11 31 005 Checking Camshaft Timing (S54)

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Special Tools Required:

11 2 300
11 5 100
11 7 130
11 9 140
12 6 050
12 6 410
12 6 411

Remove fan clutch with fan cowl. Refer to 11 52 020 REMOVING AND INSTALLING/REPLACING FAN CLUTCH (S52 / S54 / M52 / M52TU / M54 / M56) .

Remove cylinder head cover. Refer to 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (S54) .

Remove all spark plugs.

When the engine is switched off, VANOS moves the camshafts to a position which is advantageous to engine starting.

CAUTION: The timing must "not" be checked in this position. The camshafts must first be turned back to their initial position.

Attach special tool 11 5 100 to four screws of crankshaft hub.

Fig 1: Attaching Adapter With Socket Wrench To Crankshaft Hub

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Rotate crankshaft in direction of rotation as far as firing TDC position of 1st cylinder.

Fig 2: Aligning Crankshaft To Firing TDC Position Of 1st Cylinder

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CAUTION: Do not turn the engine back.

Rotate crankshaft in direction of rotation as far as ignition TDC-J position of cylinder 1. Secure vibration damper in position with special tool 11 2 300.

Fig 3: Securing Vibration Damper In Position With Special Tool

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Detach bracket of oil line from timing case cover.

Fig 4: Identifying Oil Line Bracket

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Remove oil line from VANOS adjustment unit.

Fig 5: View Of Oil Line From VANOS Adjustment Unit

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Fit special tool 11 7 130 to VANOS adjustment unit.

Connect compressed air (2 to 8 bar).

Fig 6: Installing Special Tool To VANOS Adjustment Unit

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Disconnect plug connection on solenoid valve.

Fig 7: Disconnecting Plug Connection On Solenoid Valve

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Connect special tool 12 6 050 in conjunction with special tool 12 6 411 (from special tool kit 12 6 410) to solenoid valves. Connect special tool 12 6 411 to correct terminals on car battery.

Alternately press toggle switch buttons 1 and 2 several times on special tool 12 6 050.

Fig 8: View Of Switching Unit

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Press and hold down toggle switch button 1 on special tool 12 6 050.

At same time, rotate inlet camshaft at hexagon drive against direction of rotation as far as it will go.

Fig 9: Identifying Inlet Camshaft

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NOTE: Spline teeth in VANOS gear are engaged; and inlet camshaft cannot be rotated further.

Alternately press toggle switch buttons 3 and 4 several times on special tool 12 6 050.

Fig 10: Locating Toggle Switch Buttons On Switching Unit

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Press and hold down toggle switch button 3 on special tool 12 6 050.

At same time, rotate exhaust camshaft at hexagon drive against direction of rotation as far as it will go.

Fig 11: View Of Exhaust Camshaft

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NOTE: Spline teeth in VANOS gear are engaged; and exhaust camshaft cannot be rotated further.

Disconnect compressed air from special tool 11 7 130.

Remove special tool 11 7 130.

Fig 12: Identifying Connection Piece In VANOS Unit

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Check camshaft setting:

Attach special tool 11 9 140 and join in locating bore of inlet camshaft.

NOTE: The inlet camshaft is correctly adjusted when special tool 11 9 140 rests flat on the cylinder head or protrudes by max. 0.5 mm to the exhaust side.

If the special tool 11 9 140 protrudes to the inlet side, the timing must be readjusted.

Fig 13: Identifying Gauge (Special Tool 11 9 140)

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Join special tool 11 9 140 in locating bore of exhaust camshaft.

NOTE: The exhaust camshaft is correctly adjusted when special tool 11 9 140 rests flat on the cylinder head or protrudes by max. 0.5 mm to the exhaust side.

If the special tool 11 9 140 protrudes to the inlet side, the timing must be readjusted.

If necessary, adjust camshaft timing. Refer to 11 31 505 ADJUSTING CAMSHAFT TIMING (S54) .

Fig 14: View Of Gauge In Locating Bore Of Exhaust Camshaft

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Replace sealing rings of banjo bolt.

Install banjo bolt but do not tighten down yet.

Fig 15: Installing Banjo Bolt

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Install bracket of oil line. Install screw and tighten down.

Fig 16: Installing Bracket Of Oil Line

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Tighten down banjo bolt of oil line.

Tightening torque, refer to 11 36 9AZ in ENGINE - TIGHTENING TORQUES .

Fig 17: Identifying Banjo Bolt Of Oil Line

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Remove special tool 11 2 300.

Assemble engine.

Fig 18: Removing Special Tool From Vibration Damper

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CAUTION: There is air in the VANOS system once it is opened. In the first few seconds after startup this results in a clearly discernible "rattling noise". This rattling noise does "not" indicate incorrect assembly. The rattling noise will disappear as soon as the oil pressure has built up and the system has vented.