Clutch

Thanks gents.
Very helpful as always.

whitehillbilly

The best way to oil the spogot bush is to place the bush on your thumb & fill it with oil then squese the open ende between b your thumb & finger untill you can see the oil start to swet out of the sides of the bush.

Quote:

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Originally Posted by mick88

Bronze that is full of little air pockets, a bit like honeycombe.
It will be dry when you get it, so it needs the oil for lubrication

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Sintered bronze bushes are made from compressed and heated powder, a bond occurs where the powder particles touch. They are normally pre-lubed but a bit extra won't be a problem.

I pressed a couple into some timber (part of a rocking horse) and all the lubricant leeched out into the timber ! The next one I made I varnished the inside of the hole before pressing them in.

Sintered Bronze Bushes, Sintered Metal Bearings, Manufacturer Of Sintered Bronze Bushes, Mumbai, India

Other parts can be made by sintering powders, I remember years ago seeing diesel rocker arms being made from powder.

[ame]https://www.youtube.com/watch?v=N4-kfSD6XJI[/ame]


How about gears made from powder

[ame]https://www.youtube.com/watch?v=pnR10rTk4BA[/ame]




Colin

My lawnmower has, I believe, sintered iron gears in the gearbox. These could be made accurately to size and shape by sintering, where if cast would need machining. After or during sintering the gears were strengthened by heating (in a non-oxidising atmosphere) to above the melting point of copper with a copper disc sitting on top of the gear. This melted and was absorbed by the sintered iron.

These sintered gears are supposed to be about as strong as cast iron, and much stronger and better wearing than diecast alloy, which would have been the alternative.

John

If you don't oil it before fitting it will dry out & stare squealing latter on & the box will have to come out again. I was a motor trade it is common practice to impregnate them with oil.

Hi,
What is the purpose of the little plastic U clip the connects the clutch arm to the thrust bearing.
The centre of the clutch arm pivots on a ball in a plastic bush. Under where it sits, is a brass washer, brass stop ????
Also a spring clip held with a 7/16 bolt.
When I pulled the arm out an inch washer was still attached to the centre pivot ball.
Does this washer fit on top of the spring clip, or between the plastic bush, under the spring clip.
Hope above makes sense ????

whitehillbilly

the plastic clip is an assembly aid and helps keep the arm on the throwout when the clutch is released

the brass washer provides the backing to the plastic bush that the pivot ball sits in. In the event of the plastic bush failing it provides a softer metal so the ball doesnt get chewed up and sticky.

the clip holds the fork over the ball, when removing the arm you remove the small bolt first then the clip then pull the arm off the ball.

The washer sits between the fork and the clip, adjustment of the arm on the ball is achieved by fitting a different thickness brass shim for the large adjustment and then finely sanding the back of the plastic cup.

Thanks Dave.
Could someone please tell me the difference between a S11a pressure plate and a S3 one.
The clutch plate on the new one is 9mm smaller in length at the spline centre, the distance being made up, as a triangular thrust plate is 9mm thick, which the thrust bearing pushes onto, not directly on the springs like the old one
I have a kit from Repco, but it looks like S11a from online kits.
I really also need to check what my 2 1\4 petrol motor and gearbox are S3 ones.
Will take some pics and post one numbers.
Thanks.

Whitehillbilly

some old and new differences

Thrust Bearing.
Has the dip in the thrust bearing, where the arm sits, on the old one machined, or made by the arm wearing the dip, as there is none on the new one ????
Would a good with no wear, plastic pivot bush be better than replacing it with an aftermarket one, also the original plastic U clip over a AM replacement.
Thanks.

whitehillbilly