Removing and Installing / Replacing Rocker Arms on Left Inlet Side (N62 from 9/03)

11 33 516 - Removing and installing/replacing rocker arms on left inlet side (N62 from 9/03 and N62TU)





Special tools required:
- 11 9 470 11 9 470 Support
- 11 9 473 11 9 470 Support





(cylinder bank 5 to 8)

Removal of rocker arms is described separately from installation.

Necessary preliminary tasks:
- Remove servomotor for left eccentric shaft Removing and Installing / Replacing Servomotor for Left Eccentric Shaft (N62/N62TU)
- Remove ignition coils on cylinder bank 5 to 8
- Remove left cylinder head cover [1][2]Removing and Installing/Sealing Left Cylinder Head Cover
- Remove spark plugs on cylinder bank 5 to 8
- Remove left inlet and exhaust adjustment units Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Left Side (N62/N62TU)





Important!
The inlet camshaft must first be rotated so that when the bearing bracket is removed the intermediate levers do not slip out and damage the camshaft.





Rotate inlet camshaft against direction of rotation until lettering (1) on 8th cylinder points upwards in cylinder axis and cam is horizontal.





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

Note:
Bearing caps of inlet camshaft are marked on cylinder bank 5 to 8 with R E1 to R E5 from inlet side.

Release nuts and remove bearing cap R E1.





Release 8 nuts of bearing bracket (1) from outside to inside.





Clamp special tool 11 9 470 11 9 470 Support as illustrated in a vice.





Important!
Do not tilt bearing bracket (1).

Carefully lift out bearing bracket (1).





Place bearing bracket (1) with inlet camshaft and eccentric shaft as illustrated on special tool 11 9 470 11 9 470 Support.

Secure bearing bracket (1) with a nut (special tool 11 9 473 11 9 470 Support).





Important!
The lower section of the bearing bracket (1) is machined with the cylinder head and must not be mixed up.

Note:
Lower section of bearing bracket (1) remains on cylinder head.





Important!
Rocker arms (1) are divided into individual tolerance classes.

The tolerance classes are designated as illustrated with the numbers from 1 to 4.

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

Remove rocker arms (1) on inlet side and set aside in neat order.





Replacement only:

When replacing rocker arms (1) on inlet side:

Rocker arms have new tolerance classes and must be assigned to the old tolerance classes and fitted in the same position.

Old 1 - = new 2A
Old 2 - = new 2A
Old 3 - = new 2B
Old 4 - = new 2B





Installation:

Installation of rocker arms is described separately from removal.

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





Ends of compression rings (1) point upwards.

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





Install rocker arms (1) on inlet side.

Important!
Rocker arms (1) slip slightly when bearing bracket is fitted.

Make sure rocker arms (1) are secured as illustrated on hydraulic valve clearance compensating elements and on valves.

Align rockers (1) straight.





Remove special tool 11 9 473 11 9 470 Support.

Remove bearing bracket (1) from special tool 11 9 470 11 9 470 Support.





Important!
Do not tilt bearing bracket (1).

Lower bearing bracket (1) from above and carefully bring into contact with cylinder head.

Insert nuts and tighten by hand without play.

Important!
Make sure none of the intermediate levers or rocker arms have slipped out.

Tighten down nuts from inside to outside.

Tightening torque 11 31 1AZ 11 31 Camshaft.





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

Fit bearing cap R E1 in such a way that marking is legible from inlet side.

Install nuts and tighten down.

Tightening torque 11 31 1AZ 11 31 Camshaft.





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

Note:
The marking (1) on the hexagon drive of the inlet camshaft faces upwards.





Install inlet and exhaust adjustment unit on left side Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Left Side (N62/N62TU).

Install spark plugs on cylinder bank 5 to 8.

Install left cylinder head cover [1][2]Removing and Installing/Sealing Left Cylinder Head Cover.

Install ignition coils on cylinder bank 5 to 8.

Install servomotor for left eccentric shaft Removing and Installing / Replacing Servomotor for Left Eccentric Shaft (N62/N62TU).

Assemble engine.