Guys, Apologies for the continuing million & one questions but I need to consider all my options before replacing the clutch. I am in the region of £1000 for a replacement and not sure of what you get. I am off to see a clutch manufacturer to see if they can re-surface the twin plates. What info will he need in order to do this. I picked up this info from the old archives:- Facing outer diameter: 215mm Facing inner diameter: 148mm Intermediate plate thickness: 9.0mm Thickness of clutch plate without load: 7.25mm Thickness of driven plates under load of 535 daN: 6.90mm Wear limits for each clutch plate: 0.8mm How does one measure the plates - I read 5mm using a micrometer basically across the two surfaces of each plate , but I cannot believe you can go down to 0.8mm as you would be hitting rivets against the flywheel ? What about material - just ask for their advice ? Now my big worry, has anyone replaced the springs (6 off) on the intermediate drive plate ? - I have 2 broken, Sorry for being such a nuisance John
For a twin-plate clutch, specs are as you have posted. "Thickness of clutch plate without load" >>> spec is 7.25mm "Wear limit for each clutch plate" >>> spec is 0.8 mm. Meaning the minimum thickness of the plate, measuring as you have done (without the plate under load), is 7.25mm minus 0.8mm, which is 6.45mm. If you are reading 5mm for this measurement, your plates are SHOT. They need to be replaced, or re-lined with material of the appropriate thickness to bring them back into specifications. There must be an AP clutch specialist who could answer your questions regarding material and springs. Like you, I'd hate to pay the big money for Ferrari replacement parts if they could be rebuilt.
Jeff, Many thanks - that makes sense. I appear to have lost 2mm wear in 6K miles. Sounds like some awful previous owners. Intermediate plate in 10mm which is fine. AP Racing won't do direct business with me so I may be facing the big expense. As I am into ownership for the long haul with this car it may be best just to bite the bullet. Cheers John
John: Have you contacted any commercial clutch specialists in your area? They can put new friction material onto your old disc, as long as you have the specifications. And they should also be able to replace the broken springs in your plate. You still may be able to save a significant amount of money here.
