Author Topic: SRM oil feed banjo  (Read 1218 times)

Offline t20racerman

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Re: SRM oil feed banjo
« Reply #15 on: 12.04. 2019 09:24 »
As long as the domed nuts are tight on the other end, they shouldn't come loose. Mine never have in many years riding. I always seal the banjo/rocker cover joint with a little anaerobic thread lock type sealant, and if you are concerned about them coming loose, you could put a little threadlock on the angled sealing part of the banjo bolt where it mates with the oil feed pipe. I wouldn't use it on the thread in this situation though.

Adrian
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1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

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Online JulianS

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Re: SRM oil feed banjo
« Reply #16 on: 12.04. 2019 09:39 »
I find that they do come loose after fitting new fibre washers but settle down after being retightened a few times.

I like the idea of drilling the bolts for a lock wire.
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Online Greybeard

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Re: SRM oil feed banjo
« Reply #17 on: 12.04. 2019 10:14 »
I find that they do come loose after fitting new fibre washers but settle down after being retightened a few times.

I like the idea of drilling the bolts for a lock wire.

If the loosening is due to the fibre washer crushing, a locking wire would not help, and in fact, would be a PITA.
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Offline a101960

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Re: SRM oil feed banjo
« Reply #18 on: 12.04. 2019 10:57 »
The only way I could get a good permanent seal was to use Dowty washers. Stopped the leaks and stayed tight.
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Online berger

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Re: SRM oil feed banjo
« Reply #19 on: 12.04. 2019 11:39 »
I use copper washers but since a geezer gave me a tin full of dowty washers I will try some when I get round to the new build, the copper ones have never let the bolts loosen
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Offline terryg

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Re: SRM oil feed banjo
« Reply #20 on: 12.04. 2019 12:24 »
I've been impressed by Dowty washers having used them on 2000 psi tractor hydraulics. I found they sealed when the clamping nuts were barely more than finger tight. Needless to say, the nuts weren't left that sloppy.
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Re: SRM oil feed banjo
« Reply #21 on: 12.04. 2019 13:48 »
For the rocker banjo unions, what size dowty washer should I be looking for?
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Online bsa-bill

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Re: SRM oil feed banjo
« Reply #22 on: 12.04. 2019 15:10 »
I have Dowty washers in the shed but have never had a problem with copper ones, should there ever be that much pressure in there to trouble the seals, yes the box is prone to leaks but is that not more to do with movement from spring pressure and gaskets
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Offline a101960

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Re: SRM oil feed banjo
« Reply #23 on: 12.04. 2019 15:11 »
Quote
For the rocker banjo unions, what size dowty washer should I be looking for?
I will let you know tomorrow. In fact I might even have a pair lying about in the garage.
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Offline t20racerman

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Re: SRM oil feed banjo
« Reply #24 on: 12.04. 2019 16:47 »
I have never had washers on mine - straight banjo to casing, with anaerobic sealer to hold in place. I built this bike out of a box of bits in '83/84 and used whatever I had to hand - or not as in this case. I didn't realise that there should be washers there, but as that seal has never let me down, or come loose, in the 35 years I've had the bike, I'll leave it as it is.  *smiley4*

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1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

"If I had all the money back that I've spent on motorcycles... I'd spend it all on motorcycles!"

Offline duTch

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Re: SRM oil feed banjo
« Reply #25 on: 12.04. 2019 23:06 »

 
Quote
If the loosening is due to the fibre washer crushing, a locking wire would not help, and in fact, would be a PITA.

 I decided losing a bolt or two was more of a pain, and it's not wired but just a locking clip, and all flats are drilled so all options covered to be a *fairly* straight push through and lock....

  I've said before that being unable to easily source fibre washers I made my own from 1/16" nitrile sheet and slightly oversize OD and the holes snug on the straight shaft bit before the taper- seems to work for me and haven't touched it in a few thou miles

 There was a discussion soon after that about the dowty washers and I think the size 11/16" comes to mind- maybe BSP  *????* which didn't sound right to me, but was no further debate....

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Offline Peter in Aus

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Re: SRM oil feed banjo
« Reply #26 on: 13.04. 2019 01:55 »
I use "O" rings
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Re: SRM oil feed banjo
« Reply #27 on: 13.04. 2019 07:16 »
G'day Peter.
Don't the o rings squash out when you tighten the bolts?
I use thin fiber washers with a smear of grease.
Cheers
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Offline terryg

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Re: SRM oil feed banjo
« Reply #28 on: 13.04. 2019 09:02 »
As I understand it O rings are intended to mount in a  carefully designed and dimensioned retaining groove. The O ring is not supposed to be a tight fit but able to deform under fluid pressure to ensure a seal.
Machining the rocker box to take O rings sounds like a nice solution.
When I get that Bridgeport vertical mill I keep promising myself I'll have to give it a try.
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Offline Peter in Aus

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Re: SRM oil feed banjo
« Reply #29 on: 13.04. 2019 13:06 »
G'day Peter.
Don't the o rings squash out when you tighten the bolts?
I use thin fiber washers with a smear of grease.
Cheers

I fitted a flat washer that just fitted inside the banjo allowing a fairly thick O ring to fit in it and squash out sealing it. from memory I think it was a 7/16 washer.
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Busselton West Australia
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58 A10  SA