Recommended blind wrist pin puller?

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Kurt Bogerman
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Vintage Karting items owned: 1964(?) Rupp Grand Prix, MC 90, Safari Gearbox.
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Recommended blind wrist pin puller?

Post by Kurt Bogerman » Sat Nov 11, 2017 10:58 pm

Gentlemen,

What wrist pin puller do you recommend for pulling 1/2" McCulloch blind wrist pins? I need one, but there seems to be a lot of junk out there. Which ones work?

Thanks!!!

Rob Voska
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Re: Recommended blind wrist pin puller?

Post by Rob Voska » Sun Nov 12, 2017 8:22 am

Are you asking about the solid side piston or the capped bearing?

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Kurt Bogerman
Posts: 45
Joined: Wed Sep 27, 2017 4:39 pm
Vintage Karting items owned: 1964(?) Rupp Grand Prix, MC 90, Safari Gearbox.
User Agreement: Yes
Location: Harrisburg, PA

Re: Recommended blind wrist pin puller?

Post by Kurt Bogerman » Sun Nov 12, 2017 6:25 pm

I am referring to the solid side piston. Needs to be pulled out, not pressed through.

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Kurt Bogerman
Posts: 45
Joined: Wed Sep 27, 2017 4:39 pm
Vintage Karting items owned: 1964(?) Rupp Grand Prix, MC 90, Safari Gearbox.
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Location: Harrisburg, PA

Re: Recommended blind wrist pin puller?

Post by Kurt Bogerman » Sun Nov 12, 2017 11:11 pm

I purchased a used "Pin Pal" on ebay several years ago. Unfortunately, when I received it, the threads on the mandrel were knackered. Shouldn't these be LH threads anyway?
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Rob Voska
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Re: Recommended blind wrist pin puller?

Post by Rob Voska » Mon Nov 13, 2017 12:29 am

Have a similar one. Threads wore out so I drilled it out & put a stud in there. They work fine. Be sure to lube threads.

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Kurt Bogerman
Posts: 45
Joined: Wed Sep 27, 2017 4:39 pm
Vintage Karting items owned: 1964(?) Rupp Grand Prix, MC 90, Safari Gearbox.
User Agreement: Yes
Location: Harrisburg, PA

Re: Recommended blind wrist pin puller?

Post by Kurt Bogerman » Mon Nov 13, 2017 12:45 am

Rob,

Did your stud have RH or LH threads? Mine has RH threads, though I've always wondered if someone had modified it. Maybe I don't understand how to properly use the tool as a puller, but if the piston/rod assembly is inside the ring with the mandrel inserted through the wrist pin, and you are turning the t-handle counter-clockwise, thereby extracting the pin, won't the nut on the end of the mandrel stud back it's way off?

Thanks for your advice, by the way, on this and my other topics elsewhere.

Kurt

Rob Voska
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Re: Recommended blind wrist pin puller?

Post by Rob Voska » Mon Nov 13, 2017 8:09 am

That special thin small OD nut is put on but first you have to reverse the big nut. Put it face to face and a little grease on the faces don't hurt. Then you "tighten" that large nut (lube threads) to "pull" the wrist pin out. The T Handle don't really move. It takes a little HP to get it moving. Warming the rod with a heat lamp don't hurt things any and an extra hand is helpful also.

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Kurt Bogerman
Posts: 45
Joined: Wed Sep 27, 2017 4:39 pm
Vintage Karting items owned: 1964(?) Rupp Grand Prix, MC 90, Safari Gearbox.
User Agreement: Yes
Location: Harrisburg, PA

Re: Recommended blind wrist pin puller?

Post by Kurt Bogerman » Mon Nov 13, 2017 9:31 am

Aha! I was beginning to wonder if that was the trick. Thank you again!

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Kurt Bogerman
Posts: 45
Joined: Wed Sep 27, 2017 4:39 pm
Vintage Karting items owned: 1964(?) Rupp Grand Prix, MC 90, Safari Gearbox.
User Agreement: Yes
Location: Harrisburg, PA

Re: Recommended blind wrist pin puller?

Post by Kurt Bogerman » Tue Nov 14, 2017 12:46 am

I made a new round nut for the puller tonight and was able to extract the pin, despite the damaged threads. I'll probably have the tool repaired with a new stud anyway, now that the current matter has been addressed. Thanks for clarifying the correct use of the tool, Rob.

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