11 31 038 Removing And Installing/Replacing Right Exhaust Camshaft (N62/N62TU)

(cylinder bank 1 to 4)

Necessary preliminary tasks:

Remove SERVOMOTOR FOR RIGHT ECCENTRIC SHAFT
Remove ignition coils on cylinder bank 1 to 4
Remove RIGHT CYLINDER HEAD COVER
Remove spark plugs on cylinder bank 1 to 4
Remove RIGHT INLET AND EXHAUST ADJUSTMENT UNITS

Remove slide rail (1).

Fig 1: Identifying Slide Rail

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Rotate exhaust camshaft at hexagon head against direction of rotation until exhaust cam on cylinder (2) faces upwards.

Fig 2: Identifying Exhaust Cam 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 exhaust camshaft are marked on cylinder bank 1 to 4 with L A1 to L A5 from inlet side.

Release nuts and remove bearing cap L A1.

Fig 3: Identifying Camshaft Bearing Caps

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NOTE:

Retaining clips (1) for oil line are fitted on bearing caps 3 and 5.

Release nuts on bearing caps L A2 to L A5.

Fig 4: Identifying Retaining Clips

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Remove bearing caps L A2 to L A5.

Fig 5: Identifying Bearing Caps

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Remove exhaust camshaft (1).

Fig 6: Identifying Exhaust 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 7: Identifying Compression Ring

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If necessary, replace sensor gear (1).

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

Fig 8: Identifying Sensor Gear And Screw

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Installation:

Installation of exhaust camshaft is described separately from removal.

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

NOTE:

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

Fig 9: Identifying Sensor Gear Lug

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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 10: 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 11: Identifying Compression Ring

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NOTE:

Rocker arms (1) of exhaust camshaft are of same design as rocker arms of inlet camshaft.

The classification 3 shown in the graphic has no effect on the function on the exhaust camshaft.

Fig 12: Identifying Rocker Arm

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IMPORTANT:

Rocker arms (1) slip slightly when exhaust camshaft is fitted.

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

Used rocker arms (1) may only be reused in the same position.

Align rockers (1) straight.

Fig 13: Identifying Rocker Arm Position

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Lubricate exhaust camshaft and bearing caps with engine oil.

Install exhaust camshaft (1).

Rotate exhaust camshaft (1) until exhaust cam on cylinder 2 is facing upwards.

Fig 14: Identifying Exhaust Camshaft

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Check dowel sleeves (2) for damage and correct installation position.

Ends of compression rings (1) point upwards.

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

Fig 15: Identifying Compression Rings

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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 exhaust camshaft are marked on cylinder bank 1 to 4 with L A1 to L A5 from inlet side.

Fit bearing caps L A2 to L A5.

Fig 16: Identifying Bearing Caps Mark

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NOTE:

Retaining clips (1) for oil line are fitted on bearing caps 3 and 5.

Insert nuts and tighten by hand without play.

Tighten down nuts on bearing caps L A2 to L A5 in 1/2 turn increments evenly from inside to outside.

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

Fig 17: Identifying Retaining Clips

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IMPORTANT:

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

Fit bearing cap L A1 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 18: Identifying Bearing Cap Mark

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NOTE:

A gasket (2) is installed between cylinder head and slide rail (1).

Replace gasket (2) and preinstall on slide rail (1).

Fig 19: Identifying Gasket And Slide Rail

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Install slide rail (1) with gasket, insert screw and tighten down.

Fig 20: Identifying Slide Rail With Gasket

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Rotate exhaust camshaft against direction of rotation until cam on 1st cylinder points upwards at an angle as shown in graphic.

Fig 21: Identifying Exhaust Camshaft Cam

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Install INLET AND EXHAUST ADJUSTMENT UNIT ON RIGHT SIDE .

Install spark plugs on cylinder bank 1 to 4.

Install RIGHT CYLINDER HEAD COVER .

Install ignition coils on cylinder bank 1 to 4.

Assemble engine.