Lancia Motor Club

Model Technical and Interest => Aurelia => Topic started by: brian on 01 May, 2019, 03:50:56 PM

Title: B10 clutch
Post by: brian on 01 May, 2019, 03:50:56 PM
The b10 has a fairly weak clutch at best but I think it is slipping more than I remember. So before SPR I thought I would just check it over - expecting it to be full of oil from the front of the gearbox.
Once I had got it off and open I was surprised by a) how I had remembered quite well how to do it as it must have been 15-20yrs ago and b) how remarkably little oil was inside.
The plate does not look very worn. The faces are a little crazed and discoloured, presumably from the XS heat and there is quite a lot of black sticky dust but no free oil at all.
The springs are all intact and measure 52.4mm.

1. Are the springs about the right length (I have no w/shop manual to check)
2. Is not, are there any out there?
3. How can one check that the metal faces have not worn too much?
4. If above seem OK, do I just de-grease plate and reassemble?

Advice gratefully received as I am keen to have a hopefully stress-free outing in May/June to the Ardennes!

Aprilia back and going well but still no Augusta!

Title: Re: B10 clutch
Post by: simonandjuliet on 01 May, 2019, 05:11:00 PM
I think that I have some springs and I definitely have a new pressure plate that I can measure if you wish (or you could make me an offer for it....!)

Title: Re: B10 clutch
Post by: chriswgawne on 01 May, 2019, 05:13:56 PM
Whenever I have had an Aurelia clutch problem on a trip when a quick fix is needed by the side of the road, if my clutch springs seem a little suspect or if the plate is a little worn I am not averse to fitting 'penny washers' under the springs as a quick fix. Not very scientific but quite quick and easy to do as long as the springs still have some travel in them. .
I am not sure whether there is any data out there as to clutch inner and outer spring length when new.

Title: Re: B10 clutch
Post by: lancialulu on 01 May, 2019, 05:16:28 PM

No data in Paul Mayo manual for S1 Clutch!!

Just say 9 inner and 9 outer.

Re springs it is important to test the length under load. Fro example S2 length should be 38.5 under load (which is model dependant but is in the order of 31kg for an outer).

Best check if any are soft and also heat weakened. I am suspect Omicron may help with springs - Cavillitto has a set on his website but these look S2.


Title: Re: B10 clutch
Post by: brian on 01 May, 2019, 06:43:58 PM
Thanks for info.
I did put a steel ring under the Augusta spring to beef it up (this was before new ones were made) and it was working well but during my rebuild (broken big end bolt) I have used the remanufactured one.
B10 info seems generally in short supply!!

Title: Re: B10 clutch
Post by: Niels Jonassen on 01 May, 2019, 07:43:34 PM
Be aware that the plate may have become slightly concave, so that it only binds on the outer half. My B20 clutch was slipping badly. Grinding the plate flat cured the problem.