Coil to Diaphgram Clutch - backplate limit

[moita]

Hi,

I am in the process of changing from coil spring clutch to a diaphragm on my 850. It has already normal crank tale so, I have pickup a diaphgram clutch assembly. I have mainly 3 questions while reading several information related.

1. Is it usually found that back plate is not compatible between system, which I think they are? What is not compatible is the pressure parts (coil or diaphgram) with flywheel?

2. Still related with first question, the back plate that was on the diaphragm clutch system I have is a 2A3509 which relates to coil spring. Is this ok to use with diaphgram ?

3. What would be the limit to re-faced this backplate 2A3509? Unfortunately after first face clean is still pitted. Would a thickness of 8 to 8.5mm be ok for a 850 ? Green diaphgram.

Thank you very much!

Nuno Moita

[mk1]

I did this MANY, MANY years ago. As Far as I remember, I followed the instructions in the Modified Mini book, & all went fine.



Re the skim, I wouldn't be skimming that much off myself, but if its your only choice & you take a similar amount off the backplate lugs, I can't see a problem.

[moita]

Hi Mark,

Thank you for your reply.

I have a flywheel already for diaphgram, so don't need to do that, fortunately. Crank is already a normal tale.

My concern is about backplate inter compatibility, as info found is not clear all time. I think they are compatible between versions. Just the flywheels don't.

About skim, I have said to remove a little more, until max 8.5mm as unfortunately was still pitted with a very first light skim. Lugs will have same skim to compensate.

Thank you!

[mk1]

As long as the pads & plate are skimmed a similar amount, I don't see a problem as long as it's not thrashed.

[OGW 1082]

I've also converted a coil spring clutch to diaphragm as Mark had done and all worked well.
I seem to recall the slave cylinder push rod is a different length from one to the other.
Could be wrong though, old man memory now.
Glen

[moita]

Thank you both I will have that in mind!