Removing and Installing/Replacing Left Exhaust Camshaft

11 31 036 Removing and installing/replacing left exhaust camshaft (N62/N62TU)

(cylinder bank 5 to 8)

Necessary preliminary tasks:
^ Remove servomotor for left eccentric shaft
^ Remove ignition coils on cylinder bank 5 to 8
^ Remove left cylinder head cover
^ Remove spark plugs on cylinder bank 5 to 8
^ Remove left intake and exhaust camshaft adjusters

Remove slide rail (1).

Rotate exhaust camshaft at hexagon head until exhaust cam on cylinder (6) is facing upwards.

Important!
Camshaft bearing caps of cylinders 1 to 4 and 5 to 8 must not be mixed up.

Note:
Bearing caps of exhaust camshaft are marked on cylinder bank 5 to 8 with R A1 to R A5 from intake side.

Release nuts and remove bearing cap R A1.

Note:
Retaining clips (1) for oil line are fitted on bearing caps 3 and 5.

Release nuts on bearing caps R A2 to R A5.

Remove bearing caps R A2 to R A5.

Remove exhaust camshaft (1).

Important!
Plain compression rings (1) can easily break.

Plain compression rings (1) are engaged at joint.

Press compression ring (1) on one side into groove, pull up on other side and remove catch.

Carefully pull compression ring (1) apart and remove towards front.

If necessary, replace sensor wheel (1).

Release screw (2) and remove sensor wheel (1).

Installation:
Installation of exhaust camshaft is described separately from removal.

Clean all bearings and cams of exhaust camshaft and lubricate with engine oil.

Note:
Camshaft has a groove and sensor wheel has a lug for fastening purposes.

Fit sensor wheel (1) and align to groove in camshaft.

Insert screw (2) and tighten down.

Tightening torque 11 31 14AZ.

Installing plain compression rings (1):

Important!
Plain compression rings (1) can easily break.

Carefully pull compression ring (1) apart and install from front.

Press compression ring (1) on one side into groove, install catch on other side.

Note:
Rocker arms (1) of exhaust camshaft are of same design as rocker arms of intake camshaft.

The classification 3 shown in the graphic has no effect on the function on the exhaust camshaft.

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.

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

Align rockers (1) straight.

Lubricate exhaust camshaft and bearing caps with engine oil.

Install exhaust camshaft (1).

Rotate exhaust camshaft (1) until exhaust cam on cylinder 6 is facing upwards.

Check dowel sleeves (2) for damage and correct installation position.

Ends of compression rings (1) point upwards.

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

Note:
Retaining clips (1) for oil line are fitted on bearing caps 3 and 5.

Insert nuts and tighten by hand without play.

Tighten down nuts on bearing caps R A2 to R A5 in 1/2 turn increments evenly from inside to outside.

Tightening torque 11 31 1AZ.

Important!
Camshaft bearing caps of cylinders 1 to 4 and 5 to 8 must not be mixed up.

Fit bearing cap R A1 in such a way that marking is legible from intake side.

Install nuts and tighten down.

Tightening torque 11 31 1AZ.

Note:
A gasket (2) is installed between cylinder head and slide rail (1).

Replace gasket (2) and pre-install on slide rail (1).

Install slide rail (1) with gasket, insert screw and tighten down.

Rotate exhaust camshaft against direction of rotation until cam on 5th cylinder points upwards at an angle as shown in graphic.

Install intake and exhaust camshaft adjusters on left side.

Install spark plugs on cylinder bank 5 to 8.

Install left cylinder head cover.

Install ignition coils on cylinder bank 5 to 8.

Assemble engine.