 alternative firewall bearing for PMS -6 conversion linkage |
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| arbitrary |
 May 9 2022, 10:46 AM
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#1
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Member  Group: Members Posts: 81 Joined: 25-April 21 From: UK Member No.: 25,475 Region Association: None 
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My fairly-new-to-me -6 conversion has a Patrick Motorsport linkage. I would politely offer that it's not their finest piece of work. One of its shortcomings is that the firewall bearing is a spherical bearing in an aluminum holder. Thus there's metal to metal contact and after what I think are less than 1800 miles there is noticeable wear on the shift rod/tube.
I can see the logic behind using a spherical bearing; it allows for any slight misalignment of the rod from horizontal. But the metal to metal contact is crazy. Any thoughts on an alternative solution? Attached thumbnail(s)  
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| ChrisFoley |
May 9 2022, 10:51 AM
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#2
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I am Tangerine Racing Group: Members Posts: 7,933 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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Mine uses a plastic spherical bearing but I open the ID to fit a stock tunnel shift rod. My unmodified bearing might fit in the PMS housing though.
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| Steve |
May 9 2022, 03:23 PM
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#3
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914 Guru Group: Members Posts: 5,596 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California
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I have the same PMS setup on my six. I think its the same as the one on speedway which is 3/4" ID. https://www.speedwaymotors.com/Firewall-Mou...-Size,6845.html
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| arbitrary |
May 9 2022, 07:03 PM
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#4
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Member Group: Members Posts: 81 Joined: 25-April 21 From: UK Member No.: 25,475 Region Association: None
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That’s a great find @Steve - looks identical. The shift rod is indeed 3/4” in diameter and the bearing’s OD is 1 7/16”. And note it’s meant for a steering shaft that merely rotates, not a shift rod that slides in and out.
@ChrisFoley , what are the dimensions of your bearing? I have found products like https://www.igus.co.uk/product/391?artNr=EGLM-20 and https://www.igus.co.uk/product/381?artNr=EFOM-20 but they’re all either for 17mm or 20mm shafts. |
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| jhynesrockmtn |
May 9 2022, 07:25 PM
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#5
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Member Group: Members Posts: 420 Joined: 13-June 16 From: spokane wa Member No.: 20,100 Region Association: Pacific Northwest
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My 6 converted vintage race car uses Chris's bearing and behind the firewall rod and shift console thingamabob. Lot's of fun well engineered stuff.
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| porschetub |
May 9 2022, 08:07 PM
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#6
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Advanced Member Group: Members Posts: 4,702 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(jhynesrockmtn @ May 10 2022, 01:25 PM)  My 6 converted vintage race car uses Chris's bearing and behind the firewall rod and shift console thingamabob. Lot's of fun well engineered stuff. (IMG:style_emoticons/default/agree.gif) have same part works well,metal on metal that's just bad engineering ,the op could buy a larger od bearing and fit a pre-sized nylon bush,pretty sure you can find a bearing to do the job. Good luck. |
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| arbitrary |
May 10 2022, 07:09 AM
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#7
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Member Group: Members Posts: 81 Joined: 25-April 21 From: UK Member No.: 25,475 Region Association: None
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In the short term I’m tempted to get a small piece of Delrin play to replace the entire bearing. Longer term I’ll need something more permanent.
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| Steve |
May 10 2022, 07:30 AM
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#8
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914 Guru Group: Members Posts: 5,596 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California
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QUOTE(arbitrary @ May 9 2022, 06:03 PM) That’s a great find @Steve - looks identical. The shift rod is indeed 3/4” in diameter and the bearing’s OD is 1 7/16”. And note it’s meant for a steering shaft that merely rotates, not a shift rod that slides in and out. @ChrisFoley , what are the dimensions of your bearing? I have found products like https://www.igus.co.uk/product/391?artNr=EGLM-20 and https://www.igus.co.uk/product/381?artNr=EFOM-20 but they’re all either for 17mm or 20mm shafts. Check with PMS. I think they sell both shift rods. One for the stock bushing and one for the metal bearing. I am also curious if you could just use a stock shift rod and make it work with the CFR bushing and PMS shift rod to your side shifter? |
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| ChrisFoley |
May 10 2022, 08:05 AM
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#9
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I am Tangerine Racing Group: Members Posts: 7,933 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(arbitrary @ May 9 2022, 08:03 PM) They're IGUS KGLI-12, which I believe has standard dimensions just like the one used by PMS. |
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