Author Topic: 1951 c11 oil pump how hard is it to turn  (Read 420 times)

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Offline Johneebee

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1951 c11 oil pump how hard is it to turn
« on: February 20, 2019, 09:56:08 pm »
Hi all I am restoring a 1951 C11 in Canada and when reassembling the oil pump and priming it seems hard to turn as in you cant by hand but easy with pliers, I was careful when disassembling it to ensure the parts went back in there proper locations on reassembly, you can turn it by hand if there is no oil in it, thoughts on this? is it normal for some drag? I kept the original gasket, maybe a new gasket would give more space for gears to Turn?

Thanks, John

Online Biggles

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #1 on: February 20, 2019, 09:58:57 pm »
This has been asked before I am sure a quick search in the technical section will help or one of the moderators direct you to a link beyond me that sort of stuff
1954 C11g
1960 C15
1960 b40 ss90


Online chaterlea25

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #3 on: February 20, 2019, 10:49:12 pm »
Hi
Quote
I kept the original gasket, maybe a new gasket would give more space for gears to Turn?

There should not be a gasket within the pump to make a difference  ::)
Add a pair of 1/4  x20 nuts to the pump retaining bolts to simulate it being clamped in place once fitted
It can and will take many hours to get the pump running nice and "free"

You may have to do the move gears one tooth at a time in relation to their mate if you did not mark them on removal  >:(

John

Offline Johneebee

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #4 on: February 21, 2019, 04:55:05 pm »
ah I think you are right on this I will give it a try thanks

Offline ianinglis

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #5 on: February 21, 2019, 05:24:19 pm »
allthough the shaft is an odd shape it will fit in the chuck of a battery drill
hold the pump body firmly in one hand and spin the pump using the drill until its free
you may have to keep oiling it and cleaning it out (some use paraffin or diesel)

good luck you will get it to run free eventually


ian
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Online Tman

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #6 on: February 21, 2019, 07:10:32 pm »
In my experience of gear oil pumps it's usually only one of the four gears which is binding, so identify which one (by alternate removing and replacing) then remove the other three and spin the pump spindle with a drill after smearing the gear face with fine grinding paste cut with oil. Keep on checking how it's going, give it all a good clean and Bob's your uncle.

Offline Ginge

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #7 on: February 21, 2019, 11:17:51 pm »
If no fine grinding paste to hand I have had success with toothpaste.

A bright smile and good oil flow.
Ginge.

Offline Johneebee

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #8 on: February 22, 2019, 07:45:29 pm »
many thanks guys

Offline timsdad

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #9 on: February 23, 2019, 08:07:09 am »
After I've stripped, cleaned out, re-faced and re-assembled my pump, washed out all the grit etc and put it together the final time, I spin it in a bucket of paraffin, kerosene, burning oil or whatever you call it, John. The easiest way I've found to do this is to push a short length of plastic fuel pipe onto the drive stub of the pump with the other end in a cordless drill chuck. I stuff a short bit of threaded rod or a drill bit into the drill end of the pipe so I can grip it better, which also acts as a sort of clutch to slip if the pump gets tight.

I hold the pump under the paraffin in the bucket and the bit of fuel pipe gives the plot a bit of flexibility and makes it all easier to hold while spinning the thing at increasing speeds until it's nice and free. When it's done I just shake the excess kerosene off and repeat in a dish of engine oil because cleaning the pump out can put you back where you started.

Just one of the hard-earned lessons of a bygone age - life got a bit easier for me with my first cordless drill nearly thirty years ago!


Ray
Just a motorcyclist.

Offline MilitaryRon

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #10 on: February 23, 2019, 09:55:19 pm »
I've just got this M20 pump that was seized, freed up and turning, again, cordless drill helps. When I took the sump plate off, the bottom spout came away in the filter guaze. Strangely I came across another one like this a few weeks ago when visiting a friend in Reigate.  Both have been replaced with a NOS bottom plate from Russell Motors.  Ron

Offline cerullos1

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #11 on: February 24, 2019, 02:41:24 pm »
I live in Toronto and I have spare oil pump complete or parts Im in Etobicoke area if this helps

Offline Johneebee

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #12 on: February 24, 2019, 08:49:33 pm »
Thanks for the pump offer, I ran a very light oil through it while turning it with a drill, it came free and will turn by hand now, all is good I think, now I am working on the carb which is missing the float needle seat and attachments, Im going to post a different info request for the carb unless you have some carb spares? thanks, John

Offline cerullos1

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Re: 1951 c11 oil pump how hard is it to turn
« Reply #13 on: February 26, 2019, 12:23:18 am »
I have a carb Im willing to sell it new and rebuilt