Camshaft: Adjustments
Adjusting the timing for the camshaftsTools
Preliminary work
Note: To remove the play from the timing chain for the setting process, the crankshaft must be positioned at least 45° in front of the TDC of cylinder 1 before turning!
1. Remove camshaft housing cover on both cylinder rows.
ATTENTION Damage to engine by turning crankshaft against the rotation direction of the engine (engine assembled)!
^ Never rotate crankshaft against the operating direction if the timing drive mechanism is mounted (timing chain jumps over).
^ Proceed carefully while working as otherwise the engine can be damaged.
^ Always turn the engine on the crankshaft and never on the camshaft as the timing chain may jump over.
^ After working on the camshaft wheels, the timing must be set.
^ Please observe the general warning notes and working regulations
Note:
^ The setting is always checked simultaneously on both cylinder rows. Once a cylinder row has been set, the crankshaft must not be turned to set the other cylinder row!
^ The fastening screws on the sprocket wheels do not need to be replaced after they have been undone.
^ The screws on the sprocket wheels are tightened by hand during assembly and are then loosened by one or two turns. This play is necessary so that the camshafts can still be turned.
^ The setting is carried out with the standard chain tensioner that is installed.
2. Use socket wrench insert 9714 to turn crankshaft until cylinder 1 is in ignition TDC. Insert fixing pins 9595/1 into the relevant groove in the timing chain housing cover through the bore provided in the crankshaft gearwheel -see figure-.
Note: If the cams on cylinder 1 are not positioned as shown, check whether the crankshaft needs to be turned through another turn (360°)!
3. Make sure that the cams of cylinders 1 and 5 are positioned as shown (ignition TDC cylinder 1) Cams of cylinder 1 View shows position of cams on cylinder 5.
Tools and materials
Special tools
Adjusting the timings for the camshafts
The crankshaft is positioned in the TDC and is fixed using fixing pins 9595/1 once the above preliminary check has been performed.
Note: The fastening screws on the sprocket wheels do not need to be replaced after they have been undone.
1. Undo all four fastening screws of the camshaft wheels (two camshaft adjusters) on both cylinder rows. For this purpose, hold the hexagon of the camshaft wheel on the respective camshaft with the ring wrench and release pan-head screw M12 1 by 2 revolutions --To illustrate the process more clearly, the figure does not show the timing case lid--.
Note: Cylinder rows 1 - 4 and 5 - 8 are adjusted at the same time without the camshaft being turned!
2. Turn the four camshafts on the hexagon with an open-ended wrench until the camshaft guide 9678 can be pushed into the grooves of both camshafts of a cylinder row.
Note: Cylinder rows 1 - 4 and 5 - 8 are adjusted at the same time without the camshaft being turned!
3. Then adjust camshafts of the other cylinder row. For this purpose, turn the hexagon with the open-ended wrench and fix it with camshaft guide 9678. Check whether the camshaft guide alternately fits into the grooves on both cylinder rows of the camshafts.
4. Tighten all camshaft wheels (two camshaft adjusters) again with pan-head screw M12. For this purpose, hold hexagon of the respective camshaft with ring wrench and tighten M12 pan-head screw.
5. Remove camshaft guide 9678 and fixing pins 9595/1.
Subsequent work
Reworking
1. Install camshaft housing cover on both cylinder rows.