11 37 012 Removing And Installing/Replacing Left Intermediate Levers (N62 From 9/03 And N62TU)

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Special tools required:

(cylinder bank 5 to 8)

Removal of intermediate levers is described separately from installation.

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:

The mounting of the bearing bracket described later can only be carried out if the inlet camshaft has not been axially displaced.

Special tools 11 9 472 and 11 9 475 prevent the inlet camshaft from rotating and moving while the intermediate levers are installed.

Fit special tool 11 9 472 and secure with special tool 11 9 475.

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

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

Fig 10: Identifying Special Tool (11 9 474)

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NOTE:

Removal of intermediate levers is described on 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.

Fig 11: Identifying Torsion Spring And Intermediate Lever

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IMPORTANT:

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

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

Fig 12: 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 13: 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 14: Identifying Torsion Spring And Intermediate Lever

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Attach special tool 11 9 490 to second end of torsion spring.

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

Fig 15: Identifying Special Tool (11 9 480) And (11 9 490)

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Installation:

Installation of intermediate levers is described separately from removal.

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

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.

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

Fig 16: Locating Intermediate Levers

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

Remove special tool 11 9 490.

Fig 17: 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 18: 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 19: 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 20: Identifying Torsion Spring And Intermediate Lever

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Remove special tool 11 9 474.

Fig 21: Identifying Special Tool (11 9 474)

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

Fig 22: 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 23: 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 24: 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 25: 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.

Tighten down nuts from inside to outside.

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

Fig 26: Locating Bearing Bracket

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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 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 27: 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 28: 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.