The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Greybeard on 16.06. 2019 12:39
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I would like to get a couple of Dowty washers for the rocker banjos. I could buy a selection box but would probably never use most of them. When I've looked for specs the washers are shown in BSP pipe sizes. If possible please will you tell me what size I should be looking for, so I can order a few? Thanks.
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Hi Neil
I have bought some dowty washers for the same purpose, but I've not tested them in anger yet! They are ID of 11.35mm, OD of 22mm (which is probably the measurement you want) and 1.6mm thick. I think they were cheaper than the fibre equivalents and I'm sure they will work a lot better! I can send you two if you can't get them? The place I bought mine from is just around the corner from where I work and I'm going back there this week to pick up my new oil pipes they are making up for me.
Cheers, Simon
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I have bought some dowty washers for the same purpose, but I've not tested them in anger yet! They are ID of 11.35mm, OD of 22mm (which is probably the measurement you want) and 1.6mm thick. I think they were cheaper than the fibre equivalents and I'm sure they will work a lot better! I can send you two if you can't get them? The place I bought mine from is just around the corner from where I work and I'm going back there this week to pick up my new oil pipes they are making up for me.
Thanks for the offer, Simon. I'll try to buy some first. Can anyone relate those dimensions to BSP sizes?
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Lots of Dowty washers on Ebay in BSP sizes.
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Lots of Dowty washers on Ebay in BSP sizes.
Julian, I know, I just need to know the size so I don't waste my money.
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Why? You've got plenty. *smile* *smile* *smile*
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Why? You've got plenty. *smile* *smile* *smile*
What, money? Oh yes, I'm rolling in it!
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1/4 BSP is around .525"
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1/4 BSP is around .525"
Thanks RD; that sounds about right for the rocker spindle diameter.
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Maybe I'm misinterpreting and giving an unneeded egg suck lesson, but the spindle doesn't need sealing it only centres the washer, just the outer of the banjo union circumference needs sealing
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GB.. Plain Fibre, Aluminium or Copper washers should easily seal the flat banjo against the rocker cover, provided the faces are undamaged. The tapered feed bolt can be lapped to the banjo, ensuring no abrasive enters the oil ways. Then a dab of Loctite on the taper if you have some handy should get you an oil tight joint.
Swarfy.
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I've heard that people use Dowty type washers on the rocker banjos with success. I would like to give them a try. DuTch, surely the banjo ID fits around the spindle OD so a washer that does the same should be the correct size. I would like to hear from someone who has done this and can tell me what size to buy.
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... DuTch, surely the banjo ID fits around the spindle OD so a washer that does the same should be the correct size. ......
Maybe you mean "the banjo ID fits *snug* around the spindle OD" ? If so, it may be close but I don't think mine does, but maybe also didn't come with my engine...been a while since I had it off but if I recall the wall thickness is *~about* 1/8"- if that...I can't find any dowty washers locally anyway, but as I've said before I made a couple of washers from nitrile sheet a couple of years ago and they seem to be functioning ok (cut a hole to fit the shaft snug to locate them) works for me, but I hope you find what you're looking for.
nb I remember someone (maybe BSA500 ?) looking into it a year or two ago but the size mentioned didn't relate to anything I could find at the time but 1/4" BSP sounds familiar
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Hi GB,
I have done this, and it worked great for me.
1/4 bsp bonded seal (dowty) washer is what you need.
But dont cheat yourself, get a small selection. These things work great on drain plugs too.
Lee
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Hi GB,
I have done this, and it worked great for me.
1/4 bsp bonded seal (dowty) washer is what you need.
But dont cheat yourself, get a small selection. These things work great on drain plugs too.
Lee
Thanks Lee.