The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: TimK on 05.12. 2019 00:01

Title: Barrel spigot
Post by: TimK on 05.12. 2019 00:01
Hi Everyone

I picked up a thick flange barrel to replace my current very battered thin flange barrel and it has a small spigot protruding from the pushrod tunnel (see photo).
Has anyone got any ideas what it might have been for?
I was wondering if it may have been part of an additional breather system.
At the moment I'm planning to remove it (it's threaded in) and fit a blank to restore the original look.
Cheers

Tim
Title: Re: Barrel spigot
Post by: KiwiGF on 05.12. 2019 10:09
Hi Everyone

I picked up a thick flange barrel to replace my current very battered thin flange barrel and it has a small spigot protruding from the pushrod tunnel (see photo).
Has anyone got any ideas what it might have been for?
I was wondering if it may have been part of an additional breather system.
At the moment I'm planning to remove it (it's threaded in) and fit a blank to restore the original look.
Cheers

Tim

Extra lube supply for the followers  *dunno* or camshaft? (if the followers are modified with grooves)
Title: Re: Barrel spigot
Post by: muskrat on 05.12. 2019 10:44
G'day Tim.
Doubt it would be a breather as there's a lot of oil/oil mist in there. More than likely Kiwi is right.(but I wouldn't bet my bike).
Cheers
Title: Re: Barrel spigot
Post by: Swarfcut on 06.12. 2019 09:35
Looks a bit big bore for an oil feed, but then again not really a good place to put a breather as a lot of oil mist there which is best left to do its job. Perhaps that was the only bit of tube to hand. As its threaded, blanking off presents no problem, or even a chance to push the boundaries with some experimentation.

Cheers.

Swarfy.
Title: Re: Barrel spigot
Post by: RDfella on 06.12. 2019 18:19
That's screwed into the barrel casting. A PO mod? Or an attachment for the spill tray?
Title: Re: Barrel spigot
Post by: TimK on 07.12. 2019 07:00

Its only threaded on the end that screws into the barrel, so I don't think it would have been an additional fixing for the drip tray.
Title: Re: Barrel spigot
Post by: muskrat on 07.12. 2019 07:56
G'day Tim.
Blank it off and attach a dummy NOS bottle. That'll get'em talking at the Berry Bike Show *ex*
Cheers
Title: Re: Barrel spigot
Post by: BSA_54A10 on 07.12. 2019 08:29
IT would be  a breather tube for a flow through system using the existing timed breather
So it is in through the push rod tunnel & out via the primary
Title: Re: Barrel spigot
Post by: TimK on 07.12. 2019 21:41
IT would be  a breather tube for a flow through system using the existing timed breather
So it is in through the push rod tunnel & out via the primary

So would there have been a pipe from this spigot to another one on the primary case?
Title: Re: Barrel spigot
Post by: BSA_54A10 on 08.12. 2019 03:49
No,
A pipe on it to a check valve fitted to suck not blow
Then either use the Std breather or pop the oil seal between the crank & primay
Put a drain back hole as per 70-72 twins & B 50's then an OUT tube from the primary with a check vale so it sucks only.