Jerry , if you study the crap videos it looks like the noise frequency is the fan hitting the bottom pulley , perhaps because it's loose??

The clack clack noise level has not changed between videos , just some valve lash noise added in the 2nd vid.

What do you think.

ps, it could be a broken piston , very hard to tell , but the noise does sound external , not internal to me.
Regards

Last edited by Dusty; 11/22/2012 10:29 PM.