The cam cover has to be removed and a special locking tool locks the two cams at the end. There is also another tool to lock the crank which is at the front of the engine near the gearbox, there is a bolt that has to be removed first.
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Are you needing the twin independent variable cam timing info or is this a cam replacement initial cam timing setting? the variable valve timing itself is dependent upon the part design, and is usually controlled by oil flow (causing the timing to change hydraulically and seems transparent to the driver). However, when replacing the cam, the timing is more of a position issue using the marks on the engine and camshafts to make sure the shafts are in the proper position.
If this is for a replacement, use the marks on the block ensuring the current valve position is the proper in relation to piston position (otherwise your pistons will punch the valves and blow the head)
there are no marks on the cams line the crank up you should see marks on it and on the cams take a flat piece of steel like a flat file and put it on the end of the cam shafts the side near near the drivers side ounce you take a look youll see what i mean this should help you out
What motor and year? If it is the Ej 25 DOHC all the marks are on the cam sprockets except the crank is marked in the block almost straight up, Just a small notch. Good luck and hope this helps. Have a good day.