Petrol tap gauze filter thread
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Petrol tap gauze filter thread
I have inherited a push-pull petrol tap and a gauze filter to fit to it but the filter has no thread in it at the moment to screw the filter into it & so I will have to tap the filter to take the filter
The thread on the filter is 1/4 x 40TPI as best I can measure. Is this 1/4 x 40TPI ME (Model Engineers) thread or something else altogether?
Rod
The thread on the filter is 1/4 x 40TPI as best I can measure. Is this 1/4 x 40TPI ME (Model Engineers) thread or something else altogether?
Rod
Re: Petrol tap gauze filter thread
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Last edited by Les H on Sun Jul 24, 2022 9:36 am, edited 1 time in total.
- simon.holyfield
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Re: Petrol tap gauze filter thread
Can you show us a picture? Filters are usually soldered into the top of the tap...
cheers
Simes
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Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
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Re: Petrol tap gauze filter thread
The double tap with reserve has a soldered brass mesh filter. Some single taps have the fine 1/4" internal thread. I've sometimes fitter lawn mower nylon filters to them.( Screw in) satisfactorily. Nev
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Re: Petrol tap gauze filter thread
I have seen filters soldered into taps. I think soldering would a tricky business with gauze and such a small fixture and I am not sure how that would have been done originally. I think I would make a mess of it.
I think I have seen instances where the filter was screwed in & could be removed. I'd feel safer trying to tap a thread in the petrol tap recess & that's why I wanted to be sure what the thread was. (The thread on the petrol tap that screws into the petrol tank boss is 1/8 BSP, by the way).
The thread diameter on the brass/copper filter is 1/4" O.D. as best I can measure. The only 1/4" O.D. x 40 TPI thread I can find reference to is M.E. 1/4 x 40TPI.
Thanks for the lawn-mower filter tip, Nev.
I don't know how to up-load a photo, Simon.
Rpger
I think I have seen instances where the filter was screwed in & could be removed. I'd feel safer trying to tap a thread in the petrol tap recess & that's why I wanted to be sure what the thread was. (The thread on the petrol tap that screws into the petrol tank boss is 1/8 BSP, by the way).
The thread diameter on the brass/copper filter is 1/4" O.D. as best I can measure. The only 1/4" O.D. x 40 TPI thread I can find reference to is M.E. 1/4 x 40TPI.
Thanks for the lawn-mower filter tip, Nev.
I don't know how to up-load a photo, Simon.
Rpger
Re: Petrol tap gauze filter thread
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Re: Petrol tap gauze filter thread
Roderick.Bradley wrote: ↑Sun Jul 24, 2022 9:22 am (The thread on the petrol tap that screws into the petrol tank boss is 1/8 BSP, by the way).
Cough, Cough, Mr Bradley...As said by me, the USUAL thread size on a petrol tap is 1/4 BSP
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Re: Petrol tap gauze filter thread
Yes, Les, you're right. 1/4 BSP is the usual petrol tank tap thread size. But for reasons in the past only to be guessed at, it's a 1/8 BSP in this instance. Not the best size.
I think I will go ahead with tapping the other (filter) end of this petrol tap to 1/4 x40 TPI M. E. to be able to screw in the filter.
Rod
I think I will go ahead with tapping the other (filter) end of this petrol tap to 1/4 x40 TPI M. E. to be able to screw in the filter.
Rod
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Re: Petrol tap gauze filter thread
All Ariels, except the 2 strokes used, 3/8 BSP, yes 1/4 is more common on the more common sort of motor cycle but not on the better sort. That is the end into the tank, the outlet is usually 1/4 except on the post war Colts when it is push on and the 1954-58 SQ4 when it is 3/16 BSP, which is a bastard thread frequently misnamed 7/16 BSP because it measures 7/16 but as we all know that is not how pipe threads are named!
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