Neck Length

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white1j0
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Neck Length

#1

Post by white1j0 » Mon Apr 09, 2012 8:25 pm

Hi out there,I'm new to this forum, i'm putting together a '52 Pan in a '56 frame I want to keep the original front end w/ the original tins, I had to replace the neck and I was wondering if anyone knows the exact length of the neck, any help would be greatly appreaciated, Thanks Whitey
neck.jpg
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cdndewey
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Re: Neck Length

#2

Post by cdndewey » Mon Apr 09, 2012 9:06 pm

I come up with 5.625".

Hog54
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Re: Neck Length

#3

Post by Hog54 » Mon Apr 09, 2012 11:56 pm

With a tape measure I get 5 11/16ths. :D


Just kidding.Acording to this blueprint,its supposed to be 5.650.


Image

Bigincher
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Re: Neck Length

#4

Post by Bigincher » Tue Apr 10, 2012 12:59 am

That's not an HD frame blueprint with the 5.650" number....!!

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Re: Neck Length

#5

Post by Bigincher » Tue Apr 10, 2012 1:02 am

What are your concerns, Whitey?
Your measurement is okay, a few thousandths isn't going to make much difference.
Just be sure you use the correct bearings and races in the cups, and you'll be fine.

Bigincher
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Re: Neck Length

#6

Post by Bigincher » Tue Apr 10, 2012 1:04 am

Another question..........
Where did you get the replacement steering head?

Hog54
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Re: Neck Length

#7

Post by Hog54 » Tue Apr 10, 2012 2:47 am

Bigincher wrote:That's not an HD frame blueprint with the 5.650" number....!!

Yeah but its accurate from what I was told.

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Re: Neck Length

#8

Post by Bigincher » Tue Apr 10, 2012 3:10 pm

Hog54 wrote:
Bigincher wrote:That's not an HD frame blueprint with the 5.650" number....!!

Yeah but its accurate from what I was told.
I'm sure it's close enough to be considered 'accurate'.
The original HD print is so hard to read, but to me it looks like it says there's a range of 5.642 to 5.648.
So, like I said a couple thousandths won't make much difference.

white1j0
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Re: Neck Length

#9

Post by white1j0 » Tue Apr 10, 2012 4:39 pm

Thanks for all the info. The neck came from a private vender on ebay, I also purchased a pair of neck cups and bearings from ebay which wouldn't work with the stock triple tree tins, the mounting holes on the tins were about 3/16" off, I wound up buying a pair of cups that are an exact repop of the originals, this only solved half my problem, I only lost about 3/32" with the new cups and bearings, as it turns out,the neck should be 5".625 from the info. I got on this forum, my neck is exactly 5" .700 which is about 3/32" to long, I'll have to find a way to resolve this problem now.By the way, this is a really great site, with a lot of good information, Thanks Whitey

Bigincher
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Re: Neck Length

#10

Post by Bigincher » Wed Apr 11, 2012 4:50 pm

Whitey, --- revisiting this issue--
My '52 frame is still bare, so I measured the steering head height. Funny how it measures a few thousandths different as I measure in different areas, but I get readings between (surprise here) 5.642 - 5.648. That exactly matches what I see on the mostly-illegible copy of the HD frame blueprint.

So yours reads 5.700 which is fat by .052", or less than 1/16", by my reckoning.

I was at Wasco Frame yesterday, and brought up this subject with Dick, and how to rectify it. I asked him about turning down the bearing cups, but he said there isn't really enough meat in the cups to be losing much material from.
He also told me that since the new steering head is already installed on the frame, it would be next to impossible to fixture the frame on a milling machine, so it would just about have be a 'hand job' of removing excess material. But you have to know 'where' it's fat--- there is a specific dimension between the top of the steering head and the top of the dash base block where the damper pin is pressed in. He has a special guage he uses for that. I don't know that dimension, but I can ask if you need to know.

Hope this helps, and hope you find a good solution.

white1j0
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Re: Neck Length

#11

Post by white1j0 » Fri Apr 13, 2012 2:52 pm

New cups, new races, new bearings, still not even close, any sugestions
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Bigincher
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Re: Neck Length

#12

Post by Bigincher » Fri Apr 13, 2012 3:29 pm

Assuming the fork brackets (triple trees) are original OEM Harley-Davidson, as well as the fork tins, and all your other parts--- and since you've confirmed you have the correct bearings and cups (I'd double-check that), then I see only one option--- machine the steering head.
I'm not a machinist, but I think there are some good ones here. But I do think it's next to impossible to jig a frame up in a milling machine in such a way to remove material from the steering head with a mill. If I'm wrong, someone please enligthten me.
If that's not an option, you'd have to have a go at it by hand. When I discussed this with Dick at Wasco Frame, he told me the way he would approach it is "by hand". After carefully scribing a 'stop line' around the head, he would start with a parting wheel on a hand-held grinder and cut it off within 10 or 20 thousandths of the cut line, then use a mill file to bring it in, constantly checking with the calipers. And finally finishing off with a stone.
Sounds crazy to me, but I've worked with Dick, and his 40-some years experience gives him the 'skilled hands' that makes that kind of stuff look easy. He's blown me away with some of the things I've watched him do..!

But again, you also need to know if the top of the steering head is indexed correctly off the dash base casting. There's a specific number for that (I can get that for you later if you like) and if it's good, then the excess material would be removed from the bottom--- which looks to me like the easiest place to do it.

That's all I can think of.

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Re: Neck Length

#13

Post by Hog54 » Fri Apr 13, 2012 4:27 pm

Looking at the bottom of his neck,it looks about right.If you mess with the bottom,you risk the neck lock not lining up with the hole in the front end.Looking at my frame,the top of the yours is alot longer.Lets see a better side view of you neck.

Hog54
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Re: Neck Length

#14

Post by Hog54 » Fri Apr 13, 2012 4:56 pm

If you look at your neck and then you look at this one,you will see yours protrudes alot more above the tank,speedo mount.It should be almost even as the arrow is pointing.And are you sure thats a stock harley tin?Thats about how much an aftermarket one misses by.They never cover the tops of the leg tins.Plus the fact that hole in the tin is like a quarter inch off,not a few thousandths.


Image

Bigincher
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Re: Neck Length

#15

Post by Bigincher » Fri Apr 13, 2012 5:48 pm

Hog54 wrote:If you look at your neck and then you look at this one,you will see yours protrudes alot more above the tank,speedo mount.It should be almost even as the arrow is pointing.And are you sure thats a stock harley tin?Thats about how much an aftermarket one misses by.They never cover the tops of the leg tins.Plus the fact that hole in the tin is like a quarter inch off,not a few thousandths.


Image

Bad example to show, Hog54.
I recognize that frame you're showing, it was just on eBay. And the dash mount casting has been replaced--- that is not a pristine steering head...!

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