thread advice

Status
Not open for further replies.
Joined
Aug 6, 2005
Messages
1,211
I had to order one head bolt, I think they are 3/8x26, but it doesn't fit the threads in the cylinder. Next to one of the old bolts the threads sure look the same. I am thinking the plating on the new bolt is a bit thick and wont allow the bolt to thread into the cylinder. I don't have a 3/8x26 die to run this through to try and clean it up. Any other way to make this thing work?
 
You could try running the thread through a wire wheel, or running a 3/8 x 26 nut over the thread a couple of times. If you don't have any spare nuts, the cylinder base nuts and head nuts are 26 tpi

The thing about Commandos is that the engine and gearbox are mostly CEI, but a lot of the other stuff is SAE

I have a set of CEI taps and dies for just this sort of thing. Made in India, off ebay.
 
You may have a hard time. I got some mushroom adjusters and they were 9/32-26 and about 1-2 thou larger than the original adjusters. 3 fit in all the rockers and one didn't. Trying a used rocker arm for that one but am not holding breath. I think the new stock threads tend to be larger diameter than the old stock, don't know why except to irritate. All you can do is try them. If they are hardened like the adjusters and rocker arms, good luck. I have read that the head bolts are a crap shoot.

Dave
69S
 
DogT it does look like the threads are thicker. Keep ordering 7 dollar bolts until one is right? That doesn't sound like a winning proposition.
 
I know what you mean. I got a gearbox drain bolt from RGM that had the thick threads 3/8x20 too and wouldn't fit. I had a local machine shop correct it for too much money. I don't have an answer to the thread issue unless you have your own metal lathe.

Dave
69S
 
I have a basic ww and sae tap and die set. Seems when ever I need a tap or die it isn't in the set I bought. Thanks for the link Ron. I think I'll order the die instead of trying to fix it the wrong way.
 
Seems like our friendly neighborhood parts suppliers should be aware of this. I never leave the hardware store without running nuts on to the bolts I buy to make sure something isn't buggered. Funny how often I find a bolt that has the threads banged up on the end, or a nut that is faulty. Might be worth asking a supplier in the future if they have tested the threads. I dunno if you can get them to do it, but it would be the kind of service I would sit up and take notice of.

Russ
 
rvich said:
Seems like our friendly neighborhood parts suppliers should be aware of this.Russ

I would generally agree, but the last time someone vented on the forum someone got bent out of shape about their products and complaints. Can't see how bolt threads could possibly be user error though and I don't see the problem really being rectified. So I'll try and make my 7.00 bolt work or keep ordering.........
 
britbike220 said:
rvich said:
Seems like our friendly neighborhood parts suppliers should be aware of this.Russ

I would generally agree, but the last time someone vented on the forum someone got bent out of shape about their products and complaints. Can't see how bolt threads could possibly be user error though and I don't see the problem really being rectified. So I'll try and make my 7.00 bolt work or keep ordering.........

There is constructive criticism and there is whining. If you can provide actual details that can be use then that gives the vendor(s) a chance to respond.

I can only tell you that I believe that Andover Norton is a massive benefit to the Norton community. If you don't believe me try to source parts for a make that doesn't have the parts availability of Norton. Not only that but the owner and people who work at Andover Norton are true Norton enthusiasts and want nothing more than to make the best parts at the best price. We've already discussed the challenges of parts sourcing and QC in the current international sourcing chain.

So if you find a part that doesn't fit you have a couple choices:

1. Start a thread and complain about how bad the part is. This may get you some "attboys" but other than that, not productive.
2. Return it to the dealer. We all know which dealers will happily accommodate returns. Use them.
3. Start a thread with explicit details about why the part didn't fit. Include as many details as possible. Keep in mind that there are many variables which can make a part not fit, and it doesn't always mean the part is not made to spec. It is very likely that a part could be made exactly to "factory specs" and still not fit. We are dealing with bikes that were hand assembled and never known for setting the standard for quality control. Manufacturing tolerances may have varied greatly. Add to that the fact that these bikes now have 40 years of wear.

I could go on. :mrgreen:
 
Dave, I am not disputing Andover Norton is a huge benefit to the norton community. I have had good and bad luck with them over the years as I have with other vendors. I do not have the time or patience to call vendors and try and haggle returns. In a lot of cases it is just easier to fix the vendors error myself, but feel I should be able to bring it to others attention so people don't suffer the same frustration. I am still dealing with a well known vendor I ended up doing a credit card dispute against, ultimatley started because of their extremely poor customer service, NOT Andover Norton by the way, but another well known vendor in the USA. I do not need to deal with the extra frustration of trying to convince someone I should get what I pay for after I have already been put behind schedule getting a repair done. At any rate I bought a die to chase the threads of the head bolt and I will get my bike together and running and I will continue to buy Andover Norton products because I, like you, feel they are of benefit to me and others who own nortons. The bottom line is poor quality is not acceptable in any business where consumers or safety is involved. Poor quality means lost business period and if a vendor does not want to monitor their contractors or sub vendors or in house employees then I imagine it will eventually bite them. This is how the company I work for looks at Quality. 8)
 
I did call the distributor I bought the bad head bolt from and explained the problem and they checked their stock. They called me back awhile later to let me know about half of the head bolts they had were also bad and needed to be chased. It appears to be a plating issue on stock bolts. Their stainless bolts were all good. They were going to contact their vendor to let them know there is a problem with their head bolts. I was offered a new bolt, but declined because I already ordered a die to chase the one I have. they did chase all of their stock to be sure things fit like they should.
 
britbike220 said:
I did call the distributor I bought the bad head bolt from and explained the problem and they checked their stock. They called me back awhile later to let me know about half of the head bolts they had were also bad and needed to be chased. It appears to be a plating issue on stock bolts. Their stainless bolts were all good. They were going to contact their vendor to let them know there is a problem with their head bolts. I was offered a new bolt, but declined because I already ordered a die to chase the one I have. they did chase all of their stock to be sure things fit like they should.

You should definitely mention the dealer so that anyone looking for a headbolt can be reassured that it will most likely fit. Not only that but to take the effort to check their stock shows a definite interest in the well being of their customers.
 
britbike220 said:
Old Britt's. I have never had anything but good experiences with them.

You'll be hard pressed to find someone to disagree with that statement.
 
Status
Not open for further replies.
Back
Top