11 31 032 Removing and installing/replacing left inlet camshaft (N62 to 9/03): Installation

Installation of inlet camshaft is described separately from removal.

Clean all bearings and cams of inlet camshaft and lubricate with engine oil.

NOTE: Camshaft has a groove and sensor gear has a lug for fastening purposes.

Fig 1: Identifying Camshaft Groove

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Fit sensor gear (1) and align to groove in camshaft.

Fig 2: Fitting Sensor Gear

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Insert screw (2) and tighten down.

Tightening torque of screw (2), 11 31 14AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installing compression rings (1):

IMPORTANT: Plain compression rings (1) can easily break.

Fig 3: Installing Compression Rings

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Carefully pull compression ring (1) apart and install from front.

Press compression ring (1) on one side into groove, install catch on other side.

Insert inlet camshaft (1) so that cams point upwards at cylinder 5 as shown in illustration.

Fig 4: Inserting Inlet Camshaft

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Make sure bearing shells (1) of eccentric shaft are engaged in bearing bracket.

NOTE: Bearing shell (1) is guided in a groove in bearing cap.

Fig 5: Identifying Bearing Shells

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

Fig 6: Checking Dowel Sleeves

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NOTE: Bearing caps are marked as illustrated with R E2 to R E5.

Fit bearing caps R E2 to R E5.

Fig 7: Fitting Bearing Caps

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NOTE: Initially tighten special tool 11 9 473 without play only.

Fig 8: Securing Bearing Bracket And Bearing Cap

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Secure bearing bracket and bearing cap with nut (special tool 119 473).

NOTE: The mounting of the bearing bracket described later can only be performed if the first bearing of the inlet camshaft is aligned with special tool 119 472.

Fit special tool 119 472 as shown in illustration and align inlet camshaft.

Fig 9: Aligning Inlet Camshaft

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Fit centering sleeves (special tool 11 9 475) and align special tool 11 9 472 to bearing caps 2 and 3.

Fig 10: Fitting Centering Sleeves

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Insert special tool 11 9 474 and initially tighten without play.

Fig 11: Inserting Special Tool (11 9 474)

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NOTE: Special tools 119 472 /119 474 and 119 475 remain fitted until all torsion springs and intermediate levers have been installed.

NOTE: Installation of the intermediate levers and torsion springs is described on the 8th cylinder. The same procedure is applicable to cylinders 5 to 7.

Attach special tool 11 9 490 to ends of torsion spring. Install torsion spring (1).

Fig 12: Installing Torsion Spring

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Insert screw (1) and tighten down.

Fig 13: Inserting Torsion Spring Screw

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IMPORTANT: Intermediate levers (2) are divided into individual tolerance classes.

Fig 14: Identifying Intermediate Lever

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Only intermediate levers of the same tolerance class may be fitted in a single engine.

The tolerance classes are designated as illustrated with the numbers from 1 to 5.

Used intermediate levers (2) may only be reused in the same position.

Lubricate all sliding surfaces on intermediate lever (2) with engine oil.

Raise torsion spring (1) with special tool 11 9 480.

Fig 15: Raising Torsion Spring

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Detach special tool 119 490.

Hold torsion spring (1) with special tool 11 9 480.

Fig 16: Installing Intermediate Lever

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Install intermediate lever (2) from above.

Insert end of torsion spring (1) into guide on intermediate lever (2).

Raise second end of torsion spring with special tool 11 9 480.

Fig 17: Raising Second End Of Torsion Spring

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Detach special tool 119 490.

Hold torsion spring (1) with special tool 11 9 480.

Fig 18: Inserting End Of Torsion Spring Into Guide On Intermediate Lever

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Install intermediate lever (2) from above.

Insert end of torsion spring (1) into guide on intermediate lever (2).

Install eccentric shaft sensor (2).

Fig 19: Installing Eccentric Shaft Sensor

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Insert screws and tighten down eccentric shaft sensor (2).

Remove special tool 119 474.

Fig 20: Removing Special Tool (119 474)

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Remove special tool 11 9 472 and special tool 11 9 475.

Fig 21: Removing Special Tools

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Ends of compression rings (1) point upwards.

Fig 22: Identifying Compression Rings

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Make sure compression rings (1) are engaged at ends.

IMPORTANT: Rocker arms (1) slip slightly when bearing bracket is fitted.

Make sure rocker arms (1) are secured as illustrated on hydraulic valve clearance compensating elements and on valves.

Fig 23: Securing Rocker Arms

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Align rocker arms (1) straight.

Remove special tool 11 9 473.

Fig 24: Removing Bearing Bracket From Special Tool

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Remove bearing bracket (1) from special tool 119 470.

IMPORTANT: Do not tilt bearing bracket (1).

Lower bearing bracket (1) from above and carefully bring into contact with cylinder head.

Fig 25: Lowering Bearing Bracket

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Insert nuts and tighten by hand without play.

IMPORTANT: Make sure none of the intermediate levers or rocker arms have slipped out.

Tighten down nuts from inside to outside.

Tightening torque 11 31 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

IMPORTANT: Do not mix up the camshaft bearing covers of cylinders 1 to 4 and 5 to 8.

Fit bearing cap R E1 in such a way that marking is legible from inlet side.

Fig 26: Fitting Bearing Caps

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Install nuts and tighten down.

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

Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).

Fig 27: Rotating Eccentric Shaft At Dihedral Head

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Pretension torsion spring (1) with a cable strap (2) and carefully fit on roller (3).

Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.

Fig 28: Rotating Eccentric Shaft Back To Minimum Stroke Position

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Rotate inlet camshaft in direction of rotation until cam on 5th cylinder points upwards at an angle as shown in illustration.

Fig 29: Rotating Inlet Camshaft

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Install inlet and exhaust adjustment unit on left side. Refer to 11 36 047 Removing and installing/replacing inlet and exhaust adjustment units on left side (N62) .

Install spark plugs on cylinder bank 5 to 8.

Install left cylinder head cover. Refer to 11 12 005 Removing and installing / sealing left cylinder head cover (N62 / N62TU) .

Install ignition coils on cylinder bank 5 to 8.

Install servomotor for left eccentric shaft. Refer to 11 37 022 Removing and installing/replacing servomotor for left eccentric shaft (N62) .

Assemble engine.