there is a ticking/tapping noise coming from my '94 7.5L, the motor is stock with 103,000 miles, it is, and has always been, in a '94 F-350, 2wd crew cab long bed. the noise is coming from the passenger side of the motor towards the top, near the cylinder head. i have been told that it is a collapsed lifter. but my guess is that it is a loose rocker arm. which is it? or is it something different? all help will be greatly appreciated, for i am a 17 year old high school student with little experience with motors. i have a little knowledge of modern combustion engines. is this problem able to be fixed without pulling the motor? thanks.