Camshafts

Camshafts

Special tools, testers and auxiliary items required

• Puller (T40001)

• Retainer (3036)

Removing

• Sealing surfaces on guide frame at bottom and on cylinder head at top must not be worked.

• Camshaft bearings are integrated in cylinder head or in guide frame. Before removing guide frame, tension on toothed belt must be released.

• If guide frame was loosened, camshaft sealing ring and sealing cap must be replaced.

- Remove cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair

- Remove camshaft adjuster. Refer to => [ Camshaft Adjuster ] Camshaft Adjuster

- Remove toothed belt. Refer to => [ Toothed Belt ] Service and Repair

- Loosen camshaft gear with Retainer (3036).





- Pull off camshaft gear using puller (T40001), claw (T40001/6) and claw (T40001/7).





- Remove toothed belt guard at rear of cylinder head.

- Loosen bolts of guide frame evenly from outside toward inside and remove guide frame.

- Carefully remove camshaft upward and place on a clean surface.

- Remove old sealant from guide frame groove and from sealing surfaces.





- Prevent dirt and adhesive residue from entering cylinder head.

Installing

• Sealing surfaces must be completely free of oil and grease.

• The pistons must not be positioned at TDC.

• Make sure that all roller cam followers make contact correctly on valve stem ends.

- Oil journal surfaces of camshafts.

- Carefully insert camshafts into camshaft bearings of cylinder head. The cam lobes - A - of cylinder 4 must face toward one another.





- Apply an even, light sealant bead into clean groove of guide frame.





Sealant

• Sealant must not be applied too thickly.

• Attaching and bolting the guide frame should be performed without interruption because the sealant begins to harden immediately as soon as it contacts the sealing surfaces.

• Note the expiration date of the sealing compound.

- Set guide frame in place so that it can get by EGR Vacuum Regulator Solenoid Valve (N18) - arrow -.





- Replace guide frame bolts.

- Gently tighten bolts from inside working toward outside in several stages.

- Finally, tighten bolts in sequence shown.





- Drive in sealing cap with thrust piece (3334) approx. 1 to 2 mm deep.

- Install camshaft seal. Refer to => [ Exhaust Camshaft Sealing Ring ] Exhaust Camshaft Sealing Ring

- Install rear toothed belt cover.

- Insert fitting key into camshaft.

- Install camshaft gear. To tighten bolt, hold camshaft gear in place using Retainer (3036).





• When turning camshaft, pistons may not be at TDC for any cylinder. Valves/pistons may be damaged.

• Be sure fitting keys are properly seated.

- Install toothed belt. Refer to => [ Toothed Belt ] Service and Repair

- Install camshaft adjuster. Refer to => [ Camshaft Adjuster ] Camshaft Adjuster

- Install cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair

- Install lock carrier with attachments. Refer to =>
Radiator Support Radiator Support

- Place torque support stop onto rubber buffer for torque support under its own weight and tighten nuts - arrows -.





- Install front bumper cover.

- Check headlight adjustment.

The rest of assembly is basically a reverse of disassembling sequence.

Tightening Specifications

Cylinder head, camshafts. Refer to => [ Cylinder Head, Camshafts Assembly Overview ] Cylinder Head, Camshafts Assembly Overview