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Thread: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PART 2

  1. #41
    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Bit of a thread revival here.

    As I never ended up with a pair of these and I still fancy some I was looking into them again.

    I've been looking into the diameter of the balljoint end needed to give enough material to have them machined out for the 35mm rose joints.

    I much prefer the rally design drop forged ones as I just think they look a little neater than the welded ones.


    Quote Originally Posted by GavinR View Post
    The chap who made them is Jeff Skitt who has a machine shop in Aberporth, West Wales
    He sourced the TCA's himself, but I remember there was a minimum O/D of the TCA to give sufficient wall thickness - I think it was 42mm and some aftermarket TCA's were too small. Rally Design ones for an Escort are big enough to be converted. Thanks Gavin

    Quote Originally Posted by GavinR View Post
    Hi - I measured it today and it's 41mm, so 3mm wall thickness around the bearing

    I have been intouch with Rally Design about the external diameter of the casting on them and they've said they are 39.2mm, so adding a 35mm rose joint in them would only leave 2.1mm of the casting around it.

    Is that enough material left on them or is it cutting it to fine really?
    Last edited by rallyrob; 30-07-2020 at 15:55.

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    Spanner Monkey Mkdu's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    It seems small.
    I can check on mine, has they are out of the car to replace the ball bearing.
    Will do that tomorrow.
    I should by 3 pairs, they are great, and this not so to difficult to replace the bearing.

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  4. #43
    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by Mkdu View Post
    It seems small.
    I can check on mine, has they are out of the car to replace the ball bearing.
    Will do that tomorrow.
    I should by 3 pairs, they are great, and this not so to difficult to replace the bearing.

    Did you supply your freddy with your own TCA's to be converted then or did he supply them for you? Are they the Rally Design drop forged type or are they the welded ones?

  5. #44
    Pit Crew Decade Plus User GavinR's Avatar
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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by rallyrob View Post
    Did you supply your freddy with your own TCA's to be converted then or did he supply them for you? Are they the Rally Design drop forged type or are they the welded ones?
    Hi Rob,

    A few years ago I got a local engineering company to make me some 10 spare pins in case I ever needed them and when lock down started a few months ago, I thought I would see if I could convert some TCA's myself - I have a lathe but have never done that much with it

    I had 3 pairs of Rally Design drop forged arms with worn ball joints (which is why I bought some of the pin design in the first place)
    And I came up with the same issue of not enough housing diameter, so I decided to use some GEH15C bearings instead

    Original GEH17C OD 35mm ID 17mm
    Alternative GEH15C OD 30mm ID 15mm

    So the GEH15C bearings will give 4.5mm wall thickness which is plenty
    After removing the ball joints, the inside diameter is around 29mm so once I'd worked out how to hold the TCA in the lathe, it was easy enough to machine out to 30mm and add a circlip groove - it would have been easier with a milling machine, but I don't have one!

    I used the spare pins and turned the shaft down to 15mm and fitted it all together
    I've done 2 pairs so far then got distracted by other things - the last task is to find or make some covers for the bottom of the joint
    The original one's use a nylon cover which is a tight fit into the housing, but the one's I've done only have a few mm before the circlip, so I might have to come up with another plan!









    It's not cheap to do though - the bearings are £19 each from McGill Motorsport, the pins were £25 each, plus circlips and new ball joint boots, so it's over £50 in parts for each TCA
    GavinR

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    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Hi Gavin thanks for that.

    And the pins are the original dimension wise I take it then?

    I found some pins at motorpsort tools an they're £36.50, not cheap by any means but if it means down the road you can just replace the rose joints rather than throwing the whole tca in the bin for the sake of the ball joint then it's worth in my view.

    And I suppose as you say the other issue is making a small caps to go in the bottom of them aswell.

    Thanks
    Rob
    Last edited by rallyrob; 31-07-2020 at 00:44.

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    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    I also found somewhere slighty cheaper for the rose joints too.

    http://www.bearingshopuk.co.uk/catal...=&q=skf+geh15c

    Do you think that with reducing the size of the pins they are still going to be strong enough Gavin?

    I also wondered if they might wear the rose joints out a bit quicker aswell as they're slightly smaller.

    But by the reports of them they last ages anyway, far longer than the ball joints do already anyway.

    Rob
    Last edited by rallyrob; 31-07-2020 at 01:00.

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    no he supplied everything, ready to bolt on car !

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  11. #48
    Pit Crew Decade Plus User GavinR's Avatar
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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    The original pins were 17mm diameter through the rose joints, and now they are 15mm
    I think the Motorsport Tools pins will be 5/8" (16mm), similar to the Grp4 Fabrications fabricated TCA's which use a 5/8" bolt through the joint and strut

    I will fit some of mine to Fly and see which happens!

    If you look at a standard ball joint, or at least the ones I removed from the Rally Design arms, the thinnest part next to the ball is quite small anyway

    I've changed a few of the rose joints over the years, but I think the wear is down to dirt and water getting in there due to the events I do!
    GavinR

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by Mkdu View Post
    no he supplied everything, ready to bolt on car !


    Okay thanks, I kind of thought that really as it wouldv'e have been very expensive for you to send arms to
    him then for him to send them back again.

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    no he supplied everything, ready to bolt on car !

    I realize that I have 2 types of Tca, one is round, other is more square.
    The upper one in pic, has around 2.5 mm at the bottom, and goes higher the more you go at the center of TCA.

    The one not dressed has more at the bottom, 3.5 mm.
    Click image for larger version Name:	tcaa_r.jpg Views:	72 Size:	53.0 KB ID:	85842

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    I bought a pin from motorsport tools, they are bigger than the one we have. But maybe there are several type, I don't know.
    A guy in Finland has some good stuff, I'll search to post the link

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    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by rallyrob View Post
    Hi Gavin thanks for that.

    And the pins are the original dimension wise I take it then?

    Thanks
    Rob
    Sorry I re-read that an shouldn't have put that question in, as I realised you'd said you turned the original pins down a bit.

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by Mkdu View Post
    no he supplied everything, ready to bolt on car !

    I realize that I have 2 types of Tca, one is round, other is more square.
    The upper one in pic, has around 2.5 mm at the bottom, and goes higher the more you go at the center of TCA.

    The one not dressed has more at the bottom, 3.5 mm.

    Ok yes I see what you mean about the round and square type ball joint ends.

    And both of those are the drop forged type are they, or are they welded?
    Last edited by rallyrob; 31-07-2020 at 09:17.

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    https://www.uniball.fi/en/
    I've bought pin's for steering over there.

    the reference for the bearing is "SKF M17 Spherical Plain Bearing (GEH17C)" on MCGill site

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    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by Mkdu View Post
    I bought a pin from motorsport tools, they are bigger than the one we have. But maybe there are several type.
    I wondered about that too as I saw the pins from motorsport tools.

  21. #56
    Racer Decade Plus User rallyrob's Avatar

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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    Quote Originally Posted by Mkdu View Post
    https://www.uniball.fi/en/
    I've bought pin's for steering over there.

    the reference for the bearing is "SKF M17 Spherical Plain Bearing (GEH17C)" on MCGill site
    Ok yes thsoe you've bought there are a larger thread size at the bottom too.


    Gavin machined his original pins down and used a slightly smaller rose joint in them, still leaving enough material around them.

  22. #57
    Pit Crew Decade Plus User GavinR's Avatar
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    Re: In situ adjustable TCA with replacable sphrical bearing instead off ball joint PA

    That's an interesting site

    The bottom thread cannot be bigger on the one's I've done with the smaller rosejoint, otherwise it would restrict the movement of the pin in the housing
    Hence why the circlip ears have been cut down
    GavinR

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