sorry, I overlooked that last question . For making good I assembled a little how to check the NX250 cam chain tensionerPetrus hat geschrieben: ↑Di Jul 18, 2017 3:49 pm One more question, that may be caused by my defective “english knowledge” when watching the manual:
After remove valve cover and remove the cam chain tensioner to test if it works ok (lifter operation) at the end I don’t have to left the rod locks in the retracted position, right? So, how many turns on anticlockwise will I do? The same that I did before on clockwise direction?
First make sure the the piston is at the upper dead position by aligning the T-mark, then remove the head cover download/file.php?id=9747&mode=view and the tensioner. At that occasion you can check the timing. The timing marks should be parallel.
Then check the tensioner - there is often breakage due to some previous owner. Then try to push the rod backwarts, it must not be possible. This is only a static test, if the cam chain is worn out its vibrations will turn the rod mechanism backwarts, the cam chain loosened and starts to rattle - in this case there is a certain fix but a new timing chain would be the better solution.
With a screw driver turning clockwise the rod is pushed back into the housing. After relasing the rod should spring out of the housing. Finally, the rod must be arrested by turning clockwise until there is resistance - then turn a bit more (not too much or you will brake the housing) until the rod is fixed in fully retracted position.
Install the tensioner and hit it with a screw driver, finally check the timing chain tension.