Gearbox breather

Hi all been having problems with oil leaking from speedo drive so have a new oil seal to fit ,does anybody know how it goes on does it push on to gearbox and can you me tell how breather is removed has I want to check if it’s blocked has leak is quite bad . There was no seal when I removed cable from gearbox
Thanks

Have you looked on the Greek X19 club site which has all the workshop manuals to download, the Fiat ones?

Thanks for that mate I have removed pipe from breather and tried to clean has best I can with some wire but can only get in about an inch seem to hit metal at that point ,also checked oil level and replaced seals in speedo drive . After a run i still have oil bubbling out from around cable into drive any ideas seems pressurised to me how can I clean and check breather better
Thanks

Just a thought, your breather pipe...it might have a flame preventing mess so far down the rubber pipe. It could be blocked possibly giving you a slight pressure build up. If you can't remove it to clean it then it might be worth investing in a new mess insert and rubber pipe.

Hi I removed rear wheel so I could access breather and removed pipe completely and pipe was clear , I poked wire directly into gearbox breather but it only goes in about an inch then it stops it’s hitting metal I think so I think it’s clear . Can’t figure out why it keeps leaking if I tighten it anymore it affects speedo doing my head in now Cheers