Removing and Installing/Replacing Exhaust Camshaft
11 31 028 - Removing and installing or replacing exhaust camshaft (N54)
Special tools required:
- 00 9 120 00 9 120 Torque Angle Measuring Dial
- 11 4 350 11 4 350 Torque Wrench
- 11 8 551
- 11 8 552
- 11 8 553
- 11 9 000 11 9 000 Device
Important!
Risk of damage!
It is absolutely essential to follow an exact procedure for removing and installing the exhaust camshaft.
The upper and lower bearing banks must be tensioned with a total of six special tools 11 8 553.
Necessary preliminary tasks:
- Remove cylinder head cover
- Remove exhaust adjusting unit for exhaust camshaft.
- Adjust valve timing
Release bearing cap screw connections from outside inwards.
Lift out lower and upper bearing banks (1) with camshaft.
Note:
Illustration shows N52.
Important!
Both camshafts have different markings.
Mixing up the two camshafts will result in engine damage.
A - Exhaust camshaft.
E - Inlet camshaft
Check plain compression rings (1) for damage and replace if necessary.
Plain compression rings (1) are engaged at joint.
Press plain compression rings (1) apart upwards and downwards and removed towards front.
Important!
Plain compression rings (1) can easily break.
Important!
Removal on engine:
Engine at cylinder no. 1 firing TDC position.
Removed cylinder head:
When using special tool 11 9 000, it will be necessary to remove the aluminium profile insert.
Installation Note:
Before installing exhaust camshaft, make sure roller cam follower is correctly seated on HVCA element and valve.
Installing camshaft bearing bank:
Pre-install special tool 11 8 551 on cylinder no. 2.
Observe markings E and A
E: - Inlet side
A: - Exhaust side
Insert special tool 11 8 552 in screw connection of cylinder head cover.
Press down roller cam follower (1) on cylinder no. 2 with spindle nut of special tool 11 8 551.
Lay lower bearing strip (1) on cylinder head.
Installation Note:
Lubricate all bearing points with engine oil.
Insert exhaust camshaft (1) in lower bearing bank.
Installation Note:
Lubricate all bearing positions and cams with engine oil.
Installation position (1) of exhaust camshaft (2) at cylinder no. 1.
Join exhaust camshaft to lower and upper bearing strips with torque wrench from inside outwards to 8 Nm.
Release all screws of bearing bank (1) from outside inwards by 90°.
Check position of exhaust camshaft (2) at cylinder no. 6.
Roller cam follower (1) is not actuated.
Installation Note:
Lower and upper bearing banks must be aligned to each other at ground surfaces (1 and 2).
Bring thrust piece and legs of special tool 11 8 553 into contact at milled surfaces.
Note:
Schematic depiction of special tool 11 8 553 at upper bearing bank (1) and lower bearing bank (2).
Important!
Tighten screw (3) on thrust piece to 2 Nm.
Position special tool 11 8 553 over screw connection of bearing banks.
Note:
Make sure that legs come into exact contact on ground surfaces, lower bearing bank (1) and upper bearing bank (2).
Initially tighten screw of special tool 11 8 553 to ground surfaces of lower bearing bank (2) and upper bearing bank (1).
Important!
Tighten screws on thrust piece to 2 Nm.
Important!
Set special tool 11 4 350 to 2 Nm.
Pretension all special tools 11 8 553 with special tool 11 4 350 only.
Mount special tools 11 8 553 with screw (1) to inside of cylinder head.
On cylinder no. 2 mount special tool 11 8 553 with screw (1) facing outwards.
Position special tools 11 4 350 so that screw connections (2) of bearing bank are easily accessible.
Tighten lower and upper bearing banks with special tool 00 9 120.
Position special tool 11 8 553 over screw connection of bearing banks.
Tightening torque 11 31 1AZ. Specifications
Important!
Remove special tool 11 8 553 only when camshaft screw connection is completed.
Assemble engine.