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Messages - cee-b

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It was holding 200ml. Not the driest of dry sumps!

Trying as a PDF

That seems to work. I haven't drained the sump since identifying the leak; I'll give it a go now

I dont think that little hole is the problem, excess oil in the sump will either pass the rings and burn giving a smoking exhaust or will be pushed out of the breather - photo is how BSA describe the breather

Thanks Julian, I had located the breather from your previous post. I'm afraid it was a red herring that I had introduced in error.

The oil is definitely coming from the small 'pin hole' drain near the bottom of the cover - I can watch it weeping out and dripping down the casing to the low point (sump bolt, RH rear).

It is only a small drip but, over time, it makes quite a big puddle.

I have taken a pic but it is too many KBs to be accepted as an attachment; I'll try and find some other way of posting it.

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 16 November, 2017, 12:17:27 »
Just a quick thought:

As the oil mist drain is currently creating more of a problem than it is solving; is there any reason not to temporarily block that drain hole until I can solve the wet sumping problem??

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 16 November, 2017, 12:14:02 »
OK, that makes sense - thanks.

The real problem, then, is wet sumping causing oil to come out of the oil mist (inward) drain.

The difference in how much oil comes out is most likely due to slight differences in the angle it is parked at and length of time it is left.

Thanks again Julian 

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 15 November, 2017, 22:08:32 »
The breather outlet is either a half moon cutout at rear of outer timing cover or a tube adjacent ro the external clutch lever, depanding on the year of your engine.

If oil is coming out of the outlet you may have  excess oil in the sump due to wet sumping and/or there is wear in bore and/or rings and or valve stems and/or valve guides.

Thanks for your response Julian; good information as always. I'll see if I can find the crankcase breather outlet in the locations you mentioned

I think you are almost certainly correct that it is excess oil in the sump. I'm now wondering what the small 'pin hole' through the gearbox inner cover is? That is where it is leaking from.

I'll take a pic tomorrow and post it on here.

Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 15 November, 2017, 21:58:50 »
I have a (relatively) oil tight engine, however occasionally the engine used to wet sump and dump the contents of the system over the floor when parked up.
As in general the engine did not leak I was loath to strip it, I saw that many AJS and Matchless bikes had a tap in the oil feed line from the tank, so I fitted a small tap (gas tap with 3/16" internal bore). When the bike is parked up for long periods I simply switch it off, - then remember to switch it on.

Thanks, but I am reluctant to put anything in the system that could lead to oil starvation. I only have to think of the number of times I've forgotten to turn fuel on or off to know that would not end well.

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.

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