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

Special tools required:

(cylinder bank 5 to 8)

Necessary preliminary tasks:

Remove SERVOMOTOR FOR LEFT ECCENTRIC SHAFT
Remove ignition coils on cylinder bank 5 to 8
Remove LEFT CYLINDER HEAD COVER
Remove spark plugs on cylinder bank 5 to 8
Remove LEFT INLET AND EXHAUST ADJUSTMENT UNITS

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: Locating Inlet Camshaft Position

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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 Camshaft Bearing Caps Of Cylinders

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

Fig 3: Locating 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.

Fig 4: Locating Rocker Arms On Inlet Side

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

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 Special Tools (11 9 470) And (11 9 473)

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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: Locating 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 For 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: Locating 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 And Intermediate Lever

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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 Tool (11 9 480) And (11 9 490)

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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

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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

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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 Bearing Caps Marks

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Lift out inlet camshaft (1).

Fig 19: Identifying Inlet Camshaft

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NOTE:

Further tasks:

The article REMOVING AND INSTALLING LEFT ECCENTRIC SHAFT contains important installation instructions.

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 Compression Ring

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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: Locating Sensor Gear

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

Insert screw (2) and tighten down.

Tightening torque: 11 31 14AZ . See CAMSHAFT for specs.

Fig 23: Aligning Sensor Gear With Camshaft Groove

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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: Pulling Compression Ring

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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

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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 Bearing Cap Marks

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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

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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: Fitting Special Tools

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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: Aligning Special Tool To Bearing Caps

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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

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Insert screw (1) and tighten down.

Fig 34: Identifying Torsion Spring 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: Locating 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 Tool (11 9 480) And (11 9 490)

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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 And Intermediate Lever

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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 For 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 Compression Rings

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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 On Inlet Side

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Remove special tool 11 9 473.

Remove bearing bracket (1) from special tool 11 9 470.

Fig 45: Identifying Special Tools (11 9 470) And (11 9 473)

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IMPORTANT:

Do not tilt bearing bracket (1).

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

Insert nuts and tighten by hand without play.

IMPORTANT:

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

Fig 46: Locating Bearing Bracket

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Tighten down nuts from inside to outside.

Tightening torque: 11 31 1AZ . See CAMSHAFT for specs.

IMPORTANT:

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

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

Install nuts and tighten down.

Tightening torque: 11 31 1AZ . See CAMSHAFT for specs.

Fig 47: Locating Camshaft Bearing Caps Of Cylinders

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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.

NOTE:

The marking (1) on the hexagon drive of the inlet camshaft faces upwards.

Fig 48: Locating Camshaft Bearing Caps Of Cylinders

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Install INLET AND EXHAUST ADJUSTMENT UNIT ON LEFT SIDE .

Install spark plugs on cylinder bank 5 to 8.

Install LEFT CYLINDER HEAD COVER .

Install ignition coils on cylinder bank 5 to 8.

Install SERVOMOTOR FOR LEFT ECCENTRIC SHAFT .

Assemble engine.