mehul7

Thanks for your reply. I adjusted the valve lash and some of them were a bit loose but not anymore. and the noise still persists. I was gonna unplug the injectors to check but i tried touching each injector with a screwdriver while the engine was running and couldn't feel any vibrations so i assumed they were fine. but i can try to pull each one and see what happens.

Hoping to get some ideas on what could be causing this ticking noise? 1977 Datsun 280z. Here is what I have tried so far - replaced timing chain, guides, sprocket and tensioner. Set timing to 10btdc, adjusted all valve lash to be in spec and tested compression on all the cylinders( front to back - 150,140,135,135,135,135). disconnected each spark plugs as the engine is running and the noise was still there so it probably has to be valve train related. Also when I touch the valve cover with a screwdriver the vibration seems to be strongest in the middle of the valve cover. Could a spring be hitting the camshaft bearing? GDDLnhm60J_KldsDAEz2D7tkz1FSbmdjAAAF.mp4 GJaNnBla4XuO2VYBAI8IT-CrJ5MMbmdjAAAF.mp4 GPPBjBkBAzve4twDAAZ6Ijg7PB0RbmdjAAAF.mp4