A Motobins Clutch Cockup?

[Lucky_Lou]

At my brothers this morning hoping to fit his new clutch we found the plates were very different and the new one is 1.5 mm thinner than the old one, surely this cannot be right.
Lou

[Bob_Roller]

Looks like a foul-up on their part .

Is it a 'pattern' part ?

Just from the look of the material above the rivet heads, the old clutch plate still appears to have a lot of wear left on it .

[Mike V]

Lou,

Interesting.  If my memory is correct the factory manual states minimum thickness of the clutch friction plate is 4.50mm. Does the new plate have rivets or is it an epoxy bond?

[Lucky_Lou]

Lou,

Interesting.  If my memory is correct the factory manual states minimum thickness of the clutch friction plate is 4.50mm. Does the new plate have rivets or is it an epoxy bond?

Its an Epoxy bond the old plate looks to have plenty of life in it but its slipping alot, when you assemble the friction plate theres still a gap were as the old one is gripped?
Im convinced its not right we will have to talk to Motobins about it they also cocked up his Exhaust nuts 2 different sizes??   [smiley=thud.gif]
Lou

[Bob_Roller]

Put a straight edge across the pressure ring and pressure plate to check for flatness, I guess it's common to have the plates get warped/wavy contact surfaces .

There is also a test for checking the diaphragm spring for being in specifications .

Measure the height of the spring at the contact points  on the clutch .

[Jon_P]

the fly wheel should always be resurfaced on a new clutch install and that goes for just about anything. the old plate is suffering from what called rust jacking there is rust build up between the fiction and the mounting plate and the rust is pushing the friction out. you wont get that with the bonded friction.

now i havent changed out a bmw clutch but there has to be some sort of adjustment to take up that slack. now that i think of it i have never done that on mine? i have to go check the big factory book and see what it says.

[nhmaf]

Definitely not a BMW brand part - possibly a knock-off (and not a good one either)?

I use a glass plate to check the pressure ring/clutch carrier parts and spring fingers for flatness.