HELP PLEASE ! I just started my 993 up after a clutch / flywheel and a few oil seals. I did replace the chain tensioner gaskets but was careful not to let chains move. It makes a horrible clanking now when I start it up ? Anyone out there have any idea what I might Have done ? I went slow and by the book ? Sounds like it's coming from drivers side timing chain area. But not sure. Thank you for any help.