11 31 032 Removing And Installing/Replacing Left Inlet Camshaft (N62 From 9/03 And N62TU)

Special tools required:

11 9 470
11 9 472
11 9 473
11 9 474
11 9 475
11 9 480
11 9 490

(cylinder bank 5 to 8)

Necessary preliminary tasks:

Remove servomotor for left eccentric shaft. See 11 37 022 REMOVING AND INSTALLING/REPLACING SERVOMOTOR FOR LEFT ECCENTRIC SHAFT (N62/N62TU) .
Remove ignition coils on cylinder bank 5 to 8
Remove left cylinder head cover. See 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (N62/N62TU) .
Remove spark plugs on cylinder bank 5 to 8
Remove left inlet and exhaust adjustment units . See 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS ON LEFT SIDE (N62/N62TU) .

IMPORTANT: The inlet camshaft must first be rotated so that when the bearing bracket is removed the intermediate levers do not slip out and damage the camshaft.

Rotate inlet camshaft against direction of rotation until lettering (1) on 8th cylinder points upwards in cylinder axis and cam is horizontal.

Fig 1: Identifying Camshaft 8Th Cylinder Points

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IMPORTANT: Camshaft bearing caps of cylinders 1 to 4 and 5 to 8 must not be mixed up.

NOTE: Bearing caps of inlet camshaft are marked on cylinder bank 5 to 8 with R E1 to R E5 from inlet side.

Release nuts and remove bearing cap R E1.

Fig 2: Locating Bearing Cap R E1 Number

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Release 8 nuts of bearing bracket (1) from outside to inside.

Fig 3: Identifying Bearing Bracket

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NOTE: Rocker arms are freely accessible after bearing bracket has been removed.
Do "not" remove rocker arm (1) on inlet side.

IMPORTANT: Rocker arms (1) are divided into individual tolerance classes.
The tolerance classes are designated as illustrated with the numbers from 1 to 4.
Used rocker arms (1) may only be reused in the same position.

When replacing rocker arms (1) on inlet side: install rocker arms of the same tolerance class in the same position.

Fig 4: Identifying Rocker Arms

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Clamp special tool 11 9 470 as illustrated in a vice.

Fig 5: Identifying Special Tool (11 9 470)

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IMPORTANT: Do not tilt bearing bracket (1).

Carefully lift out bearing bracket (1).

Fig 6: Identifying Bearing Bracket

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Place bearing bracket (1) with inlet camshaft and eccentric shaft as illustrated on special tool 11 9 470.

Secure bearing bracket (1) with a nut (special tool 11 9 473).

Fig 7: Identifying Bearing Bracket

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IMPORTANT: The lower section of the bearing bracket (1) is machined with the cylinder head and must not be mixed up.

NOTE: Lower section of bearing bracket (1) remains on cylinder head.

Fig 8: Identifying Lower Section Of Bearing Bracket

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NOTE: This work step will only be necessary if after the inlet camshaft has been removed the eccentric shaft is also to be removed.

If necessary, remove eccentric shaft sensor (2).

Fig 9: Identifying Eccentric Shaft Sensor

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

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

Lift out intermediate lever (2) and set down in an orderly fashion.

IMPORTANT: Keep holding torsion spring (1) with special tool 11 9 480.

Fig 10: Identifying Torsion Spring And Intermediate Lever

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Attach special tool 11 9490 to end of torsion spring.

Support end of torsion spring protected with special tool 11 9490 on inlet camshaft.

Fig 11: Identifying Special Tool On Torsion Spring

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IMPORTANT: Intermediate levers (2) are divided into individual tolerance classes.
Only intermediate levers of the same tolerance class may be fitted in a single cylinder head.
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.

Fig 12: Identifying Intermediate Levers

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

Lift out intermediate lever (2) and set down in an orderly fashion.

IMPORTANT: Keep holding torsion spring (1) with special tool 11 9 480.

Fig 13: Identifying Torsion Spring With Special Tool (11 9 480)

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Attach special tool 11 9490 to second end of torsion spring.

Support end of torsion spring protected with special tool 11 9 490 on inlet camshaft.

Fig 14: Identifying Special Tools

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Release screw (1).

Fig 15: Identifying Screw

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Remove torsion spring (1) and special tool 11 9 490.

Fig 16: Identifying Torsion Spring And Special Tool (11 9 490)

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Remove intermediate levers and torsion springs of cylinders 5 to 7 according to the same procedure and set down in an orderly fashion.

Unscrew nut (special tool 11 9 473).

Fig 17: Identifying Special Tool (11 9 473)

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IMPORTANT: Camshaft bearing caps of cylinders 1 to 4 and 5 to 8 must not be mixed up.

NOTE: Bearing caps are marked in graphic with R E2 to R E5.

Remove bearing caps R E2 to R E5 and place to one side in order.

Fig 18: Identifying Camshaft Bearing Caps Numbers

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Lift out inlet camshaft (1).

NOTE: Further tasks:
The section Removing and installing left eccentric shaft contains important installation instructions. See 11 37 006 REMOVING AND INSTALLING/REPLACING LEFT ECCENTRIC SHAFT (N62 FROM 9/03 AND N62TU) .

Fig 19: Identifying Inlet Camshaft

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If necessary, replace plain compression rings (1).

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

Plain compression rings (1) are engaged at joint.

Press compression ring (1) on one side into groove, pull up on other side and remove catch.

Carefully pull compression ring (1) apart and remove towards front.

Fig 20: Identifying Plain Compression Rings Groove

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NOTE: Inlet camshaft of cylinder bank 5 to 8 is marked with "EIN 58".

If necessary, replace sensor gear (1).

Release screw (2) and remove sensor gear (1).

Fig 21: Identifying Sensor Gear And Screw

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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 22: Identifying Camshaft Sensor Gear Groove

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

Insert screw (2) and tighten down.

Tightening torque. See ENGINE - TIGHTENING TORQUES -- ALPINA .

Fig 23: Identifying Sensor Gear And Screw

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Installing plain compression rings (1):

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

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

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

Fig 24: Identifying Compression Ring Groove

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

Fig 25: Identifying 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 26: Identifying Bearing Shell Groove

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

Fig 27: Identifying Dowel Sleeves

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NOTE: Bearing caps are marked in graphic with R E2 to R E5.

Fit bearing caps R E2 to R E5.

Fig 28: Identifying Camshaft Bearing Caps Numbers

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

Secure bearing bracket and bearing cap with nut (special tool 11 9 473).

Fig 29: Identifying Special Tool (11 9 473)

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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 11 9 472.

Fit special tool 11 9 472 as shown in graphic and align inlet camshaft.

Fig 30: Rotating Eccentric Shaft

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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 31: Identifying Special Tools

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

NOTE: Special tools 11 9 472 , 11 9 474 and 11 9 475 remain fitted until all torsion springs and intermediate levers have been installed.

Fig 32: Identifying Special Tools

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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 33: Identifying Torsion Spring And Special Tool (11 9 490)

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Insert screw (1) and tighten down.

Fig 34: Identifying Screw

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

Fig 35: Identifying Intermediate Levers

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

Remove special tool 11 9 490.

Fig 36: Identifying Special Tools

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

Install intermediate lever (2) from above.

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

Fig 37: Identifying Torsion Spring With Special Tool (11 9 480)

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

Remove special tool 11 9 490.

Fig 38: Identifying Special Tool On Torsion Spring

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

Install intermediate lever (2) from above.

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

Fig 39: Identifying Torsion Spring And Intermediate Lever

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Install eccentric shaft sensor (2).

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

Fig 40: Identifying Eccentric Shaft Sensor

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Remove special tool 11 9 474.

Fig 41: Identifying Special Tool (11 9 474)

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

Fig 42: Identifying Special Tools (11 9 472) And (11 9 475)

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Ends of compression rings (1) point upwards.

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

Fig 43: Identifying Ends Of Compression Rings Point

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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.

Align rockers (1) straight.

Fig 44: Identifying Rocker Arms