11 31 036 Removing and installing/replacing left exhaust camshaft (N74)

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(cylinder bank 7 to 12)

Necessary preliminary tasks:

Fig 1: Identifying Camshaft Bearings 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 exhaust 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 exhaust camshaft has been removed.

Do "not" remove rocker arms (1) on exhaust 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.

Modify plain rectangular compression ring on new camshaft.

Fig 3: Identifying Plain Rectangular Compression Ring

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Ends of plain rectangular compression rings (1) point upwards.

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

NOTE: The exhaust camshaft (1) of cylinder bank 7 to 12 is marked with "A and 712".

Fig 4: Identifying Exhaust Camshaft Labelling

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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.

Align all rocker arms (1) straight.

Coat all bearing positions with engine oil.

Fig 5: Identifying Rocker Arm

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Install exhaust camshaft (1).

Insert exhaust camshaft (1) so that cams point to side at cylinder 5 as shown in picture.

Coat all bearing positions with engine oil.

Fig 6: Locating Exhaust Camshaft Cams

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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 can only be installed in one 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 Code

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E = Intake side

A = Exhaust side

1 = Designation from 1 to 7

Fig 8: Left Exhaust Camshaft Bearing Bolts Tightening/Loosening Sequence

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Coat all bearing positions with engine oil .

Insert all bolts .

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

Tightening torque: see 1AZ in 11 31 CAMSHAFT

Preload exhaust camshaft (1) with an open-end spanner (2) towards left.

Fig 9: Preloading Exhaust Camshaft With Open-End Spanner Towards Left

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Block exhaust camshaft with special tool 11 9 893.

Fig 10: Blocking Exhaust Camshaft Using Special Tool 11 9 893

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Install INTAKE ADJUSTMENT UNITS .

Adjust VALVE TIMING .

Assemble engine.