11 31 019 Replacing Camshaft Part 1
11 31 019 Replacing camshafts (S54)
Special tools required:
- 11 2 300
- 11 4 380
- 11 5 100
- 11 7 130
- 11 7 160
- 11 7 200
- 11 7 342
- 11 9 130
- 11 9 140
- 11 9 170
- 12 6 050
- 12 6 410
- 12 6 411
Read fault memory and make a documentary record.
Remove cylinder head cover. Service and Repair
Remove all spark plugs. Service and Repair
Remove fan clutch with fan impeller and fan cowl. Service and Repair
Removal: Removal of the VANOS adjustment unit and the camshafts is described separately from installation. Assembly sequence for removal and installation is different.
Fit special tool 11 5 100 to four screws on crankshaft hub.
Rotate crankshaft in direction of rotation as far as firing TDC position of 1st cylinder.
Secure vibration damper with special tool 11 2 300 in firing TDC position of 1st cylinder.
Important! When the engine is switched off, VANOS moves the camshafts to a position which is advantageous to engine starting.
The camshafts and the VANOS adjustment unit must be placed in the installation position before the VANOS adjustment unit is removed.
Detach bracket of oil line from timing case cover.
Remove oil line from VANOS adjustment unit.
Fit special tool 11 7 130 to VANOS adjustment unit.
Connect compressed air (2 to 8 bar).
Disconnect plug connection on solenoid valve.
Connect special tool 12 6 050 in conjunction with special tool 12 6 411 (from special tool kit 12 6 410) to solenoid valves. Connect special tool 12 6 411 to correct terminals on car battery.
Alternately press toggle switch buttons 1 and 2 several times on special tool 12 6 050.
Press and hold down toggle switch button 1 on special tool 12 6 050.
At same time, rotate inlet camshaft at hexagon drive against direction of rotation as far as it will go.
Note: Spline teeth in VANOS gear are engaged; and inlet camshaft cannot be rotated further.
Alternately press toggle switch buttons 3 and 4 several times on special tool 12 6 050.
Press and hold down toggle switch button 3 on special tool 12 6 050.
At same time, rotate exhaust camshaft at hexagon drive against direction of rotation as far as it will go.
Note: Spline teeth in VANOS gear are engaged; and exhaust camshaft cannot be rotated further.
Disconnect compressed air from special tool 11 7 130.
Remove special tool 11 7 130.
Unscrew screws (1).
Remove sliding rail (2).
Unscrew screws (3).
Remove holder (4).
Remove special tool 11 2 300. Rotate crankshaft in direction of rotation a further revolution up to overlap TDC position.
Note: TDC allocation above marking on vibration damper is sufficient.
Slacken six accessible bolts two turns.
Crank engine at central bolt in direction of rotation until 1st cylinder is at TDC firing position. Secure vibration damper in position with special tool 11 2 300.
Slacken remaining six bolts two turns.
Release screws on VANOS adjustment unit.
Important! Do not damage VANOS adjustment unit.
Carefully detach VANOS adjustment unit.
Inlet side:
Note: The spline hub (1) accommodates a plate spring and a supporting ring.
Take care: the supporting ring can easily fall out when removed.
Remove slackened screws on inlet side. Remove spline hub (1) with plate spring and supporting ring.
Exhaust side:
Note: The spline hub (1) accommodates a plate spring and a supporting ring.
Take care: the supporting ring can easily fall out when removed.
Remove slackened screws on exhaust side. Remove spline hub (1) with plate spring and supporting ring.
Remove chain tensioning piston. Service and Repair
Detach sprocket wheel (1 and 2) from centering sleeve.
Hold timing chain under tension.
Feed out sprocket wheel (1 and 2).
Secure timing chain against slipping down.
Remove special tool 11 2 300.
Important! No piston must be in the TDC position when the camshafts are removed.
Lift timing chain and hold under tension.
Crank engine at central bolt against direction of rotation to 30° before TDC position.
Note: This work step is only necessary if the camshafts are to be replaced at a later stage.
Grip camshafts at hexagon head.
Release bolts on centering sleeves (1).
Remove centering sleeves (1) on exhaust and inlet sides with thrust washers (2).
Note: This work step is only necessary if the camshafts are to be replaced at a later stage.
Withdraw toothed sleeves (3) from exhaust and inlet camshafts.
Remove profile seal (1).
Note: Inlet and exhaust camshafts have a joint thrust bearing flange at 1st bearing seat. Thrust bearing flange is secured with adapter sleeves.
Release nuts and remove thrust bearing flange (1).
Removing inlet camshaft:
Important! Note direction and angle of rotation.
Rotate inlet camshaft at hexagon inwards until cam tips on 1st cylinder are horizontal.
Inlet side:
Important! Incorrect removal/installation without a special tool exposes the camshaft to the risk of preliminary damage or breakage.
Fit special tool 11 4 380 on inlet camshaft and screw into spark plug threads of cylinders 2 and 5.
Pretension inlet camshaft by rotating eccentric shaft. Release all nuts of bearing caps on inlet camshaft.
Inlet side:
Note: Bearing caps are secured with adapter sleeves.
Bearing caps are marked E2 to E7.
Feed out bearing caps E2 to E7 and set down in order.
Inlet side:
Important! Inlet camshaft must not tilt when tension is relieved on special tool 11 4 380.
Relieve tension on special tool 11 4 380 and remove.
Lift out inlet camshaft.
Removing exhaust camshaft:
Important! Note direction and angle of rotation.
Rotate exhaust camshaft at hexagon inwards until cam tips on 1st cylinder are horizontal.
Exhaust side:
Important! Incorrect removal/installation without a special tool exposes the camshaft to the risk of preliminary damage or breakage.
Fit special tool 11 4 380 on exhaust camshaft and screw into spark plug threads of cylinders 2 and 5.
Pretension exhaust camshaft by rotating eccentric shaft. Release all nuts of bearing caps on exhaust camshaft.
Exhaust side:
Note: Bearing caps are secured with adapter sleeves.
Bearing caps are marked A2 to A7.
Feed out bearing caps A2 to A7 and set down in order.
Exhaust side:
Important! Exhaust camshaft must not tilt when tension is relieved on special tool 11 4 380.
Relieve tension on special tool 11 4 380 and remove.
Lift out exhaust camshaft.
If necessary, removing signal disk of exhaust and inlet camshafts:
Important! Do not damage camshafts. Use protective vice jaws.
Grip camshaft at hexagon in a vise and release banjo bolt (1).
Installation: Installation of camshafts and the VANOS adjustment unit is described separately from removal. Assembly sequence for removal and installation is different.