OK I have The Biggest Answer or Question for YOU. WAS The Gear Heated Before Installing It on the Cam.?? IF Not Then That was and IS you Problem. If You had a New Alum Gear Installed on the Cam and It was Not HEATED The Gear Walked Off The End. AND NOW Your cam is walking Front To back. This is why You hear what you do on the cam side of the block and More so Under the cover. So this may Or may not be your Problem Depending on what Your answer is. But if Your answer Is Yes a new gear and Not Heated.Then I'd pull the timing cover and Look at the gear.
What happens when The Gear Is not Heated before installing It will Shave Out the Inside of the Gear. and Then Becomes a Lose Fit ( No Longger a Tight Press Fit like it should be)
The Best way to fix this is issue is to have a New Gear installed AFTER HEATING IT. 2) is to press the gear back to where it should be and Then drill where the two meet Tap for a pipe plug (1/4in) and reinstall the cam. THIS IS NOT THE BEST WAY.!! INSTALLING A NEW GEAR IS.!!!!!!
Hope this helps }[oooooo]
God doesn't like ugly.
