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General => Douglas Motorcycles - General Discussion => Topic started by: Darryl on 05 Dec 2021 at 04:31

Title: Non-return oil valve for CW
Post by: Darryl on 05 Dec 2021 at 04:31
Dear All
Was wondering whether anyone could assist me in identifying the brass male/male joiner 7/16 - 20 Tpi (I think) that joins the oil line to the crankcase of the CW Douglas. I am told it incorporate a non-return valve and that a drawing was available on the forum. The only one I can find is this one - Drawings for non-return oil valve, Models CO, 600EW, F28, 350EW posted the 24/10/21 is this valve and dimensions the same for the CW.
Thanks for any assistance you can provide.
Darryl
Title: Re: Non-return oil valve for CW
Post by: cardan on 05 Dec 2021 at 08:00
Hi Darryl,

Have a look at this thread. I think we decided that the TS/CW used the larger thread at the cylinder end, with the EW using the smaller.

https://www.douglasmotorcycles.net/index.php?topic=8919.0

The 7/16-20 thread is pretty common - it's actually a cycle thread.

Cheers

Leon
Title: Re: Non-return oil valve for CW
Post by: Darryl on 05 Dec 2021 at 10:10
Leon
Thanks for the thread link, much appreciated.
Darryl