PT: Exhaust Vincent Head Exhaust Threads

Bill Thomas

Well Known and Active Forum 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 Forum User
Non-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 Forum 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 Forum 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 Forum 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 Forum 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
 
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