11 31 034 Removing and installing/replacing right inlet camshaft (N74)

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(cylinder bank 7 to 12)

IMPORTANT: With cylinder 1 in TDC firing position, the pistons are at the top in cylinders 1 and 6 Risk of damage!

For safety reasons, crank engine at central bolt back 30°.

Necessary preliminary tasks:

Fig 1: Identifying Camshaft Bearing Bolts Releasing Sequence

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Release bolts of camshaft bearings in sequence (1 to 14) in 1/2 turns .

Set down all bearing caps in a tidy and orderly fashion on special tool 11 4 480 .

Remove intake camshaft in upward direction .

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

NOTE: Rocker arms (1) are freely accessible after inlet camshaft has been removed.

Do "not" remove rocker arm (1) on intake side.

Fig 2: Identifying Rocker Arm

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

Press plain rectangular compression ring (1) on one side into groove, pull up on other side and remove latch mechanism.

Carefully pull plain rectangular compression ring (1) apart and remove towards front. Ends of plain rectangular compression rings (1) point upwards.

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

Fig 3: Identifying Plain Rectangular Compression Ring

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NOTE: Intake camshaft of cylinder bank 1 to 6 is marked with "E and 16".

Fig 4: Identifying Intake Camshaft Labelling

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IMPORTANT: Rocker arms (1) slip slightly when inlet camshaft is fitted.

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

Align all rocker arms (1) straight.

Installation note:

Coat all bearing positions with engine oil.

Insert inlet camshaft without strain.

Fig 5: Identifying Rocker Arm

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Installation note:

Ends of compression rings point upwards or downwards.

Make sure plain rectangular compression rings are engaged at ends.

Fig 6: Locating Plain Rectangular Compression Rings

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IMPORTANT: Do not mix up the bearing caps of cylinders 1 to 6 and 7 to 12.

All bearing caps are coded and must be installed in the same position.

All bearing caps are marked:

If both cylinder heads are removed at the same time, the respective bearing caps for each cylinder bank must be marked.

Fig 7: Identifying Bearing Cap Codes

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E = Intake side

A = Exhaust side

1 = Designation from 1 to 7

Check roller (1) of bucket tappet for ease of movement.

Fig 8: Identifying Bucket Tappet Roller

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Installation note:

Observe installation lugs of high-pressure carrier and bucket tappet.

Fig 9: Locating Lugs Of High-Pressure Carrier And Bucket Tappet

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Fig 10: Right Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence

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Fit all bearing covers .

Insert all bolts .

Tighten down bolts in sequence (14 to 1) in 1/2 turns .

Tightening torque: see 1AZ in 11 31 CAMSHAFT

Preload intake camshaft with a open-end spanner (2) towards right.

NOTE: Image of exhaust camshaft.

Fig 11: Preloading Intake Camshaft With Open-End Spanner Towards Right

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Block intake camshaft with special tool 11 9 893.

Fig 12: Blocking Intake Camshaft Using Special Tool 11 9 893

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Install INTAKE ADJUSTMENT UNITS .

Adjust VALVE TIMING .

Assemble engine.