Hi,
yesterday, for the first time I removed the timing gear cover, because I had a knocking when the engine is hot.
Now I have seen, I can move the timing gear back and forth about 8 mm(0.3 inch).
Question: is this OK ?
Thats what the damper/spring plunger is for. New parts are available or you can shim the spring if its too weak. The main reason for the knock is too much clearance between the gear teeth. That clearance should be .004-.006". .010" will cause a knock.