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Fulcrum pin


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#61 red13

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Posted 11 February 2018 - 08:43 PM

All this info is great and I rebuilt,my lingpins using mikes vidz. Recently there was a discussion of these pins. Some one informed me,about bycicle crank cotterz. https://www.amazon.c...m/dp/B000WY8FOM

#62 2wheel-lee

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Posted 11 February 2018 - 10:14 PM

All this info is great and I rebuilt,my lingpins using mikes vidz. Recently there was a discussion of these pins. Some one informed me,about bycicle crank cotterz. https://www.amazon.c...m/dp/B000WY8FOM

 

I don't remember too much, but I do remember from working in a bicycle shop in the 80s that there are different tapers for these crank cotters. I vaguely remember the French tapers being different than the Japanese tapers (we were a Peugeot dealer, if you remember their bikes). I vaguely remember having a few drawers dedicated to cotters. I was recalling this same thing when I was rebuilding my fulcrums. 

 

The term "cotterless cranks" stuck around decades after those old things were last used on bikes. 



#63 mklotz70

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Posted 11 February 2018 - 11:22 PM

The ones for the bicycles are typically the bigger size.  They might work for the kingpin, but the kingpin rebuild kit always comes with new cotter bolts.  The ones that are the real pain are the ones that hold the fulcrum pin at the bottom of the dogbone.  I made a bunch years ago and still have some.  I haven't put them on the site because I was afraid they'd sell out too quick and I wouldn't have time to make more. LOL  I've been hoping to get a bunch more made and then put them up.  Maybe I'll put them up....sell out.....then when more are needed, make more.  Maybe they won't sell out.  Hmm....I do need to hang onto enough for what I need!


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#64 Drummerboy4as

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Posted 13 February 2018 - 12:06 PM

After fighting and fighting the lower cotter pin I finally beat it. 

 

Whats the worst that that could happen??

gDUoquR.jpg

 

After drilling a hole through the pin, some gentle persuasion convinced it to break its bond

d1poJ4E.jpg

 

Carnage

4Mu7hAx.jpg

GAOheCr.jpg

 

Somehow by the grace of the gods of Datsun I managed to not damage the kingpin at all


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#65 banzai510(hainz)

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Posted 13 February 2018 - 12:08 PM

I use lots of anti seize when putting this back together as I had to swap it out again.( I daily my 521truck)


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#66 mklotz70

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Posted 13 February 2018 - 08:27 PM

Great work!

I hope you're keeping track of which is the front fulcrum pin nut and which is the back.....as well as which direction the pin goes.  It will make it much easier when going back together.

 

I find it interesting that it's a 620 spindle, but it has zerk fittings on the side of the top bushing......AND the cover bolt at the top.  Maybe that's a vent.  If I remember right, my 620 spindles have the zerk on the top and not on the side.


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#67 Drummerboy4as

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Posted 13 February 2018 - 08:41 PM

I’m not, but I’m also installing new fulcrum pin/nuts, so hopefully it won’t make too much of a difference.

To my knowledge these parts have never been off the truck. I bought it from the original owner who bought it new in ‘73. It’s definitely never been cleaned in there lol
If you like I can snap a bunch of pics before I reassemble everything.
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#68 mklotz70

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Posted 13 February 2018 - 11:43 PM

I'm not sure if it continued to the 620's, but the early trucks had different fulcrum pin nuts for the front and back of the arm.  I think the ones with the zerk fitting are the rear ones.  

 

Don't be surprised if the dogbones bind up when you tighten the nuts up on each side.  You may have to mix n match the nuts and pin positions.  The challenge is that the nut threads into the arm at the same time it's threading onto the pin.  If they don't "clock" just right with each other, the pin gets really tight and it will be really hard to swing the dogbone.


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#69 Drummerboy4as

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Posted 14 February 2018 - 09:51 AM

It would appear that it did not, all 4 nuts have zerk fittings
IkDg9UG.jpg

I’ve watched your video on fitting the fulcrum pin so I’ll def mix and match and test fit till the dogbones move freely.
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#70 mklotz70

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Posted 14 February 2018 - 12:41 PM

I never looked into it much, but there was definitely a time when only one side had them.


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