Author Topic: C10 engine mainshaft (Drive side)  (Read 375 times)

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Offline $sidevalve

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C10 engine mainshaft (Drive side)
« on: November 23, 2014, 11:18:52 AM »
Hi does anyone know if the C10 drive side mainshaft is the same as a C11 or C12? My C10 drive side is about 10 " long and has obviously been connected to a car-type starter motor.

If not, can someone inform me of the total length of a standard C10 drive side shaft (I may have a lot of grinding to do!)
Also, if the shafts are pressed into the flywheels - how many tons will I need to press the shaft out?
Thanks all.
Sidevalve

Online Owen

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Re: C10 engine mainshaft (Drive side)
« Reply #1 on: November 23, 2014, 11:42:30 AM »
The C10 and C11 main shafts are the part No. 29-2633
The C10L, C11G & C12ohv main shafts are part no. 29-1988

They are a press fit. however they can be knocked out using a hammer and drift (with care). Putting it back in is easy, just heat the flywheel and put the shaft in the freezer prior to putting together.

What is the engine No.? and what model Pre 54 C10 or post C10L?
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline $sidevalve

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Re: C10 engine mainshaft (Drive side)
« Reply #2 on: November 23, 2014, 02:51:23 PM »
Hi Owen,
Thanks for your reply. Any information is welcome when one is in the dark.
The engine number is : ZAC10 1386
Cheers
Sidevalve

Online Owen

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Re: C10 engine mainshaft (Drive side)
« Reply #3 on: November 23, 2014, 03:31:12 PM »
If my memory serves well I believe you have an agricultural engine. A few years ago I bought one as well. Is there a hole/breather drilled/fitted in the dynamo mounting curve mounts? If your lucky you still have the side port drilled for the Engine breather.
Apart from the output shaft the engine internals are the same.

Where are you located I might have an old output shaft?
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline $sidevalve

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Re: C10 engine mainshaft (Drive side)
« Reply #4 on: November 23, 2014, 04:00:59 PM »
Hi Owen,
Thanks for the reply.
I have a C12 but the C10 engine was bought at an autojumble about 15 years ago. As it has been heavily precipitating every time I have had a few hours off work recently, I thought I would dig out the said engine and strip it down.
Yes, it does have the breather in the curved dynamo area. I intend to machine up a threaded blanking off piece and fit a dynamo. Did the bike engine have a crankcase breather and where was it situated?
I am situated in Herts not far from St Albans.
I can always find some pennies if you could post the shaft.
Best Wishes
Sidevalve
Attach Pic of my C12 (ex police bike but I could find no trace of black on any of the parts)

Online Owen

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Re: C10 engine mainshaft (Drive side)
« Reply #5 on: November 23, 2014, 06:19:54 PM »
Hi Sidevalve,
Nice C12.
It will take me a few days of digging to locate the drive side shaft.
You might find they have machined of the nipple for the breather on the LHS of the engine.

Here is where the 49 -53 models had their breather (round hole on LHS of engine)
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline $sidevalve

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Re: C10 engine mainshaft (Drive side)
« Reply #6 on: November 23, 2014, 06:50:38 PM »
Hi Owen,
Many thanks for the pic, (very useful) also looking for that elusive drive shaft.
A friend of mine has a C11 rigid. I would quite like one like it but with the C10 engine.
Maybe in a few weeks time, a rolling chassis will crop up! I will have time to do the work because l have 3 icy months wrapped up in the workshop, before riding on 2 wheels will commence for me.
I hope you liked my pic of the C12!
Cheers
Sidevalve

Online Owen

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Re: C10 engine mainshaft (Drive side)
« Reply #7 on: November 24, 2014, 12:13:34 PM »
I have a 49 -53, 3 speed plunger frame if you are interested? (No frame no. and no documents) Going cheep
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline jubclip

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Re: C10 engine mainshaft (Drive side)
« Reply #8 on: November 25, 2014, 11:58:11 AM »
Here are two pictures which may help.  The sizes are as follows from my C10.
Drive side; length of  plain section 39.5mm (1 9/16”), spline  49mm (1 15/16”), threaded 9mm  (3/8”).  O/a length is 4 1/4”.   My conversion from metric rule to imperial should add p to the same.  My imperial rule started in 20ths. hence metric measure first.   
On the tappet side the o/a length of shaft to end of woodruff is 52.5mm (2 1/16”).

If you need anything else ...do ask.  Shortly it will be rebuilt!  That’s the intention.

Best wishes. 
!945, C10 Rigid, 250cc Side valve.

Offline $sidevalve

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Re: C10 engine mainshaft (Drive side)
« Reply #9 on: November 25, 2014, 08:20:15 PM »
Hi,Owen.
Thanks for the frame offer. I am very interested. Please can you e-mail me on edbroadbridge@hotmail.com.
Thanks
Also to Jubclip for the very useful measurements that I have written in my notebook for reference (possibly at my next autojumble)
Cheers all
Sidevalve

Offline $sidevalve

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Re: C10 engine mainshaft (Drive side)
« Reply #10 on: November 28, 2014, 04:31:45 PM »
Hi Owen,
'Just touching base.' I replied to your email. Hope you are o.k.
Did my reply go in your automated junk mail? That sometimes happen to me, and I think "Funny that someone did not reply."
Sidevalve