Removing and Installing/Replacing Left Inlet Camshaft
11 31 032 Removing and installing/replacing left intake camshaft (N62 from 9/03 and N62TU)Special tools required:
(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 intake and exhaust camshaft adjusters on left side
Important!
The intake 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 intake 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 intake camshaft are marked on cylinder bank 5 to 8 with R E1 to R E5 from intake side.
Release nuts and remove bearing cap R E1.
Release 8 nuts of bearing bracket (1) from outside to inside.
Note:
Rocker arms are freely accessible after bearing bracket has been removed.
Do " not " remove rocker arm (1) on intake side.
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.
When replacing rocker arms (1) on intake side: install rocker arms of the same tolerance class in the same position.
Clamp special tool 11 9 470 as illustrated in a vice.
Important!
Do not tilt bearing bracket (1).
Carefully lift out bearing bracket (1).
Place bearing bracket (1) with intake camshaft and eccentric shaft as illustrated on special tool 11 9 470.
Secure bearing bracket (1) with a nut (special tool 11 9 473 ).
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.
Note:
This work step will only be necessary if after the intake camshaft has been removed the eccentric shaft is also to be removed.
If necessary, remove eccentric shaft sensor (2).
Note:
Removal of the intermediate levers and torsion springs is described on the 8th cylinder. The same procedure is applicable to cylinders 5 to 7.
Raise one end of torsion spring (1) with special tool 11 9 480.
Lift out intermediate lever (2) and set down in an orderly fashion.
Important!
Hold torsion spring (1) still with special tool 11 9 480.
Attach special tool 11 9 490 to end of torsion spring.
Support end of torsion spring protected with special tool 11 9 490 on intake camshaft.
Important!
Intermediate levers (2) are divided into individual tolerance classes.
Only intermediate levers of the same tolerance class may be fitted in a single cylinder head.
The tolerance classes are designated as illustrated with the numbers from 1 to 5.
Used intermediate levers (2) may only be reused in the same position.
Raise second end of torsion spring (1) with special tool 11 9 480.
Lift out intermediate lever (2) and set down in an orderly fashion.
Important!
Hold torsion spring (1) still with special tool 11 9 480.
Attach special tool 11 9 490 to second end of torsion spring.
Support end of torsion spring protected with special tool 11 9 490 on intake camshaft.
Release screw (1).
Remove torsion spring (1) and special tool 11 9 490.
Remove intermediate levers and torsion springs of cylinders 5 to 7 according to the same procedure and set down in an orderly fashion.
Unscrew nut (special tool 11 9 473 ).
Important!
Camshaft bearing caps of cylinders 1 to 4 and 5 to 8 must not be mixed up.
Note:
Bearing caps are marked in graphic with R E2 to R E5.
Remove bearing caps R E2 to R E5 and place to one side in order.
Lift out intake camshaft (1).
Note:
Further tasks:
The section Removing and installing left eccentric shaft contains important installation instructions.
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.
Note:
Intake camshaft of cylinder bank 5 to 8 is marked with "EIN 58".
If necessary, replace sensor wheel (1).
Release screw (2) and remove sensor wheel (1).
Installation:
Installation of intake camshaft is described separately from removal.
Clean all bearings and cams of intake 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.
Insert intake camshaft (1) so that cams point upwards at cylinder 5 as shown in graphic.
Make sure bearing shells (1) of eccentric shaft are engaged in bearing bracket.
Note:
Bearing shell (1) is guided in a groove in bearing cap.
Check dowel sleeves (1) for damage and correct installation position.
Note:
Bearing caps are marked in graphic with R E2 to R E5.
Fit bearing caps R E2 to R E5.
Note:
Initially tighten special tool 11 9 473 without play only.
Secure bearing bracket and bearing cap with nut (special tool 11 9 473 ).
Note:
The mounting of the bearing bracket described later can only be performed if the first bearing of the intake camshaft is aligned with special tool 11 9 472.
Fit special tool 11 9 472 as shown in graphic and align intake camshaft.
Fit centering sleeves (special tool 11 9 475 ) and align special tool 11 9 472 to bearing caps 2 and 3.
Insert special tool 11 9 474 and initially tighten without play.
Note:
Special tools 11 9 472, 11 9 474 and 11 9 475 remain fitted until all torsion springs and intermediate levers have been installed.
Note:
Installation of the intermediate levers and torsion springs is described on the 8th cylinder. The same procedure is applicable to cylinders 5 to 7.
Attach special tool 11 9 490 to ends of torsion spring.
Install torsion spring (1).
Insert screw (1) and tighten down.
Important!
Intermediate levers (2) are divided into individual tolerance classes.
Only intermediate levers of the same tolerance class may be fitted in a single engine.
The tolerance classes are designated as illustrated with the numbers from 1 to 5.
Used intermediate levers (2) may only be reused in the same position.
Lubricate all sliding surfaces on intermediate lever (2) with engine oil.
Raise torsion spring (1) with special tool 11 9 480.
Detach special tool 11 9 490.
Hold torsion spring (1) with special tool 11 9 480.
Install intermediate lever (2) from above.
Insert end of torsion spring (1) into guide on intermediate lever (2).
Raise second end of torsion spring with special tool 11 9 480.
Detach special tool 11 9 490.
Hold torsion spring (1) with special tool 11 9 480.
Install intermediate lever (2) from above.
Insert end of torsion spring (1) into guide on intermediate lever (2).
Install eccentric shaft sensor (2).
Insert screws and tighten down eccentric shaft sensor (2).
Remove special tool 11 9 474.
Remove special tool 11 9 472 and special tool 11 9 475.
Ends of compression rings (1) point upwards.
Make sure compression rings (1) are engaged at ends.
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.
Remove bearing bracket (1) from special tool 11 9 470.
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.
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 intake side.
Install nuts and tighten down.
Tightening torque 11 31 1AZ.
Rotate intake camshaft in direction of rotation until cam on 5th cylinder points upwards at an angle as shown in graphic.
Note:
The marking (1) on the hexagon drive of the intake camshaft faces upwards.
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.
Install servomotor for left eccentric shaft.
Assemble engine.
