Hi, My flywheel and pressure plate has been worn very unevenly (strangely both sides has more wear to the centre so the friction disc has become v-shaped) but I have had the flywheel re-surfaced and also purchased a complete new clutch so that is no longer an issue however I like to know what could have caused this to avoid the new clutch to be the same The rivets on the back of the flywheel has been slightly buffed on the tops probably from rubbing against the surface behind them, however that surface has no marks which is also a bit strange as it is in aluminum. I do not know how to post a picture but that would probably help to explain the problem. There is one thing I have noticed that may have something to do with it?! That is the OEM part # 142989 (spacer) appears to be home made in my car, is this supposed to line up with the axle coming out of the gearbox or what does this spacer actually do?! Here is a picture of the part in question (#5 in the picture), http://www.eurospares.co.uk/userImages/078/Large/078_021A.gif Is it anyone who has this spacer easily accessable and can take the measurements or post a photo of it?! Regards, Johan
I think my spacer looks home made, is this the original part? Image Unavailable, Please Login Image Unavailable, Please Login
Nope, that's the right factory looking part. Can you post pics of the damage to the old clutch please. It would be interesting to see and we can probably work something more out from there.
I think the problem may have been that gearbox oil leaked thru the triple seals and that the bearing that is fitted in the housing with the Prancing horse cap had a small play in it...?! However I changed all possible faulty parts... Here are a couple of pictures (in the picture at the bottom 0.4mm has been removed but to get it perfect again I had to remove almost 1mm), Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
More pictures, All that remains is to finish the axel for the flywheel balancing. A small worry is how the grease will affect the balance and how much it has to rev to spread evenly in the flywheel, any ideas on that?! Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Thanks! Now I just need to balance it... But the big question is how the grease inside the flywheel will affect the balance?!
The problem is that as you mentioned ernie in the other thread that it should be balanced without grease. I had an axle machined to do this and found out that it was worse that first expected from heat warping... So now I need to find that imperfection so there is no wobble before putting it in the balancing machine. I have some pictures if anyone like to se what happened but I will upload them later when I have the camera in hand. When I had it for balancing the guy who should do the balancing said that he did not understand the tolerances of imbalance. "Maximum imbalance whitout grease 250 g/mm" Can someone express the formula behind this and convert it to imbalance at the edge of the flywheel like when balancing a car wheel?
Hi and thanks for your reply, the question is if you can explain how to calculate the imbalance in the 348 flywheel? According to the manual it says that the maximum imbalance whitout grease is 250 g/mm. What does that actually mean and do you measure the imbalance? What does it make if converted into imbalance at the edge of the flywheel (similar to balancing a car wheel)?
Engine machine service in Los angeles can balance your FW. Most any machine shop can do it. FW balance is done like this: http://www.vibration.org/Presentation/VI%20Balance%20Grades.pdf G/mm is a standard unit of measure for imbalance like ft-lbs are for torque.
Thanks for the info! A vacation in LA sounds tempting but I think I will have to try and find someone in Sweden who can do it . I had it in a shop to balance it (that normally does only electrical engines) but the guy who should do the balancing had not heard of the way of measuring the imbalance as the machine he uses just indicated how much to remove and where to put the drill. How are these flywheels normally rigged up? Do you have any good pics of some flywheel balancing (If I could have mounted it to a crankshaft this had been no problem).
Hi again guys, Can someone please tell me what kind of gasket #50 is and how the bearing #49 should be fitted? I have replaced this bearing and pressfitted it to the same position as before (flush with the aluminum edge as in the picture). However there was no gasket with the old bearing which I discovered by accident after examining the exploded view of parts... Is this bearing supposed to be pressed all the way to the bottom? If someone has a picture of the actual seal #50 it would be of great help. Image Unavailable, Please Login Image Unavailable, Please Login
The bearing is a sealed bearing and there is a stop that will keep the bearing from going in too far (as I recall). The seal is an O-Ring and it mounts on the end of the clutch shaft. Image Unavailable, Please Login
Of course it is that o-ring...! (it looked like a different shape in the picture which had me confused and was called a O.R GASKET in the Ferrari parts list) from the picture it also looks like it is fitted behind and not inside the bearing... Thanks for clarifying!
