Hi there,

just wanting to pick your brains about clutch arms and the thrust plunger that goes with it.

I had my mini on the road about 2 years ago and replaced the arm and plunger, drove it around for 6 months and then pulled the engine out for a rebuild. I have gotten back into it recently and I've noticed that there is a lot of wear for only 6 months driving!

Is this normal? can you buy hardened ones? is there a way to check if one is harder than the other as i'd rather change the arm every so often than the plunger.

thanks,

Leighton

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1975 Leyland Mini: 1060cc - resto/ ex-hsc project.

Original ones were both hardened. Whether the current quality ones sold still are I'm not sure, but they need to be for durability.

[edit] If you cannot file the ball or the outside of the plunger (near the hole) they are hardened..

If you want to know `how hard', you need to take the parts to someone who has a Rockwell or similar hardness tester. eg a toolroom or heat treatment shop.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Is it possible to harden new arms?

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That's why it's good to be.............ME

I would send it back to the supplier if soft, and get my money back. Not fit for purpose..
You should not have to re-engineer NEW parts.

If the good ones are now unobtainium new, either find a good s/h one, or get one made to sample (out of heat treatable steel) on a CNC mill. Make a bunch get them hardened, and people will buy them.
This local manufacture has happened here already with various parts, eg Hi-Los.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Like me, get this;
http://www.med-engineering.co.uk/catalo ... clutch-arm