Hi, so we checked the clutch on a 748r that has 12k miles on it, the clutch was changed at 7k and as we expected the plates were toast and the basket is grooved. So, replacing the basket and plates is on the cards. We noticed the below though, doesn't look right that the spring bases in the pressure plate look to have worn through, pretty sure it's for the bin also but have others seen this? Should there be washers at the base of the springs to limit the wear?
Agreed yeah, I guess 12k on a standard pressure plate, should they wear out? I guess being a slipper clutch maybe the plate gets worked harder on back torque, I'm just guessing
No idea mate. Don't have a slipper nor have I ever seen one. I changed my clutch pack the other day and fitted new Oberon springs and collets. I cleaned up the pressure plate with a bit of solvent and painted it black. Didn't seam to be any wear there like on your photos... Looks like it could be the original and just passed 15,000 miles.
Phill, what does the pack side of the pressure plate look like? It looks like a flat driven plate was missing, the slipper stack normally starts with a friction plate at the engine end (unlike a normal one which usually starts with a driven one or two) and finishes with 1 or two steel driven plates, 2 is probably better for road use. The spring caps are on the top not at the bottom (no washers under the springs)and the springs do not turn in normal use so there should be no wear from them on the pressure plate sockets. Stack height is important to get the right operating balance.
There was two metal plates under the pressure plate, one was seriously thin!! And the pressure plate has corroded where it's against those, bottom of the pack (ie in the engine) is a steel plate screwed in and then friction plate. All the friction plates have almost worn away.
The pressure plates all have 'holes' in the bottom of the spring pocket (at least on the outer edge) even when new, it's how they are machined. That said, what does it look like on the back?
Yep I agree with Dukedesmo, the pressure plates have two slots in each spring pocket. If you can't see them use some brake cleaner and a pin, they will be full of clutch dust.
Yeah! We replaced the clutch on it at the weekend, we put in the alloy one out of the 749r which is also 8 friction plates over the 5 in the stock 748r clutch, didn't realise there was so much variation
Phill, you have 3 choices, alloy plates and organic friction material (original 748), alloy plates with sintered material (1098R) and steel plates with sintered material (DP). The alloy friction plates are thicker than the steel friction plates which is why there are more steel sintered friction plates. The orignal 748R clutch basket was steel and the plates were alloy. The Ducati Performance after market clutch introduced the sintered steel racing plates. The alloy light weight clutches have a limited life but are cheaper than the steel. Pack height regardless of material is 36.5mm max. In the steel pack you often find 1 or 2 x 1.5mm dished drive plates which is supposed to smooth the pick up. Andy
