11 31 005 Checking camshaft timing (B48, B46)

Special tools required: 

• 2 288 380
• 11 6 480
• 2 358 122

Necessary preliminary tasks: 

• Remove CYLINDER HEAD COVER 
• Remove SPARK PLUGS
• Remove FRONT RIGHT WHEEL ARCH PANEL

Adherence to NOTES ON CHECKING AND ADJUSTING TIMING  is mandatory!

If the crankshaft is disconnected properly, it is not possible to turn the engine forwards or backwards on the vibration damper!

Vehicles with manual transmission: 

Dimension (x) = 56 mm.

Insert the special tool 2 288 380 up to dimension (X) into the dowel hole.

Fig 1: Inserting Special Tool (2 288 380) To Dimension Into Dowel Hole

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Vehicles with manual transmission: 

Special tool 2 288 380 correctly positioned.

The engine is located at the first cylinder at top dead center.

Fig 2: Special Tool (2 288 380) Correct Position

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Vehicles with manual transmission: 

Special tool 2 288 380 incorrectly positioned.

The TDC setting of the first cylinder has not been achieved.

Fig 3: Special Tool (2 288 380) Incorrect Position

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Vehicles with automatic transmission: 

Dimension (Y) = 66 mm.

Insert the special tool 2 288 380 up to dimension (Y) into the dowel hole.

Fig 4: Inserting Special Tool (2 288 380) Into Dowel Hole

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Vehicles with automatic transmission: 

Special tool 2 288 380 correctly positioned.

The engine is located at the first cylinder at top dead center.

Fig 5: Special Tool (2 288 380) Correct Position

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Vehicles with automatic transmission: 

Special tool 2 288 380 incorrectly positioned.

The TDC setting of the first cylinder has not been achieved.

Fig 6: Special Tool (2 288 380) Incorrect Position

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Crank engine with special tool 11 6 480 to TDC firing position of cylinder 1.

Fig 7: Cranking Engine With Special Tool (11 6 480) To TDC Firing Position Of Cylinder 1

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Remove protective cap (1) on oil sump.

Fig 8: Protective Cap Of Oil Sump

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Crank engine at central bolt with special tool 11 6 480 .

Fig 9: Cranking Engine At Central Bolt With Special Tool (11 6 480)

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Block crankshaft in cylinder 1 TDC firing position with special tool 2 288 380 .

The markings (1) on the intake and exhaust camshafts can be read from above.

Fig 10: Mark On Intake And Exhaust Camshafts

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The middle one  of the three flat sections (1) on the intake and exhaust camshafts must point upwards.

Fig 11: Flat Sections On Intake And Exhaust Camshafts

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The cam on the exhaust camshaft (A) on the first cylinder points obliquely inwards to the right.

Fig 12: Checking Cam On Exhaust Camshaft On First Cylinder Points (Right)

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The cam on the intake camshaft (E) on the first cylinder points obliquely to the left.

Fig 13: Checking Cam On Intake Camshaft On First Cylinder Points (Left)

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Fig 14: Special Tool (2 358 122) Related Components

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Secure basic carrier (1) by screws (2) on cylinder head.

Position gauge (3) with recess on mounting flats of exhaust camshaft.

Secure basic carrier (3) by screws (5) on basic carrier.

Position gauge (4) with recess on mounting flats of intake camshaft.

Fig 15: Positioning Gauge With Recess On Mounting Flats Of Intake Camshaft

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Secure gauge (4) by screws (5) on basic carrier.

If necessary, adjust VALVE TIMING .