11 31 001 Replacing camshaft (M52TU / M54 / M56): Installation

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2006 BMW 325Ci, 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, and 2004 BMW 325xi. However, it is still accessible from the selected car via links, so may be relevant.

Installation of camshafts is described separately from removal. The assembly sequence for removal and installation is different.

NOTE: Camshafts, bearings and bearing caps, friction washers, all splines on toothed shafts and spline hubs must be oiled before installation.

IMPORTANT: The bucket tappets expand when not subjected to load by the camshaft and therefore require some time before they can be pushed back down. During a rapid assembly sequence, the "closed" valves may still be open and be in contact with the piston.

Comply with following waiting periods after installing camshaft and before cranking engine back to TDC position.

Room temperature (20°C) 4 mins
10 °C...20°C 11 mins
0 °C...10°C 30 mins

Pull up timing chain and feed in exhaust camshaft.

Position timing chain on exhaust camshaft.

Fig 1: Positioning Timing Chain On Exhaust Camshaft

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Install camshafts so that cam tips on inlet and exhaust valves on 1st cylinder face one another.

Fig 2: Installing Camshafts

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Fit bearing cover.

Fig 3: Fitting Bearing Cover

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NOTE: Bearing caps are marked from exhaust side:

A1...A7 for exhaust side
E1...E7 for inlet side

Fit special tool 11 3 260 to cylinder head and screw into spark plug threads in cylinders 1 and 4.

Fig 4: Fiting Special Tool 11 3 260 To Cylinder Head And Screwing Into Spark Plug Threads In Cylinders 1 And 4

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Turn the eccentric shaft to tension the bearing caps.

Fig 5: Turning The Eccentric Shaft To Tension The Bearing Caps

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Tighten down bearing cover.

Tightening torque, refer to 11 31 1AZ in ENGINE - TIGHTENING TORQUES .

Remove special tool 11 3 260.

IMPORTANT: Do not damage the cylinder head. If necessary, machine open-end wrench accordingly.

Align camshafts with open-end wrench.

Fig 6: Aligning Camshafts With Open-End Wrench

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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 7: Identifying 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 8: Attaching Special Tool 11 3 244 And 11 3 240

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Lift timing chain and hold under tension.

Fig 9: Lifting Timing Chain And Hold Under Tension

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Turn engine from 30° before TDC position in direction of rotation as far as TDC position.

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

IMPORTANT: Remove special tool 11 2 300 before starting engine.

Fig 10: Removing Special Tool 11 2 300 Before Starting Engine

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Automatic transmissions only:

Illustration does not show automatic transmission.

IMPORTANT: On engines with automatic transmissions, there is shortly before the special tool bore (1) a large bore (2) which can be confused with the special tool bore.

Fig 11: Identifying Special Tool Bore And Large Bore

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If special tool 11 2 300 is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.

Position sensor gear on inlet camshaft.

Fig 12: Positioning Sensor Gear On Inlet Camshaft

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Fit thrust washer and tighten down with dowels.

Fig 13: Fitting Thrust Washer

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

Feed chain wheel onto timing chain so that arrow on chain wheel faces separating face of upper side of cylinder head.

Fig 14: Feeding Chain Wheel Onto Timing Chain

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Insert special tool 11 4 220 in cylinder head and bring adjustment screw into contact with tensioning rail, but do not pretension timing chain yet.

Check arrow on chain wheel to separating face of upper side of cylinder head, reposition chain wheel if necessary.

Fig 15: Inserting Special Tool 11 4 220

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Insert and tighten down screw-in pin.

Fig 16: Inserting And Tighten Down Screw-In Pin

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

Install secondary chain tensioner.

Fig 17: Installing Secondary Chain Tensioner

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Fit toothed sleeve (6) and align to toothed shaft in camshaft so that tooth gaps are opposed.

Fig 18: Fitting Toothed Sleeve And Align To Toothed Shaft

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Secure toothed shaft (5).

Insert pin of toothed shaft (5) into tooth gaps of splines on camshaft and toothed sleeve (6).

Fig 19: Inserting Pin Of Toothed Shaft

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Push in toothed shaft (5) until the longitudinal holes in the toothed sleeve (6) are positioned centrally with respect to the thread.

Fig 20: Pushing In Toothed Shaft Until Longitudinal Holes

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Place chain wheels in special tool 11 6 180, position tooth gap on inlet chain wheel as shown in illustration and feed on chain.

Fig 21: Identifying Special Tool 11 6 180

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IMPORTANT: Do not alter position of chain wheels with respect to chain when removing from special tool 11 6 180.

Remove chain with sprocket wheels positioned from special tool 11 6 180 and so that tooth spaces oppose each other on inlet side.

Fig 22: Removing Chain With Sprocket Wheels

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Align chain with sprocket wheels so that tooth spaces are positioned exactly over each other on inlet side.

Fig 23: Aligning Chain With Sprocket Wheels

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Secure toothed shaft (4).

Insert pin of toothed shaft (4) into tooth gaps of splines on camshaft and chain wheel.

Fig 24: Inserting Pin Of Toothed Shaft

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Push in toothed shaft (4) until approx. 1 mm of splines can still be seen.

Fig 25: Pushing In Toothed Shaft

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Note installation direction of corrugated washer (7), "FRONT" lettering must be visible.

Install corrugated washer, tighten nuts by hand but do not tighten down fully yet.

Fig 26: Installing Corrugated Washer

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Insert screws on exhaust side, initially tighten to approx. 5 Nm and then slacken off again half a turn.

Fig 27: Inserting Screws On Exhaust Side

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Fit thrust washer (3).

Fig 28: Fitting Thrust Washer

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Note installation direction of cup spring (2), "F" lettering must be visible.

NOTE: If "F" lettering is no longer visible on an engine that has been run: Install cup spring (2) so that small locating diameter of spring (2) points to sensor gear.

Fit cup spring (2) in position.

Fig 29: Fitting Cup Spring In Position

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Position sensor gear (1) so that arrow on sensor gear faces separating face of upper side of cylinder head.

Install nuts and tighten by hand but do not tighten down fully yet.

Fig 30: Installing Nuts

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Withdraw toothed shaft (5) up to stop.

Fig 31: Identifying Toothed Shaft

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

Fig 32: Pressing Down Secondary Chain Tensioner

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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 33: 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 34: Pressing On Sensor Gear And Tighten Nuts

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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 35: 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 36: Fitting Special Tool 11 6 150