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Oil tank filter nut

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Can someone please tell me what size socket I need for the oil tank filter nut

thanks in advance

 

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A 71 Roadster takes the later oil tank. Two M26 Dowty washers will replace the copper or aluminium washers and provide an oil tight seal.

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Download this PDF, get a cheap digital caliper and you will never need to ask for the spanner size of a fitting again, plus be able to see the close enough sizes that could work if the exact spanner size is not avaiable.

 

https://www.crawford-space.co.uk/old_psc/spanner-jaws.pdf

Combine that with a Thread gauge for £8 to £10 and you even get to see what abominations the Dump previous owner has inflicted on your bike with retapping to different threads.

 


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