Checking the Timing

Checking the timing








Warning: Never twist the crankshaft the direction of movement! Proceed carefully and accurately when performing the test as otherwise the engine can be damaged!
Only turn the engine on the crankshaft and never on the camshaft as the timing chain can jump over!

Note:
^ The timing is always checked simultaneously on both cylinder banks. Once a cylinder bank has been checked, the crankshaft not be turned to check the other cylinder bank!
^ The cylinder bank is checked with the standard chain tensioner that is installed.

Checking the timing





1. Remove the camshaft housing cover on both cylinder banks.

Note: To remove the play from the timing chain for the check, the crankshaft must be positioned at least 45° in front of the TDC of cylinder 1 before turning!





2. Using socket insert wrench 9714, turn the crankshaft until cylinder 1 is located in the ignition TDC. Insert fixing pin 9595/1 into the revelant groove in the timing chain housing cover through the bore provided in the crankshaft gearwheel.





3. Ensure that the cams on cylinder 1 face upwards (ignition TDC).

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. Simultaneously fix both cylinder banks (1-4 and 5-8) in the rear grooves of the camshafts using camshaft ruler 9678. The timing is correct if the camshaft rulers on both cylinder banks fit into the rear camshaft grooves and fixing pin 9595/1 fits into the relevant groove of the timing case cover through the bore provided in the crankshaft gearwheel.





View shows position of cams on cylinder 1





View shows position of cams on cylinder 5





View shows TDC position of crankshaft

5. Set the timing if necessary.
6. Remove camshaft ruler 9678 and fixing pin 9595/1
7. Install the cylinder head cover on both cylinder banks.





Tightening torques