Removing Camshafts

Removing camshafts

Tools and materials








Caution: Never twist the crankshaft the direction of movement!
Proceed carefully while working as otherwise the engine can be damaged!
Ensure everything is clean when working on valve drive!
Only turn the engine on the crankshaft and never on the camshaft as the timing chain can jump over!
Please observe general warning notes and working regulations!

Removing camshafts

Note:
^ While removing, note the installation position and allocation of the camshafts and bearing covers on a sheet of paper in such a way that they cannot be mixed up.
^ Protect camshafts, bearing covers and camshaft housing from dirt and put the components on a clean surface according to installation position.





1. Remove the camshaft housing cover on both cylinder banks.
2. Using socket insert wrench 9714, turn the crankshaft until cylinder 1 is located in the ignition TDC.
3. Ensure that the cams on the 1st cylinder face upwards (ignition TDC).





View shows position of cams on cylinder 1





View shows position of cams on cylinder 5

Note: If the cams on cylinder 1 are not positioned as shown, check whether the crankshaft needs to be turned through another turn (360°)!

4. Insert fixing pin 9595/1 into the relevant groove in the timing chain housing cover through the bore provided in the crankshaft gearwheel.





View shows TDC position of crankshaft

5. Remove chain tensioner.





6. Loosen timing chain and pull upper plastic guide away from both pins. If necessary, turn ring wrench back and forth a little so that the timing chain has more play between the wheels.





7. Unscrew fastening screw of camshaft adjuster and camshaft wheel. To do this, hold the SW 32 hexagon of the camshaft adjuster and camshaft wheel against the corresponding camshaft with a ring wrench. Unscrew pan-head screw M12 with the T60 socket wrench insert.

Caution: Do not let the diamond washer underneath the camshaft adjuster fall into the timing case.

Note:
^ There is a diamond washer between the camshaft and camshaft wheel or camshaft adjuster. This is to be replaced after the corresponding wheel has been removed. If the fastening screw of the wheel is only loosened in order to adjust the timing (1 or 2 revolutions), the diamond washer does not need to be replaced.
^ Secure timing chain with some wire and ensure that it does not fall into the timing case cover!





8. With both hands, carefully remove the camshaft adjuster and camshaft wheel out of the chain. Secure timing chain with some wire to ensure that it does not fall into the timing case cover.





9. Remove the diamond washer which is located underneath the camshaft adjuster and camshaft wheel.
10. Unscrew fastening screws M6 x 16 of the inlet camshaft oil feed housing and pull off oil feed housing towards you.

Note: When releasing the camshaft cover, all the fastening screws must be released to an even extent in stages of half a revolution contrary to the illustrated order so that the camshaft does not tense up!





11. Remove all the M6 x 35 fastening screws of the thrust bearing cover and bearing cover to an equal extent in stages of half a revolution contrary to the illustrated order. Put thrust bearing cover and bearing cover down on a clean surface according to installation position.
12. Remove camshafts and put down on a clean surface.