crankcase ?breather( part 10390-54)

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John M
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crankcase ?breather( part 10390-54)

Post by John M »

Hi
1958 Ariel FH HCS engine
On the drive side to the rear the engine has a mauled brass stump with an internal thread and an oil line pipe olive female shape projecting from the crankcase.which appears to be a breather pipe. Should this stump unscrew? Do I dill it out?
It is obviously beyond use but I cannot see any reference to it apart from an "oil line type" pipe which fixes onto it. Part 10390-54.
All suggestions welcome.
Thank you all.Image
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JohnnyBeckett
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Re: crankcase ?breather( part 10390-54)

Post by JohnnyBeckett »

ih i think it screws out , but your one looks like someone has had a go at trying to get it out , you can try and heating up the casing and use a pair of small stilsons, to undo it , or braise a nut or bolt on it and tuy and undo it if not you will have to drill it out and re tap it
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Re: crankcase ?breather( part 10390-54)

Post by Roger Gwynn »

mmmm never noticed before but there does not appear to be a number for the breather union listed anywhere. The 1956 parts book lists a fibre washer for it but not the union.
It is the crankcase breather and heating the case may well help as the ally will expand a little more than the brass but not by much, however it may well break the bond between the 2. I wonder if it cast in? Unlikely, I think but a long time since I played with a Huntmaster.
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Re: crankcase ?breather( part 10390-54)

Post by Mick D »

Hi

It should just screw out - here's a photo of an unmullered one for info:
Breather.png
Breather.png (335.96 KiB) Viewed 706 times
Sorry, didn't record the thread details during my restoration.

Regards Mick
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Re: crankcase ?breather( part 10390-54)

Post by keith wainwright »

That would be either 1/4" or 3/8" BSP.
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Re: crankcase ?breather( part 10390-54)

Post by nevhunter »

If it was intended to be screwed out it would have a hex on it. It may well be cast in with a ball valve there originally,, Nev
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Re: crankcase ?breather( part 10390-54)

Post by Adz.F »

Looks to me to be screwed rather than cast as the case has been machined flat where a nut would squarely mate to it?
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Re: crankcase ?breather( part 10390-54)

Post by nevhunter »

That "spot facing"could still have been done to get a definite dimension. I reckon there's been a ball valve in there. Glass without a spring? Nev
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Re: crankcase ?breather( part 10390-54)

Post by JohnnyBeckett »

hi it maybe a taper fitting that someone has fitted or a bulkhead fitting that you use a nut on each side of the fitting that has been screwed in with some loctite :?: but i do know the original one screws in
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Re: crankcase ?breather( part 10390-54)

Post by Simon.Gardiner »

And sorry, Nev, there's no valves in 'em as such - but internally it come across from the timing side where there's a disc that times the venting through it.

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