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Messages - cee-b

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1
Singles / Re: C15T rear shocks - also chain slider?
« on: 02 January, 2018, 10:01:31 »
Try NJB Shocks website He made mine for my C15 He makes them from 280 mm approx 11ins. Excellent quality
Thanks for that, I'll give them a try.

2
Singles / Re: C15T rear shocks - also chain slider?
« on: 31 December, 2017, 16:45:07 »
Thanks again,
I'll see how it goes with the correct length shock first and then look at maybe adding a slipper if needed.

3
Singles / Re: C15T rear shocks - also chain slider?
« on: 30 December, 2017, 18:07:24 »
Thanks for that 'Thumper', I really should have given more detailed info about the bike.

It is 1961 and is actually a C15T engine in a B40 frame; apparently this was a favourite combination on the trials scene at the time. As both C15 and B40 are spec'd for the same rear shocks I didn't think it was significant - but I may well be wrong.

I hadn't appreciated that the extra length of the shocks currently fitted was the cause of the chain/pivot interference, but now you point it out it makes perfect sense. I'll replace with 11.9" and see if I get clearance.

I'm currently awaiting a reply from Bike Revival regarding what shocks they would recommend. I'm planning to ride the bike mainly at club days in forestry and some Long Distance Trials around Exmoor. I will be riding the LDTs for fun rather than competitively, but I'd still rather put something decent on it, not just the Emgo stuff you get on eBay.

Any recommendations would be appreciated.

4
Singles / Re: C15T rear shocks - also chain slider?
« on: 28 December, 2017, 21:04:49 »
Thanks for that Julian.

Unfortunately, I am now a little perplexed; that chart has me needing an 11.4" shock (same as a Bantam) but all the suppliers of classic bike bits spec an 11.9" for both C15 and B40.

At least I know that the 12.5" ones currently fitted are definitely wrong!

5
Singles / C15T rear shocks - also chain slider?
« on: 28 December, 2017, 16:29:56 »
My rear shocks are a bit pogo-ish so I'm after new ones.

The existing ones are 12'5", but all the info I can get (not much) points to the correct shock being 11.9". This is the length given for both the C15 and B40, but no mention mention is made of Trials. Is it the same for the T? Can anyone knowledgeable please confirm?

Also, the chain currently runs directly over/on the swing arm pivot and is wearing slight slots into it. Is this correct or should there be some manner of chain slider to protect the frame from wear?

6
Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 18 November, 2017, 21:11:03 »
Yes I think you're right Julian. The ball and spring could well do with looking at/renewing, but that is going to have to wait until next time I have the engine apart; I'm not going to go into it just for that.

7
Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 18 November, 2017, 16:57:19 »
The oil pump is a recently replaced recon item so I can't really get improvement there.

I have noticed that the level in the scavenge pipe (I have clear pipes) drops by around 5"over the course of a couple of days, so it is certainly leaking back through the scavenge side of the pump.

I'll put an NRV in the scavenge line to prevent that, but am not convinced that putting any restriction in the supply line is a great idea. I'll just buy Mrs B a replacement for the baking tray I've just nicked out of her range to park under the sump - problem solved (ish)  ::)

Thanks for all the help & advice guys.

8
Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 17 November, 2017, 17:25:51 »
It was holding 200ml. Not the driest of dry sumps!

9
Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 17 November, 2017, 17:05:21 »
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

10
Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 17 November, 2017, 16:47:02 »
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.

11
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??

12
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 

13
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.

14
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.

15
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.

 

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