Author Topic: No oil return on my c1qg  (Read 202 times)

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Offline Denmorered

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No oil return on my c1qg
« on: August 01, 2020, 05:13:39 pm »
Hi all and hope I can get some advise
I have a 1954 C11g where I don’t seem to be getting any oil returning into the tank. I have taken the tank off and checked it is all clear, take both pipes off and they are clear and removed the base cover and tried lifting the ball valve off its seat. Filled with fresh oil and still no sign of any return - any others had similar experience?
Many thanks for any suggestions

Offline rogerinfrance

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Re: No oil return on my c1qg
« Reply #1 on: August 01, 2020, 05:21:32 pm »
Now for a silly, remove the base plate, start engine, does any oil run out, and I bet it does not. I bet the oil pump has seized and the quill shaft has been stripped.

Online camman3

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Re: No oil return on my c1qg
« Reply #2 on: August 01, 2020, 06:56:26 pm »
Or worse, the gear on camshaft is damaged...or even more worse, both :'(
This has been covered many times before and is a common problem...but basically if any BSA has been stood for a long time, the mazak bodied pump swells and seizes.
Don't even kick it over when you first get it, but, drop the sump plate and oil pump out....very quick and easy, and check pump rotates by hand ok, if not you will need to free it up as described in many previous posts.
And as said, you will probably have to replace the drive shaft with the spiral gear.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline Denmorered

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Re: No oil return on my c1qg
« Reply #3 on: August 01, 2020, 08:00:26 pm »
cover off, moving freely, 4 bolts visible,
2 slightly larger and raised (see photo) - which ones need to come off to get the pump out?

Online camman3

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Re: No oil return on my c1qg
« Reply #4 on: August 01, 2020, 09:03:20 pm »
I'm fairly certain the two larger bolts hold the pump in.
Have a read through this old thread before you pull apart
https://bsac10c11c12.co.uk/smf/technical-tips/oil-pump-spruce-up/
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Online Owen

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Re: No oil return on my c1qg
« Reply #5 on: August 01, 2020, 09:13:09 pm »
 When you took off the cover was there much oil in the sump? If yes the pump was probably supplying oil to the engine. If not then as said before probably the drive shaft and stiff/seized pump.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline Denmorered

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Re: No oil return on my c1qg
« Reply #6 on: August 02, 2020, 09:06:34 pm »
That’s the pump off (even found some of my fathers whitworth spanner’s to do the job!) The top portion of the cogs turn freely but the lower two are really, really stiff (but do turn)
Thanks for the replies by the way - very much appreciated
« Last Edit: August 03, 2020, 10:47:34 am by Pete »

Online Owen

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Re: No oil return on my c1qg
« Reply #7 on: August 02, 2020, 10:25:18 pm »
Drop the pump drive shaft out and see what the drive shaft teeth look like? Plenty of info on here to get the pump working again.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online MilitaryRon

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Re: No oil return on my c1qg
« Reply #8 on: August 03, 2020, 06:35:28 pm »
I agree with Owen. If the pump wasn't turning when the engine was running, I'd hazard that the spiral gear has been stripped. Ron