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Messages - cee-b

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Singles / C15T crankcase breather oil leak - but only some times!
« on: 14 November, 2017, 19:38:17 »
I know that the subject of oil leaks has been covered countless times and apologise for raising it again. However, I can't find a previous answer for this particular set of circumstances.

When I leave the bike parked, it leaks oil from the RH side of the engine (nothing unusual about that, I know).

Removing the outer timing cover shows oil pooling and weeping out through the join; it actually drips from the rear RH stud of the sump, but this is only because it tracked to that low point.

The oil is entering that cover through the small breather hole low down in the gearbox inner cover - presumably this is the timed crankcase breather?

On some occasions this leak is barely more than a drip, on others however, it makes a fairly massive puddle. I can only surmise that the difference is due to whether the breather is timed open or not.

So, I have a two-part request.

1. Can anyone suggest a method of curing the leak?
2. If not, is there a method of determining whether the breather is open or closed without waiting for the puddle to form?

Any insights will be gratefully received.


The Star and Garter / Re: “Daylight MOT”
« on: 01 October, 2017, 17:49:25 »
Yes again

The Star and Garter / Re: “Daylight MOT”
« on: 07 September, 2017, 10:18:51 »
Yes, it can be a bit confusing but, a 'broad brush' summary is:

Either no lights must work (they can be fitted and either masked over or permanently disconnected), or all lights must work.

The clauses/exemptions relating to pre/post Apr 1986 only apply to bikes with lights fitted.

The reference to bulb horns seems pretty unequivocal; pre-August '73 it is legal.


The Star and Garter / Re: “Daylight MOT”
« on: 06 September, 2017, 18:50:37 »

You don't need a 'legal eagle' Robin, you just need the testers' manual.

Singles / Re: C15 primary drive oil level - question rephrased
« on: 20 August, 2017, 21:42:34 »
Thanks Mick and Julian,
I'll follow the advice and take the cover off to check what is going on from the inside

Singles / Re: C15 primary drive oil level - question rephrased
« on: 20 August, 2017, 20:32:32 »
You could remove the case to check that the level screw has a cutaway for the oil to issue.
Could be blocked or the wrong choice or screw or wrong outer case!

Thanks for your suggestions Mick.

I'm nor sure what you mean by the reference to a 'cut away' in the level screw. As I understand it, the screw merely acts to plug the drain hole - doesn't it?

I have explored the screw hole with a wire and it appears to 'blind'

If it is the wrong outer case, which is quite possible, it must still have a level plug somewhere. The question is, where?

Singles / C15 primary drive oil level - question rephrased
« on: 20 August, 2017, 13:38:25 »
To put it slightly differently than my first post about this, as there were no responses.

I have followed the directions from the Service Sheets regarding primary drive oil level.

If I remove screw M (the second screw back) which is identified as serving as the level plug, no oil comes out even if I overfill it.

If I remove the screw behind that, it drains pretty much the entire amount that I put in.

Other than draining the case and then putting in a measured amount (1/4 pint) every time, I am unable to check the level.

Can anyone advise please?

Singles / Re: C15 - another oil feed problem
« on: 20 August, 2017, 10:10:08 »
You  should be able to find the Rupert Ratio book on Ebay.
Thanks Mick, I'm keeping an eye out.

Singles / Re: C15 - another oil feed problem
« on: 18 August, 2017, 14:14:23 »
New pump and gasket fitted and the problem is solved  ;D I did it by the 'not preferred' method; it was tricky to reassemble but not too bad.

The bike now seems to fully functioning but with a bit of wet-sumping.

Thanks for the advice and assistance


Singles / Re: To polish, or not to polish - that is the question
« on: 09 August, 2017, 11:34:52 »
Yep, from the scratches it would seem that mine started off part-painted.

I have buffed out most of the scratches and got a reasonable finish with a high shine. I'll just let it dull down naturally and I think that'll do nicely.

Singles / To polish, or not to polish - that is the question
« on: 03 August, 2017, 18:07:36 »
In among the proper oily-bits problems I am trying to sort out, I have a slightly more 'fluffy' question.

The C15/B40 trials bike that I have just bought is mainly raw aluminium - fuel tank, oil tank, both mudguards, engine casings.

The finish at present is not so much 'brushed' as 'scratched to buggery'; it looks like paint may have been sanded off in the past.

The question is, what finish should I be trying to achieve?

I have got a polishing kit that is capable of finishing the items to a fairly good gloss shine, but is this what I should be trying to achieve on a '61 trials bike? What was the the original state of ali finish please?

Singles / Re: C15 - another oil feed problem
« on: 03 August, 2017, 14:04:22 »
Thanks Julian,
I'll wait until the Haynes manual arrives then give it a go.

At least I had 1 night of thinking it might be easy!

Singles / Re: C15 - another oil feed problem
« on: 03 August, 2017, 11:38:03 »
Here is the update. GLOOM!

I have gone in through the sump and it doesn't matter how much wiggling I do, that pump is not coming out through that gap; the pump body is considerably bigger than the aperture.

Is there a bigger pump that may have been fitted in the past?

Either way, it looks horribly like the only way to get it out is to split the engine - unless anyone else knows differently??

Singles / Re: First classic
« on: 03 August, 2017, 10:30:58 »
I am 6'2" and have just bought a trials bike - C15 engine (bored out to 290cc) in a B40 frame.

It is ideal size for me as a trials machine, but I wouldn't want to ride it any distance. I would say they are too small as a road bike for a tall guy.

Singles / Re: C15 - another oil feed problem
« on: 02 August, 2017, 16:34:52 »
I've just tried tracking down the Rupert manual - rocking horse sh1t springs to mind. It looks like being a Haynes; I'll also look for a parts book.

Thanks again for your help Julian - I'll update when I have some results.

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