11 37 012 Removing And Installing/Replacing Left Intermediate Levers (N73)

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NOTE:

For Special Tool identification, see ENGINE- SPECIAL TOOLS .

Special Tools Required:

11 9 470
11 9 473
11 9 474
11 9 475
11 9 476
11 9 480
11 9 490

(Cylinders 7 to 12).

Necessary Preliminary Tasks:

Remove left cylinder head cover. Refer to 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (N73) .
Remove inlet and exhaust adjustment unit on left side. Refer to 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST VANOS ON LEFT SIDE (N73) .

IMPORTANT: Camshaft bearing caps of cylinders 1 to 6 and 7 to 12 must not be mixed up.

Set eccentric shaft at worm drive as shown in illustration to maximal stroke.

Pretension torsion spring (1) with a cable strap, feed out from roller (2) and carefully relieve tension.

Fig 1: Locating Torsion Spring (Left)

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

Fig 2: Aligning Eccentric Shaft (Left)

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IMPORTANT: Observe Removal Position Of Inlet Camshaft.

One or more intermediate levers may be pressed out downwards when the bearing bracket is removed.

IMPORTANT: Risk Of Damage. .

Set intermediate shaft lever (1) to minimum stroke .

Rotate inlet camshaft in direction of rotation until cam on 8th cylinder points vertically upwards as shown in illustration.

Fig 3: Adjusting Intermediate Shaft Lever (Left)

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Release nuts and remove bearing cap R E1.

IMPORTANT: Do not mix up camshaft bearing caps for cylinders 1 to 6 with bearing caps for cylinders 7 to 12.

Installation:

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

Fig 4: Identifying Bearing Cap R E1 (Left)

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Unscrew bolt (1).

Carefully unclip oil lines upwards in area (2).

Release nuts in area (3) from outside inwards.

Remove bearing bracket (4) towards top.

Illustrations show cylinders 1 to 6.

Fig 5: Locating Bearing Bracket (Left)

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

Fit bearing bracket in reverse sequence on special tool 11 9 470.

Fig 6: View Of Special Tool (11 9 470)

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

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

Fig 7: Locating Lower Section Of Bearing Bracket (Left)

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

Remove intermediate lever (2) upwards.

NOTE: One torsion spring holds two intermediate levers.

Installation:

Intermediate lever and rocker arm are run in together.

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

IMPORTANT: Hold torsion spring (1) with special tool, attach special tool 11 9 490.

Fig 8: Raising Torsion Spring With Lever (Left)

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

IMPORTANT: Risk Of Damage.

Fig 9: Supporting Torsion Spring End With Holding Sleeve (Left)

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Raise torsion spring on second side with special tool 11 9 480, remove intermediate lever upwards and secure with special tool 11 9 490.

IMPORTANT: Risk Of Damage.

Fig 10: Raising Second Torsion Spring With Lever (Left)

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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 numbers from 1 to 5. Used intermediate levers (2) may only be reused in the same position.

Fig 11: Locating Intermediate Lever Tolerance Class Marking (Left)