 2 357 904 with screw (2) in position at the crankcase.

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IMPORTANT: Clean all the threads of the bearing journals (if necessary with screw tap).

Parts: Replace bearing journals.

Install camshaft sprocket and tighten screw until it makes contact.

Position guide rail (2).

Screw in both bearing journals (1).

Tightening torque: 11 11 3AZ .

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Position tensioning rail (3).

Screw in bearing journals (4).

Tightening torque: 11 11 3AZ .

IMPORTANT: Clean sealing surfaces (1) with compressed air.

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Install hydraulic chain tensioner. Tighten down screws (1).

Tightening torque: 11 11 7AZ .

Secure piston (3) for chain tensioner with screwdriver (2)

Remove special tool 11 4 120 and slowly remove screwdriver (2).

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NOTE: The crankshaft must remain secured in order to secure the central bolt (1) of the camshaft sprocket.
Parts: Replace central bolt (1).

Tighten central bolt (1) of the camshaft sprocket.

Tightening torque: 11 11 4AZ .

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Install tensioning rail (2) with timing chain (1) for camshafts.

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Mount drive chain (1) for oil pump on crankshaft.

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Required follow-up work:

Install REAR TIMING CASE COVER
Install OIL PUMP
Mounting the FLYWHEEL
Mounting the CYLINDER HEAD
Remove ENGINE FROM ASSEMBLY STAND
Install ENGINE