Oil Filter

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beesaoldman
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Oil Filter

Post by beesaoldman » Fri Jan 04, 2013 12:22 pm

My B25SS is fitted with the original British filters oil filter. I have tried two different replacement filter cartridges and both seem to be too short. That is they are free to move up and down inside the filter bowl when it is tightened up. The rubber seals at the ends of the filter do not seat on anything. The result will be that the oil will end up bypassing the filter, or at least some of it will. I have checked my parts book and nothing seems to be missing. The new filters came from different sources many years apart. The latest from Brit Bits in Christchurch a few months ago. The top of the filter should seal against the large washer retained with a circlip, but there is nothing equivalent in the bottom of the filter bowl for the bottom seal on the filter to compress against. Is there something missing from here. Any advice would be greatly appreciated, as the final stages of this 30 year rebuild are almost complete.

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Re: Oil Filter

Post by minetymenace » Fri Jan 04, 2013 12:41 pm

I thought there should be a spring in there (trapesium shaped), but my memory might be shot.

(moved you post to Tech)

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Re: Oil Filter

Post by ajsbsa » Fri Jan 04, 2013 7:22 pm

Hope this helps. Please see atatched a picture of the oild filter housing off my bike... as far as I am aware the components are complete - less the filter element of course.
IMG_2711a.JPG

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Re: Oil Filter

Post by beesaoldman » Fri Jan 04, 2013 10:26 pm

Many thanks for the photograph, a picture paints a thousand words as they say. I can clearly see that I am missing the conical spring and the large plates, washers, that the filter sits on in the bottom of the bowl. Now I know what should be there I will contact British Filters and see if they can supply them If not, have a look through my odds and ends that I keep in case they come in useful for something one day, boxes in the garage. It is odd that they are not shown in the parts book, but I expect that they would normally form part of a complete filter unit, and would not need replacing as individual items. Thank you once again. beesaoldman

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Re: Oil Filter

Post by minetymenace » Sat Jan 05, 2013 12:43 am

ajsbsa,great piccy, would you measure the spring and the washers please? :thumb

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Re: Oil Filter

Post by ajsbsa » Sun Jan 06, 2013 5:06 pm

I will do when I get a chance to turn it out... but thats unlikely to be until next weekend.
Kind regards
John

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Re: Oil Filter

Post by beesaoldman » Mon Jan 07, 2013 11:11 pm

I have found what I believe to be the missing spring, at least it looks like the one in the photograph. cone shaped 6 coils, 7/8" long, 5/8" dia at the bottom and 7/16" dia at the top. No sign of the missing plates/ large washers though, so will await your dimensions when you have the the time to measure them etc. Thanks once again. beesaoldman

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Re: Oil Filter

Post by ajsbsa » Sun Jan 20, 2013 2:28 pm

As promised (apologies it took longer than promised) please see attached another more detailed photo of the spring and washers with a tape measure alongside for dimensions.
The spring you describe in your previous post sounds right. I hadn't looked closely at the washers and they are not just plain washers. One (top left in the picture) is a plain washer apart from a raised register to the centre of the washer that acts to correctly position the wide end of the spring. Clearly the filter is desgined for the narrow end of the spring cone to be at the bottom followed by the washer with the register. The other two washers are the same (shown from both sides) and are backed with rubber to create the seal for the filter against the washer at the bottom and the plate attached the underside of the top of the filter. They have quite deep registers on the opposite side to the rubber backing to retain the filter in the correct position.
Hope that makes sense and helps.
Kind regards,
John
IMG_2855b.jpg
Internal washers from OIF filter

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Re: Oil Filter

Post by minetymenace » Sun Jan 20, 2013 2:51 pm

:ok

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Re: Oil Filter

Post by beesaoldman » Sun Jan 20, 2013 4:31 pm

Thanks for the additional information John. I think that the 2 large washers are the ends from the actual filter. At least the replacement filters I have have the rubber seals on each end to seal against the upper filter housing and the large lower washer. Being unable to locate a washer with the raised central area I have used a large flat washer with a rubber 'o' ring abound the bolt to seal it to prevent oil by pass and to make sure that all the oil flow is through the filter. Without this I could see unfiltered oil passing up into the filter between the lower washer and the bolt that holds the filter bowl in place.
Regards
David

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Re: Oil Filter

Post by minetymenace » Mon Jan 21, 2013 1:32 am

Just from addled memory, I have in the back of my mind that the cupped washers were from the old style filters, new ones may not reqire them, but may be wrong. I thought there as an O-ring or something onthe bottom plate to stop the bypass.

The design of this thing might alow for a bypass if the filter gets blocked (spring gets compressed, seal breaks, oil flows), but the pipes are the wrong way round, what's that about? Is there a flow indicator on the top of the case?

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Re: Oil Filter

Post by steve m » Mon Jan 21, 2013 2:34 am

are these the standard filters we are talking about? if so, clicking on the red "data base" button at the top of the page and looking at the B25 picture and the T25 picture it seems they are different - surely not. but anyway the exploded view in the T25 listing is a good one.
hope this helps.

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Re: Oil Filter

Post by BSA_WM20 » Mon Jan 21, 2013 8:43 am

From memory there were two different units fitted.
One was a British Filters Unit as fitted to the WD B40's and shown in this thread which has a washabke wire cartrigde
The other was a Vokes which is similar but has a disposable paper element which I think is no longer available.

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Re: Oil Filter

Post by kommando » Mon Jan 21, 2013 8:57 am

The Vokes went on the B40WD, the British Filters unit went on the B25.

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Re: Oil Filter

Post by minetymenace » Mon Jan 21, 2013 10:27 am

Paper elements are available from farmyard machinary suppliers.....must be used on some ancient tractor...

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Re: Oil Filter

Post by Bill » Mon Jan 21, 2013 11:50 pm

minetymenace wrote:Paper elements are available from farmyard machinary suppliers.....must be used on some ancient tractor...
Yup.
Many years ago I just took my old B25 filter down to the local car accessory shop and asked them if they had one like it. When I told them it was from a bsa motorbike the manager there, a biker himself took it as a challenge and went for a rummage through all the loose filters like it and turned one up.

It’s been years now and I can’t be sure but I think it was the same as a Citroen 2CV.

bill

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Re: Oil Filter

Post by minetymenace » Mon Jan 21, 2013 11:58 pm

Pretty sure a 2cv has a regular spin on filter, I think it has a remote mounting making it a suitable after market accessary.....

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Re: Oil Filter

Post by Richard Hunt » Tue Jan 22, 2013 12:15 am

Minety + 1.

Previous owners of both my B44SS and Triumph T120R fitted the same after market filter kits in the return lines. They use spin on 2CV oil filters

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Re: Oil Filter

Post by Mark Cook » Tue Jan 22, 2013 12:27 am

2cv and norton are the same fitment

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Re: Oil Filter

Post by Bill » Tue Jan 22, 2013 1:24 am

Oh well not 2CV then, unless the ancient models had them before the spin on types.

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Re: Oil Filter

Post by BSA_WM20 » Tue Jan 22, 2013 11:40 am

kommando wrote:The Vokes went on the B40WD, the British Filters unit went on the B25.
Opps.
Backwards again Trev.
Sorry fokes
Thanks Kommando.
Last edited by minetymenace on Tue Jan 22, 2013 1:11 pm, edited 1 time in total.
Reason: Unticked "Disable BBCode" to make quotes work.

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Re: Oil Filter

Post by ghislain » Wed Jan 23, 2013 12:12 pm

if I ride BSA unit singles , I drive Citroen 2cv cars too ... (nobody's perfect :thumb )
And I'm pretty sure that before the big cartridge filter , there was nothing on these engines but gauze ....
IF it was used elsewhere , it would be as Minety says , agricultural use ....

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Re: Oil Filter

Post by Bill » Sat Jan 26, 2013 4:13 am

ghislain wrote:if I ride BSA unit singles , I drive Citroen 2cv cars too ... (nobody's perfect :thumb )
And I'm pretty sure that before the big cartridge filter , there was nothing on these engines but gauze ....
IF it was used elsewhere , it would be as Minety says , agricultural use ....
Yeah the memory has failed me there, but i did get a filter from the local auto shop and they dont do tractors.

Anyway i have the spin on type now so now it has a 2cv filter after all.

no worries

bill

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