11 31 025 Removing And Installing/Replacing Inlet Camshaft (N12)

Special tools required: 

• 11 4 481 
• 11 9 551 

Necessary preliminary tasks: 

• Remove cylinder head cover.
• Remove adjusting unit for inlet camshaft.
• Remove intermediate lever.
• Remove exhaust camshaft.

Fig 1: Identifying Camshaft Stop

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Bearing cap (1) marked 5 is a thrust bearing.

Release screws of bearing caps (1 to 5).

Set all bearing caps down in special tool 11 4 481  in a tidy and orderly fashion.

Remove camshaft (6).

Installation: 

Clean all bearing points and lubricate with oil.

Check plain compression rings for damage.

Fig 2: Identifying Bearing Caps

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If necessary, replace plain compression rings (1).

The plain compression rings have catches at the joint.

Press plain compression rings (1) apart upwards and downwards and removed towards front.

Make sure plain compression rings (1) can move freely.

Fig 3: Identifying Plain Compression Rings

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Fig 4: Identifying (IN And EX) Camshaft Installation Position

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Insert camshaft (E) so that IN marking points upwards.

Position inlet camshaft (E) so that cams point upwards at an angle.

Attach special tool 11 9 551  to twin surface.

Make sure plain compression rings cable can move freely.

Fig 5: Identifying Inlet Camshaft Left In Upper Position

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All bearing caps are identified from 5 to 10.

Pay attention to pairing letters (1).

Fig 6: Identifying Pairing Letters

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Tighten bearing caps from inside outwards.

Tightening torque: See ENGINE - TIGHTENING TORQUES .

Fig 7: Identifying Bearing Caps

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Adjust valve timing.

Assemble engine.