Author Topic: C11 Problem  (Read 2676 times)

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Offline Owen

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Re: C11 Problem
« Reply #60 on: January 27, 2019, 06:26:44 pm »
Good progress. However as suggested I would have done a shoulder just to stop any worry of the Bush working into the flywheel.
« Last Edit: March 06, 2019, 08:09:51 pm by Owen »
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline stev60

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Re: C11 Problem
« Reply #61 on: January 28, 2019, 01:00:04 am »
What I will do is pot a couple of small tig welds on the crank side Ive left the bush slightly smaller so there is an ideal v to fusion weld without protruding into the crankcase.

Offline stev60

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Re: C11 Problem
« Reply #62 on: February 02, 2019, 02:18:07 am »
Changed new bush for stepped one on advice , and it is right, pressed in with loctite, drilled to fit pin, had to machine a few thou off pin for a good fit again with loctite. Housings fit perfectly together with slight tap on locating pins, so I must have managed to get that hole right  which is a big plus, just waiting on a few parts from England and it will be all back together.

Offline bangers-c10

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Re: C11 Problem
« Reply #63 on: February 02, 2019, 02:48:08 am »
wonderful news, give the oil feed to big end a clean out?

Offline stev60

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Re: C11 Problem
« Reply #64 on: February 02, 2019, 06:50:50 am »
In going trough everything, distributor float was out by  mile, , I suspect that that  I may have  the shorter rocker pin for the model but apart  from it being shorter in the outer case the circlip is in  the right place

Offline Owen

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Re: C11 Problem
« Reply #65 on: February 02, 2019, 09:52:25 am »
A job to be proud of.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline Paul S

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Re: C11 Problem
« Reply #66 on: February 02, 2019, 12:20:42 pm »
Should be good for another 70 years. :)
Growing old is compulsory, but growing up is optional.
1955 C12
1961 Greeves Scottish
1998 Kawasaki zzr600
1967 Triumph Vitesse 2 ltr convertible
1959 BSA C1000

Offline stev60

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Re: C11 Problem
« Reply #67 on: March 06, 2019, 06:05:11 am »
Took a while because of other issues and doing all the things that you can do when every thing are apart, back together  and no go, probably my fault when the timing gears were taken out just assumed that the marks would be right, way out , as can be seen from photo  they line up , but actually the inlet valve was opening when piston was at bottom of stroke, ive added photo and the part of gear with the  sort of notch cut out, that  is where it should line with the cam gear even then im not quite sure if im a tooth out but the piston is in the right position , and looks right, the notch gives the appearance of being done by hand and is only a few mls deep.mmmm

Offline timsdad

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Re: C11 Problem
« Reply #68 on: March 06, 2019, 07:08:29 am »
On ramped cams, the inlet valve should start to open as the piston goes over top dead centre and starts its induction stroke. The inlet valve sort of follows the piston down and starts to close at about the piston's half-way point so the valve is shut  as the compression stroke starts.

You can get a good idea what's what with the head off, push rods in and fingers pressed on the top of them.


I know it's a stupid question, Steve, but are you sure you were turning the crank the correct way? It sounds like the cam was going backwards.


Ray
Just a motorcyclist.

Offline Brillandy

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Re: C11 Problem
« Reply #69 on: March 06, 2019, 09:03:33 am »
I think the notch you are talking about is there to anchor the nut locking washer.  After tightening the nut and folding the washer up against a flat on the nut, the washer should be punched into the cut out to stop it turning.

Andy
56 C10L
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Offline Owen

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Re: C11 Problem
« Reply #70 on: March 06, 2019, 11:25:55 am »
I know this sounds daft but do you have a c10 camshaft in the C11?
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline chaterlea25

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Re: C11 Problem
« Reply #71 on: March 06, 2019, 06:10:05 pm »
Hi Steve,
The marks on your photo are correct
The notch has no relavence to the timing
The only other thing I can think of is a sheared key in either the cam or crank pinion, although the cam looks right in line with the timing Mark??
This could have happened when things went Bang
Do the marks line up when the piston is at top dead center, ? every two rotations of the crank

John



Offline stev60

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Re: C11 Problem
« Reply #72 on: March 06, 2019, 07:13:49 pm »
I actually had the bike ready to start ignition timing etc all checked. No go not, even a fart always been a first kick starter , first thing I thought of was valve timing. It is a C11 cam im sure. I know its not C10.The marks are about two teeth out on every second rotation at TDC, but the key is fine no damage anywhere, apart from a few scuffs on the rocker arms and pushrods are new. Will check valve movement again tonight. A lot of other issues are keeping me away from it. Didnt check marks when I took it out, cam came out with cover.

Offline chaterlea25

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Re: C11 Problem
« Reply #73 on: March 06, 2019, 08:02:30 pm »
Hi Steve,
As long as the marks line up with each other it should be right
They maybe slightly off when the piston is at tdc but thats ok
If you turn the engine over, the exhaust valve should be about to close and the inlet just after opening at the next TDC
The only other thing is did you put the points plate on 1/2 turn out?

John

Offline ianinglis

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Re: C11 Problem
« Reply #74 on: March 14, 2019, 06:55:35 pm »
on the C10L the points cam can be removed and re-fitted 180 degrees out - dont ask me how i know!!



ian
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