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It seems the C3 is toleranced for interference fits.
As the bearing housing (front cover) would cause the bearing outer race to shrink.
Bearing Works :: Technical Data :: Internal Clearance
http://www.skf.com/group/products/be...nce/index.html
regards
Hi folks, said I would report back when problem solved.
Turned out to be a faulty tensioner, which is "notchy" - ie does not deliver a linear amount of torque to the belt, locks up at different stages, causing less torque and intermittant belt slippage.
Kicking myself for not cottoning-on sooner, as I noticed some slippage after replacing the old unit 2 years ago!
A genuine idler / pulley assembly plus genuine belt on way.