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Author Topic: Front engine mount bolt size  (Read 672 times)

DanB

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Front engine mount bolt size
« on: October 31, 2013, 01:38:45 AM »
Lost my front bolt nut while commuting today. It's the big nut on the front mounting plates. Anyone know the pitch size?  I want to say its 1/2 inch sae with very fine threads. My local hardware supply was unable to pull through for me this time and the parts manual doesn't spec it out.

I'll get a photo uploaded when I'm back at the PC.
My thanks for the help!

Update: Photo of the missing nut location...
« Last Edit: October 31, 2013, 04:35:46 AM by DanB »
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Arizoni

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Re: Front engine mount bolt size
« Reply #1 on: October 31, 2013, 01:53:54 AM »
The UCE parts book shows several 8mm bolts in that area along with one that is pictorially larger.  They don't say what the larger bolt size is.

8mm is .315 inches or 5/16 for all practical purposes.

If I were you, I'd buy a 5/16", a 3/8" and maybe a 7/16 bolt and try it in the hole.
I'd plan on using the largest size that fits without making any mods to the bike.

The final bolt(s) I would buy would be Grade 5 or Grade 8 fine thread bolts along with a similar grade of nut.
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary

DanB

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Re: Front engine mount nut size
« Reply #2 on: October 31, 2013, 02:51:05 AM »
Thanks Jim. I misspoke. Not the bolt, but the nut that's gone amiss.

It's that large one I'm after. Hitchcocks shows what I think the nut is as 1/2 inch, 26tpi. Never heard of a 26 tpi if this is indeed the bolt I'm looking for. I'd just swap out the bolt but it's trapped behind that stupid lump of the sprag gears for the ES. Ideas? 
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Re: Front engine mount bolt size
« Reply #3 on: October 31, 2013, 05:33:27 AM »
It could be 26 threads per inch.
The older British motorcycles used that pitch on many of them.

Here's a few links about them

https://sites.google.com/site/vintagenutsbolts/

http://www.clubmanracing.com/stainlesspartstypesofthreads.php

There are a few web sites that offer the nuts but they aren't cheap.

http://www.stainlessautomotivefastenings.co.uk/index.php?main_page=index&cPath=342_341

If the bolt is truly a 1/2" size and there is a way to get access to the shank below the head with a hack saw you might try pushing the bolt towards the ES case, grabbing the exposed threaded end on the right side of the bike to keep it from turning and then cutting the head off.
Once the head is off the shank should slip out of the hole.

Without the bolt in the hole, a standard 1/2-20 UNF bolt could be inserted from the right side with the nut end towards the ES case.  Then, a standard 1/2-20 UNF nut could be installed on the exposed end.

If this isn't appealing, I would wait until some of the other guys who own these older iron barrels chime in.  They may know exactly what the thread is and it might be metric.
Jim
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1999 Miata 10th Anniversary

ERC

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Re: Front engine mount bolt size
« Reply #4 on: October 31, 2013, 12:42:01 PM »
I'm pretty sure it's 1/2" BSF.   ERC
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DanB

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Re: Front engine mount bolt size
« Reply #5 on: October 31, 2013, 03:11:33 PM »
Thanks gents. 
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DanB

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Re: Front engine mount bolt size
« Reply #6 on: November 03, 2013, 04:24:41 AM »
Update:  The nut is 1/2 inch, BSF threaded.  In the end, I found the bolt is actually a threaded rod with nuts on both sides;  could have easily slid it out and placed with metric of UNF.  Nxxt time... I found the hardware at a shop called Morries PLace, in Ringwood IL. Vintage European bike shop.  Man, its a candy store and I was drooling all over the place.  BSA, Duc's, Rickman, Truimph, Norton, BMW, Laveria, Panthers, Matchless, AJS... the list goes on. Found a wonderful old RE v-twin.  Im thinking 1930s.

Here are a few shots from this place.  If you're in Northern IL, check it out!

















Suppose I were an idiot, and suppose I were a member of Congress; but I repeat myself. ... Mark Twain
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Arizoni

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Re: Front engine mount bolt size
« Reply #7 on: November 03, 2013, 10:44:28 PM »
Sure are some neat bikes there!  Thanks for the pictures. :)

I think the V-twin is from the 1920's.  By 1930, RE was using the more modern saddle fuel tanks that fit over the top of the frame.
« Last Edit: November 04, 2013, 04:05:03 AM by Arizoni »
Jim
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Re: Front engine mount bolt size
« Reply #8 on: November 04, 2013, 01:23:22 AM »
Cool!  I love seeing those old bikes.
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DanB

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Re: Front engine mount bolt size
« Reply #9 on: November 05, 2013, 04:58:20 PM »
Quote
I think the V-twin is from the 1920's.  By 1930, RE was using the more modern saddle fuel tanks that fit over the top of the frame.

I have this expectation that I should know more about RE history and be able date this thing.  It was a beautiful bike and I've a feeling I'm letting it down by not knowing  ???

The owner of Morries, Ed, has been on the Cafe Racer TV series a number of times.  These guys know their stuff and have a full shop to boot!  http://morriesplacecycle.com/
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Arizoni

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Re: Front engine mount bolt size
« Reply #10 on: November 08, 2013, 01:08:48 AM »
According to ROYAL ENFIELD- The Complete Story , Royal Enfield went to the saddle tank style in 1928 so the bike is older than that.
Jim
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Re: Front engine mount bolt size
« Reply #11 on: November 09, 2013, 02:26:03 PM »
How did I live on the Wisconsin/Illinois border for 31 years and never hear of that motorcycle museum?   ???  I'm disappointed in myself.  Well, I guess I have a reason to go back and visit again.  LOL  ;)  Where exactly is it?

Scottie
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DanB

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Re: Front engine mount bolt size
« Reply #12 on: November 09, 2013, 02:40:17 PM »
Hi Scottie,

It's just north of mcHenry ILL, on route 31 and just south of glacial park. Morries Place
5410 Austin Ct, Ringwood, IL 60072
 http://goo.gl/maps/I8JJx

It's not actually a museum. It's a shop and all those pics I posted are bikes for sale!  That Rickman intercepter is very tasty!  Where did you live in the great Midwest?
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Re: Front engine mount bolt size
« Reply #13 on: November 09, 2013, 02:53:37 PM »
Born and raised just north of Janesville, WI in bumfuck nowhere Milton.  LOL  Spent a few years in the Great Northwoods, moved out to Denver 4 1/2 years ago.  Lived in Rockford for a coupe years too.  Looks like that shop is over by Woodstock and Crystal Lake?

Scottie
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DanB

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Re: Front engine mount bolt size
« Reply #14 on: November 10, 2013, 05:43:39 AM »
Quote
Looks like that shop is over by Woodstock and Crystal Lake?

Yep!  Thats the place.  Drove by it today had a coffee and a chat with Ed. If you're in the area, you gotta stop in!  I picked up a vincent style straight bar today from him.
Suppose I were an idiot, and suppose I were a member of Congress; but I repeat myself. ... Mark Twain
2006 AVL Electra