AO Gold Member
Join Date: May 2008
Location: United Kingdom
County: Perth and Kinross
Yep, to change the camshaft oil seals, you need to take the cambelt off, which means replacing the belt. Probably best to have it done, especially if oil is getting onto the belt itself.
The noise problem could well be gearbox-related, but it could also be the clutch/release bearing. Or lack of oil for that matter.
Used ones are readily available, and generally quite robust. I've got a spare one at the minute if you don't have any luck locally. My courier charges about £30 so move a gearbox.