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Thread: TH CVD and Dogbone pin replacements

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Old 04-14-2013, 03:04 PM   #1
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Default TH CVD and Dogbone pin replacements

So yesterday at the Nor-Cal comp, donzx12 and GIXXERSTUNTIN asked me for some help with the Twin Hammers CVD. Don gave me a new one, and gixxer gave me an axle with a broken dogbone pin.

The CVD pin was easy, my 1/16" Axial pins fit just fine. My pin on the left:



On the used CVD, it wasn't too hard to get the dogbone pin out. Sometimes these pins can be a real bitch to remove. I applied a small amount of heat, and luckily the pin came out easily. Then I made some pins up:



On Don's new CVD, I wasn't as lucky. Usually, the easiest way to remove a non-broken pin is to grind one side of the pin down to a slightly smaller diameter, then tap it out hitting that side. Generally you can do this cold, but sometimes the pin is really in there, and you need to use some heat to help it along. Unfortunately I did neglect this first step...

I gathered some tools together and got to work:





It was very difficult to get this sucker out, I was about to give up, but finally I was able to get the pin out, but did do some damage to the ball. Hopefully this will hold up for Don:



Here is the completed job, gixxers on top, Don's on the bottom:



I will get these back to them to test, and see if they last. If they approve, then I'll put them into my vendor thread:


Last edited by gunnar; 04-14-2013 at 03:10 PM.
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Old 04-14-2013, 09:09 PM   #2
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Default Re: TH CVD and Dogbone pin replacements

back in my earlier days of 1/8th scale racing I would break pins off and I made a jig that would hold the ball end with a hole drilled. It was hardened metal(I of course don't remember what temper it was), and it held up to me knocking pins out and installing them. Very simple design if you can get ahold of a ball nose end mill.
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Old 04-15-2013, 09:18 AM   #3
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Default Re: TH CVD and Dogbone pin replacements

Yea, I have seen those jigs, and thought of it as soon as they asked about the dogbone pin. Unfortunately, I didn't have the time (or a ball mill) to make one.
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Old 04-15-2013, 11:53 AM   #4
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Default Re: TH CVD and Dogbone pin replacements

cant wait to see if these hold up. I have a axle with a broken cv in my parts box.
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Old 04-15-2013, 07:08 PM   #5
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Default Re: TH CVD and Dogbone pin replacements

i have broke 5 pins and then put gunners pins in and never broke one yet. we will put them to the test. thanks gunner
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Old 04-15-2013, 07:33 PM   #6
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Default Re: TH CVD and Dogbone pin replacements

A piece of cheap home depot aluminum angle iron over each jaw will keep the vise from rapeing what it holding.
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Old 04-16-2013, 06:17 AM   #7
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Default Re: TH CVD and Dogbone pin replacements

I ordered a bunch of the CV pins a few weeks ago and have already received them.... didn't even think to ask about the dog ones. Gunnar, you may be receiving another order shortly.

Also FYI to everyone else, the CV pins are the same spec for rear and center driveshafts. Which is convenient...
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