11 31 052 Replacing both timing chains (B36A/B38A)

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Special tools required:

Necessary preliminary tasks:

Remove ENGINE with transmission.
Remove transmission. See REMOVING AUTOMATIC TRANSMISSION or REMOVING MANUAL TRANSMISSION .
Mount engine on ASSEMBLY STAND .
Remove FLYWHEEL .
Remove CYLINDER HEAD .
Remove OIL PUMP .
Remove REAR TIMING CASE COVER .

Removal:

Remove drive chain (1) for oil pump.

Fig 1: Oil Pump Drive Chain

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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.

Fig 2: Tensioning Rail, Bearing Journal, And Camshaft Timing Chain

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

Fig 3: Securing Crankshaft

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Position crankshaft with guide pin (see arrow). Position special tool 2 357 904 with screw (2) at the crankcase.

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

Press piston (1) for chain tensioner in as far as the limit position with screwdriver (2) and secure with special tool 11 4 120 .

Loosen screws (3). Remove chain tensioner.

Fig 4: Pressing Piston For Chain Tensioner

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Undo both bearing journals (1).

Remove guide rail (2).

Release bearing journal (4).

Remove tensioning rail (3).

Fig 5: Removing Tensioning Rail

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Remove screw and camshaft sprocket (1).

Fig 6: Camshaft Sprocket Screw

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Remove special tool 2 357 904 . Remove timing chain (1).

Fig 7: Removing Timing Chain

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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.

Fig 8: Removing Tensioning Rail

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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).

Fig 9: Removing Tensioning Rail

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Tightening torque: 11 11 3AZ .

Position tensioning rail (3).

Screw in bearing journals (4).

Tightening torque: 11 11 3AZ .

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

Fig 10: Locating Sealing Surfaces

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Install hydraulic chain tensioner. Tighten down screws (3).

Tightening torque: 11 11 7AZ .

Fig 11: Pressing Piston For Chain Tensioner

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Secure piston (1) for chain tensioner with screwdriver (2)

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

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 .

Fig 12: Securing Crankshaft

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

Fig 13: Tensioning Rail, Bearing Journal, And Camshaft Timing Chain

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

Fig 14: Oil Pump Drive Chain

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