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poeee
PostPosted: Mon May 04, 2009 3:10 pm 
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Do they normally need a kit put through them? Cooper S type.

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drmini in aust
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PostPosted: Mon May 04, 2009 3:13 pm 
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Yep, unless you KNOW they have been overhauled recently. :wink:

Kits are cheap.

<rdit> replace the plastic seal washer in between the 2 halves if you split them apart.

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Last edited by drmini in aust on Mon May 04, 2009 3:16 pm, edited 1 time in total.

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Austin850
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PostPosted: Mon May 04, 2009 3:14 pm 
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You might as well. It's not too difficult to do and it's worth giving the pistons a bit of a look at, at the same time.
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poeee
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PostPosted: Mon May 04, 2009 3:25 pm 
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Oh I was under the impression you replace the pistons when you kit em?

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sgc
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PostPosted: Mon May 04, 2009 3:32 pm 
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poeee wrote:
Oh I was under the impression you replace the pistons when you kit em?


Only if they're so badly pitted that the seals .. don't.

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Mick
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PostPosted: Mon May 04, 2009 3:34 pm 
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Location: Under the bonnet son!
you get the hard chromed caliper pistons, and then you get the stainless steel caliper pistons. The hard chrome verions eventually succumb to rust underneath the chrome while the stainless steel ones should last the life of the car.

If they've been rebuilt in the last 20 years, there's a high chance they are stainless and they will be fine. I always pay that little bit extra...pommy chroming isn't that good these days, if it ever was in the first place.

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Austin850
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PostPosted: Mon May 04, 2009 3:43 pm 
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Mick wrote:
you get the hard chromed caliper pistons, and then you get the stainless steel caliper pistons. The hard chrome verions eventually succumb to rust underneath the chrome while the stainless steel ones should last the life of the car.

If they've been rebuilt in the last 20 years, there's a high chance they are stainless and they will be fine. I always pay that little bit extra...pommy chroming isn't that good these days, if it ever was in the first place.



Yep, when I did mine last year, one was chromed and it was RS. The other was stainless and was fine. Just luck really.
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drmini in aust
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PostPosted: Mon May 04, 2009 4:05 pm 
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Note the S bridge seal between the 2 halves is a separate part, 17H8764L/1 in Kc's book, and it's not in the seal kit...

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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. :mrgreen:
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Mick
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PostPosted: Mon May 04, 2009 4:06 pm 
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Do you have to take them apart to put new seals through?? I always seem to have a reason to take them apart, so haven't given it a go without. I suppose that might be why they're not in the kit (when they really should be).

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drmini in aust
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PostPosted: Mon May 04, 2009 4:10 pm 
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Mick wrote:
Do you have to take them apart to put new seals through?? I always seem to have a reason to take them apart, so haven't given it a go without. I suppose that might be why they're not in the kit (when they really should be).

It is technically possible to do them in one piece, but it's a bastard of a job and you can't get in there to clean the bores of any rust etc.
I spend a penny and change the bridge seals. :wink:

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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. :mrgreen:
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poeee
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PostPosted: Mon May 04, 2009 4:38 pm 
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I've got 4 to chose from. Geeze I'm be rolling in the good bits now!

Hopefully pistons are good enough in 2/4.

Do you just clean up the bores with sandpaper or do they need something more exotic?

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