11 31 505 Adjusting camshaft timing (M52TU / M54 / M56)

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Special tools required:

NOTE: For special tools, refer to ENGINE - SPECIAL TOOLS .

00 9 250
11 2 300
11 3 240
11 3 244
11 3 292
11 4 220
11 5 180
11 6 150
(refer to OPERATION NO. 11 31 005 )

Before carrying out adjustment work:

Check camshaft timing.

Crank engine in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.

Fig 1: Identifying Cam Tips

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Secure crankshaft with special tool 11 2 300 in TDC position of 1st cylinder.

X3 only:

Secure crankshaft with special tool 11 5 180 in TDC position of 1st cylinder.

IMPORTANT: Do not turn the engine back.

Remove special tools 11 2 300/11 5 180 before starting engine.

Fig 2: Identifying Special Tool 11 2 300

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Unscrew studs.

Fig 3: Unscrewing Studs

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Remove double VANOS adjustment unit.

Press down top of chain tensioner and lock off with special tool 11 3 292.

Fig 4: Pressing Down Top Of Chain Tensioner And Lock Off With Special Tool

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IMPORTANT: Cylinder for chain tensioning piston is under spring pressure.

Remove cylinder for chain tensioning piston.

Fig 5: Removing Cylinder For Chain Tensioning Piston

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Install special tool 11 4 220.

Fig 6: Installing Special Tool 11 4 220

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Fit adjusting screw to bow cover.

Release screws (1) by half a turn.

Fig 7: Releasing Screws

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Release nuts (2) by two turns.

Release nuts (3) by one turn.

Fig 8: Releasing Nuts

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IMPORTANT: Toothed shaft (4) slips very easily from splines.

Pull out toothed shaft (4) until approx. 1 mm of splines can be seen.

Fig 9: Pulling Out Toothed Shaft

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Withdraw toothed shaft (5) up to stop.

Fig 10: Removing Toothed Shaft

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Fit special tool 11 3 240 to camshafts on cylinder 6. Align camshafts so that special tool 11 3 240 rests without gaps on cylinder head.

Fig 11: Fitting Special Tool 11 3 240

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Attach special tool 11 3 244 to special tool 11 3 240 and locate by way of spark plug thread.

Fig 12: Attaching Special Tools 11 3 244 And 11 3 240

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Press down chain tensioner at top and remove special tool 11 3 292.

Fig 13: Pressing Down Chain Tensioner At Top And Removing Special Tool

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Preload tensioning rail with special tool 11 4 220 by rotating adjusting screw with special tool 00 9 250 or standard torque wrench to 0.7 Nm.

Fig 14: Identifying Special Tools 11 4 220 And 00 9 250

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Preload cup spring slightly by pressing on sensor gear (1) and tighten nuts by hand.

IMPORTANT: Do not tighten down nuts fully.

Fig 15: Identifying Sensor Gear

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Remove gasket.

Check dowel sleeves (1) for damage and correct installation position.

Keep sealing face clean and free of oil.

Fig 16: Checking Dowel Sleeves

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IMPORTANT: Fit special tool 11 6 150 "without gasket" only. If gasket remains underneath special tool 11 6 150, camshaft timing will be "incorrectly" set.

Attach special tool 11 6 150 "without gasket", tighten nuts by hand and then tighten down uniformly until special tool 11 6 150 is in full contact with cylinder head.

Fig 17: Attaching Special Tool 11 6 150

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Insert screws (1) on exhaust side and initially tighten to approx. 5 Nm.

Fig 18: Inserting Screws On Exhaust Side

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Initially tighten nuts (2) on exhaust side and nuts (3) on inlet side to approx. 5 Nm.

Fig 19: Tightening Nuts On Exhaust Side

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Tighten down screws (1) on exhaust side.

Fig 20: Tightening Down Screws On Exhaust Side

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Tightening torque, refer to 11 31 3AZ in ENGINE - TIGHTENING TORQUES .

Tighten down nuts (2) on exhaust side and nuts (3) on inlet side.

Fig 21: Tightening Down Nuts On Exhaust Side

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Tightening torque, refer to 11 31 11AZ in ENGINE - TIGHTENING TORQUES .

Pull special tool 11 2 300/11 5 180 back until flywheel is no longer secured.

Fig 22: Pulling Special Tool 11 2 300

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Remove special tool 11 3 244 and special tool 11 3 240.

Fig 23: Removing Special Tool 11 3 244 And 11 3 240

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Crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.

Fig 24: Identifying Cam Tips

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Secure crankshaft in firing TDC position with special tool 11 2 300.

X3 only:

Secure crankshaft with special tool 11 5 180 in TDC position of 1st cylinder.

IMPORTANT: Do not turn the engine back. Remove special tools 11 2 300/ 11 5 180 before starting engine.

Fig 25: Removing Special Tools 11 2 300

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Fit special tool 11 3 240 to camshafts.

Fig 26: Fitting Special Tool 11 3 240

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NOTE: The timing is correctly set if the special tool 11 3 240 rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side.

The timing must be reset if the special tool 11 3 240 protrudes to the exhaust side.

Fig 27: Identifying Special Tool 11 3 240

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Unfasten and remove special tool 11 4 220.

Fig 28: Removing Special Tool 11 4 220

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Install cylinder for chain tensioning piston.

Fig 29: Installing Cylinder For Chain Tensioning Piston

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Remove special tool 11 2 300/11 5 180.

Fig 30: Removing Special Tool 11 2 300

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Remove special tool 11 6 150.

Fig 31: Removing Special Tool 11 6 150

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Install VANOS adjustment unit.

Assemble engine.