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I had what I thought was a leaky final drive seal on my new-to-me '07 Breva 750. Thanks to Sign216, I checked the venting fill plug. It was frozen but some gentle tapping and twisting with pliers got it moving. Guess what?? Leaking gone!!I've learned over the years that it's often the simple things that solve the problem. Thanks to the internet and these forums, we can really use our collective wisdom for the benefit of each other. That little tip saved me from an involved and unnecessary job. I AM GRATEFUL!!
Caution.. oil thread.. I only use dino oil with moly in the rear drive of small blocks. That PITA inner seal tends to leak with synthetic.
I guess I'll have to try a dino based oil then.....Unfortunately, the vent wasn't clogged as I'm now seeing oil on the right side of the wheel after every ride.
:1: on that. It was actually Sign that alerted us to the possibility of the blocked vent. Now cleaned each time I do the diff. I am now reassured when I see the faint oil mist deposit around the vent.
Muzz,You are a Master of the 750. A kind word from you, and I feel vindicated.Joe
Someone quite recently did a very nice photoessay on the process. Perhaps someone can point you to it? Somebody will of bookmarked it.
BumpI would appreciate a link to those photos. My B750 is leaking from the final drive.
I've read on the site about cleaning the vent. So I'll try and remove what appears to be a dust cap when I figure out if it pings off or screws off, (don't want to damage it).
replaced it with Dino oil - no further leaks. Why this is the case is a mystery,
You are saying that our seal surfaces are less than pristine! Fie, Fie. Oh, the Shame!Makes sense - came across an early big block that had a persistent final drive leak. Re-sealed & rebuilt multiple times. Problem didn't go away until he replaced the casing.
I assume the large seal is the source of oil leaking on the rear wheel and tire.