I've started to get a rapid rattling/buzz coming from the insider the clutch cover on start-up. It goes away after about 10 seconds. I took off the clutch cover expecting a loose tab washer on the clutch - but that's fine. I notice that the oil pump driven gear can be rattled a bit, though. There is some play where the teeth mesh with the smaller gear (drive gear?) , which could be the cause of the rattle. Does anyone know whether the gears are supposed to mesh so snugly that they don't rattle? Perhaps I just need to get a new driven gear and the problem will go away? Also, the driven gear is not held on by a circlip or anything - which seems odd. It looks like it's just supposed to sit on the shaft and stay there. Is that right? The manual just says "remove". Thanks for any advice.