Replacing both timing chains (B36 engine) (Cooper base)

Special tools required: 

• 2 357 904
• 11 4120

Preliminary work needed: 

• Remove ENGINE  with transmission.
• Remove transmission.
  • Vehicles with automatic transmission, refer to REMOVING AND INSTALLING TRANSMISSION (AISIN F21FT)
  • Vehicles with manual transmission, refer to REMOVING AND INSTALLING TRANSMISSION (GS6-58BG) .
• Mount ENGINE ON ASSEMBLY JIG .
• Remove FLYWHEEL .
• Remove CYLINDER HEAD .
• Remove VACUUM PUMP .
• Remove REAR TIMING CASE COVER .

Removal: 

Remove drive chain (1) for the oil pump.

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Remove camshaft timing chain (1).

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

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The crankshaft must be fixed in order to release central bolt (1) of the sprocket wheel.

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 wheel.

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Press in piston (1) for chain tensioner up to the stop using screwdriver (2) and secure it using special tool 11 4 120.

Unscrew the screws (3). Remove chain tensioner.

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Undo both bearing journals (1).

Remove guide rail (2).

Release bearing tappet (4).

Remove tensioning rail (3).

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Remove screw and camshaft wheel (1).

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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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Attention! 

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

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Parts:  Replace bearing journal.

Install camshaft wheel and tighten screw until it makes contact.

Position guide rail (2).

Screw in both bearing journals (1).

Tightening torque: 11 11 3AZ .

Position tensioning rail (3).

Screw in bearing journals (4).

Tightening torque: 11 11 3AZ .

Attention! 

Clean sealing surfaces (1) with compressed air.

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

Tightening torque: 11 11 7AZ .

Secure piston (1) for the chain tensioner using screwdriver (2)

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

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Parts:  Replace central bolt (1).

Tighten central bolt (1) of the camshaft wheel.

Tightening torque: 11 11 4AZ .

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

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

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Required follow-up work: 

• Attach REAR TIMING CASE COVER .
• Install VACUUM PUMP .
• Attach FLYWHEEL .
• Install CYLINDER HEAD .
• Remove engine from ASSEMBLY JIG .
• Attach transmission.
  • Vehicles with automatic transmission, refer to REMOVING AND INSTALLING TRANSMISSION (AISIN F21FT)
  • Vehicles with manual transmission, refer to REMOVING AND INSTALLING TRANSMISSION (GS6-58BG) .
• Install ENGINE  with transmission.