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DAMadd Offline OP
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Winding down my 68ish (numbers 68, tank and taillight 67) A65T project, built from a roller with motor and bins of parts (aka someone's inomplete project, I as a glutton for punishment took on) in the parts was 2 new Ewarts style petcocks with a smaller thread and adapter to the tank size. In the bag with them was 2 dowty washers the smaller size that would seem to go between the smaller part and the adapter. Should there be another between the tank and adapter? The adapter has a hex that would sit awkwardly under a much larger dowty washer and adding a flat thrust type washer would start to take increasing threads away from being engaged. Anyone have experience with the adapters? I'm of the use what you got, cheap economically challenged school and this isn't my only project ( just the closest to firing up)


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Sounds as though they bought Triumph taps for a BSA tank. KC sent me a couple of old BSA taps to measure. They are 3/8 BSPP to the tank were as the Triumph taps are 1/4 BSPP.
Originally had a Dowty washer between the flange on the 3/8 BSPP tap and tank. The 1/4 BSPP taps do not have a flange, a nut instead.

Last edited by DMadigan; 11/20/21 12:41 am. Reason: corrected 1/4->3/8 and 1/8->1/4 BSPP
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The adaptors I have used in the past for fitting 1/4"BSP Triumph petcocks to the BSA tanks, which accept 3/8" BSP Ewart's push-pull taps used a fiber washer against the petrol tank. The part number for the fiber washer is 24-8504. With no pictures, we are guessing the configuration you are trying to make work.
-Dave


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DAMadd Offline OP
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Link to pics. https://postimg.cc/gallery/0mzxJTR
Just thinking even a fiber washer under the adapter does not leave many threads to engage in the tank
First pic was the stuff in a stapled bag from PO
Second showing a 3/8 dwty washer that the metal barely touches the hex
Third how it would stack.
I thinking thread sealer on the adapter and the copper sealing washer between

Last edited by DAMadd; 11/20/21 4:17 pm.

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1st pic [Linked Image from i.postimg.cc]
2nd pic [Linked Image from i.postimg.cc]
3rd pic [Linked Image from i.postimg.cc]

the dowty may need a washer on the hex first , under the dowty , to work by spreading the compression better .
this would use even more of the thread ... you dont have .
so ... i would try a thread sealer alone , ( not a thread locker) ... something like LOCTITE 567

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Some of the Ewarts peacocks have a much larger mating surface; peacock/washer/tank. See the large flange on this example. It uses the Red fiber washer, and of course is Fiddly about pointing in the correct direction when leakproof tight.

7F434DB4-B06A-4071-9564-69C1A919EA74.jpeg
Last edited by KC in S.B.; 11/20/21 8:59 pm.

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I have fiber washers under my adapters and they work. Under the petcock nuts, you need the Dowtys, or those rubber-filled copper "squish" washers (I don't know what you call them).


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
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DAMadd Offline OP
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That's what I'm going to do. Hate getting to this point and realizing you have to wait for parts to show up. So close to hearing that rumble. Thanks for the tips. The fiber washers are thinner than the dowty washers so ultimately enough threads engage. I use some gas and pressure resistant thread sealant (some can be seen on adapter in the pics) because I don't like repeating the same jobs over again. Learned that on my tr6 tanks. HVAC guy gave me some sealant ideas.


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