Removing and Installing/Replacing Exhaust Camshaft

11 31 028 Removing and installing/replacing exhaust camshaft (N18)

Special tools required:





Important!
It is absolutely essential to follow an exact procedure for dismantling and installing the exhaust camshaft.





Necessary preliminary work:
^ Remove cylinder head cover.
^ Check timing.
^ Remove chain tensioner.





Important!
Use special tool 32 2 100 to check the function of the adjusting unit by rotating the camshaft.

To release central bolts, always use special tool 11 7 440 of exhaust camshaft.

Position the special tool 11 7 440 at the mounting flats of the exhaust camshaft and fasten it with a screw (1).





Important!
Use special tool 11 7 440 to check the function of the adjusting unit by rotating the camshaft.

Position special tool 11 7 440 on intake and exhaust camshafts.

Secure special tool 11 7 440 on the cylinder head with screws (1).





Unfasten screws (2).

Remove tensioning rail (1).





Release screw (1).

Tightening torque: 11 11 3AZ.





Release central bolt (2).

Tightening torque: 11 36 2AZ.

Guide the VANOS unit in front of the timing chain toward the front.





Important!
Removed cylinder head:

When using special tool 11 9 000, it will be necessary to remove the aluminum strip.





Screw special tool 11 9 661 with special tools 11 9 662 into spark plug holes.





Release all screws on bearing caps (1 and 2).

Tightening torque: 11 12 8AZ.

Bearing cap (1) is a thrust bearing and has the number (0).

All bearing caps (2) are identified with numbers from (1 to 4).





Exhaust camshaft is identified with identification (EX).

Insert the exhaust camshaft so that the designation (EX) can be read from above.





Position exhaust camshaft (1) so that cam of exhaust camshaft (2) points outward at an angle.

Installation note:
Lubricate all bearing positions with engine oil.





Assemble engine.

Installation note:
Adjust valve timing.