I replaced my clutch thrust bearing and carrier and a few other components a couple of years ago and it made a huge difference.

But I have noticed I have been needing to adjust the clutch over this time as if something is wearing. Something is not right as I have the adjuster way out now and even have the longer slave pin and the clutch is still close to the floor and crunching into reverse.

I'm going to at least remove the arm to check the ball for wear/cracks.

A few questions....

I seem to remember a discussion about the new bearing carriers wearing quite quickly? Have others experienced this??

If I need to replace the arm are the current new ones OK or am I better to mig weld the original ?

If I need to replace the carrier will I be able to remove the bearing without damage? (It's not that old)

Cheers

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

You will probably find the flat washer that the bearing presses on is very worn.
I had this happen and the symptoms were very similar to yours.
Every thing else was OK, but the bearing also needed to be replaced because of the metal dust

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

Phil ,
I've had a new style arm in mine for about 6yrs now and it is still ok . I changed it because i had
too much wear on the ball on the original one , maybe someone could lend you one to see if that helps .

The ball on the end of the clutch arm is hardened, I doubt MIG welding will last- as TIG done by a CIGWELD rep didn't fix my broken one.
I've had an aftermarket (thick) one in my car for at least 10 years and it's still good.
It's more likely that the ball has worn a groove inside the aftermarket plunger...

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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.

yep



if you're very lucky - I destroyed one of my 3w5/8 bearings trying to get it off, bad idea


I wonder about sleeving the carrier with something harder, or self lubricating, or... ?

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did I tell you that I won a trophy?

Maybe buy a new carrier and get it case hardened before use.
Or bore & sleeve it as you said, I'd try a bearing sleeve (roller bearing inner ring). Hard as...

[edit] I can't buy a bearing sleeve with 11.0mm bore; they go 10mm then 12mm. By the time you muck about wire cutting the hardened hole in the old carrier, then making and heat treating a hardened sleeve, you could make a new carrier from EN24 and get it hardened.
Note Karcraft's catalog says theirs are made in EN24 material (aka SAE4340). How hard I am not sure, I will check one out.

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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.

was thinking about whether there would be value in sleeving it with something like teflon that'd make a soft yet durable lining

on another topic, I've often wondered about resleeving the wok like this ebay listing, would need to be careful to get it centred, but taking the slop out of the plunger would help prevent shudder

_________________
did I tell you that I won a trophy?

If you sleeve it with teflon it will just flow out of the way, there is around 1,100kg force on that ball (= orange dot diaphragm spring clamp load).

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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.

I have an original BMC carrier here which I will Rockwell hardness test this week, but it is glass hard when tested with a file.
Who has bought suspected `soft' ones, and where from...?

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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.

How many do you want

ah, so it is a worthwhile repair/fix then?? :D

oh, and just one

_________________
did I tell you that I won a trophy?

Well I removed the arm to inspect the end and it is still in tact but worn a little further than before (it's an old original one).

However looking down into the bearing carrier there is an obvious groove worn into the carrier hole.

The carrier is only about 18 months old.

I don't believe these parts are as hard as they are supposed to be.

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

I have an original carrier, I will borrow a Karcraft one on Monday and test the hardness on both. The Kc one is supposed to be EN24 = good stuff.

_________________
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.

I have been able to bide my time with this issue by replacing the clutch arm with a new one, this helped as the new ones have a slightly better angle. The carrier must be slowly wearing still as I keep having to adjust the clutch.

But it all finally went pear shaped today. I had to drive the car to Sydney today and got caught in the mother of all traffic jams. I noticed I was slowly finding it harder to select gears until it was impossible and had to pull into a carpark.

Thought I was looking at having to get a tow but decided to remove the circlip from the slave and this gave enough travel, with more adjustment, to get normal clutch and was able to drive home.

Time to sort out the carrier me thinks, must have a ridiculous amount of wear in it now.

Is there anything else that could be causing these symptoms?

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

the arm etc. wouldn't degrade that quickly, sounds more like something leaking

_________________
did I tell you that I won a trophy?