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PT: Exhaust Vincent Head Exhaust Threads

Roslyn

Well Known and Active Website User
Non-VOC Member
I am soon to move my bike into the shed ready to try and fix it and one of the things that need doing is the threads on both heads and any advice as to where to to get them repaired as it will the first time i will have stripped a Vincent engine down by my self without any sort of support.
 

Bill Thomas

Well Known and Active Website User
VOC Member
I think we have all crossed the threads on the exhaust at some time ?,
They are not the best made part of a Vincent.
It's what you do after that counts, Take your time and think hard,
It being alloy you can start cleaning the threads with a sharp screwdriver,
And a wire brush.
With the exhaust off and just a nut of the right size, Get used to winding it in and out.
Good Luck, Bill.
 

Monkeypants

Well Known and Active Website User
VOC Member
I think we have all crossed the threads on the exhaust at some time ?,
They are not the best made part of a Vincent.
It's what you do after that counts, Take your time and think hard,
It being alloy you can start cleaning the threads with a sharp screwdriver,
And a wire brush.
With the exhaust off and just a nut of the right size, Get used to winding it in and out.
Good Luck, Bill.
They might give trouble now and then but I'll take the Vincent setup over Norton or BSA anyday. I suspect that as long as people don't crossthread the roses on installation and always keep things snug, there would never be a problem.
With a 70 year old bike, it's likely that at least one of the above occured at some point in history.

Glen
 

Bill Thomas

Well Known and Active Website User
VOC Member
The angle of the flange is so important, Just a little bit out can send the pipe into the air !,
I did my new Comet a few months ago, And it took a few goes to get it nice under the gearbox.
As we found with Gary in Canada, It can go from , "Never Fit ! ", To perfect.
 

Chris.R

Well Known and Active Website User
VOC Member
I saw the other day, Albervin, Say use 2 washers, I would not,
It leaves less thread to grip, We need all the thread we can get !.
I think I used a thread chaser, To clean the threads, They are cheap to buy,
Also make sure the pipe flange is square to the inside hole, To give max' thread contact,
Never use a spanner till you are sure it's in square.
What is a thread chaser and where to get one if needed.
Chris
 

Bill Thomas

Well Known and Active Website User
VOC Member
Sorry Chris , Just looked up a thread chaser, At Feked.com Don't think they would work on an inside thread,
The cutting bits go the other way, Can't remember what I did,
In the past I have just used a sharp screw driver and done it by eye,
Also you don't want to make the hole any bigger,
It's for use on crossed threads, I don't think yours are crossed ?.
 

oexing

Well Known and Active Website User
VOC Member
I had that obsolete thread chaser, a lathe tool from olden times, for dressing fu***dup threads. You could do same with a smaller tap with same pitch in a hand chuck and use one straight flute for dressing damaged spots. Also here some imperial thread files are available, see link. The ends are used for internal threads, don´t remember the pitch on exhaust ports though.
Thread chaser
Vic
 

Chris.R

Well Known and Active Website User
VOC Member
Sorry Chris , Just looked up a thread chaser, At Feked.com Don't think they would work on an inside thread,
The cutting bits go the other way, Can't remember what I did,
In the past I have just used a sharp screw driver and done it by eye,
Also you don't want to make the hole any bigger,
It's for use on crossed threads, I don't think yours are crossed ?.
You are right the threads are not crossed In the past on plumbing work I have used either a stanley knife blade or a small wire brush here a copper brush would suffice. I will try as you suggested earlier tighten the exhaust nut before fitting the fixing at the other end of the pipe to the engine plate and see how that goes.
Chris
 

Chris Launders

Well Known and Active Website User
VOC Member

Chris.R

Well Known and Active Website User
VOC Member
Chris R,
The previous owner of mine was a die maker and he made a thread chaser especially for the job, you can borrow it to clean out your threads providing I get it back reasonably soon (weeks rather than millennia)

Chris.

View attachment 42523
I am working on it here Chris I am hedging towards a visit to you on 21 or 22 June on my way north I will give you a call after I have sorted out the eventual destination in Morpeth with Tom.
 

vibrac

Well Known and Active Website User
VOC Member
Rofor engineering fixed mine with the bike still on the trailer they are in Milton Keynes "someday all citys will be like this"( I B well hope not!):)
 

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