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Old 04-02-16, 03:15 PM   #1
Broadsman
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Default Alcon Pump Removal

Hi All, I'm new to the forum so excuse me if I'm posting in the wrong place?

I'm into classic motorcycles but recently purchased a Villiers Mk 12 with a 2" Alcon pump to play with. The engine starts & runs nicely. However the pump is in need of a rebuild.

The pump is held to the engine by four bolts which I have removed. I was expecting to just withdraw the pump from the engines keyed driveshaft but it's stuck fast. I have stripped out the innards of the pump & can see the impellor.

The pump casing is made of aluminium & there are signs of damage where previous owners have tried to lever the pump off. I don't wish to damage it further.

So my questions are:
1) Is there anything holding the pump onto the shaft that I have missed?
2) I 'suspect' that it's just the key holding the pump impellor on the shaft? If so any tips to withdrawing the pump without damaging the soft alloy casing?

Any thoughts, similar experiences, or suggestions most welcome,

Regards, Broadsman
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Old 04-02-16, 08:19 PM   #2
ListerHA2
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If the suction port is central can you see a nut holding the impeller on?
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Old 04-02-16, 09:41 PM   #3
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With the pump (inlet) cover off I can access the Impellor. It's an aluminium impellor with a smooth brass domed centre. The centre does have a small central pip - but no nut or obvious method of securing.

With the four nuts removed there is 'slight' movement of the pump casing on the impellor shaft. I think that's due to bearing wear. But absolutely no movement of the impellor on the engine shaft.

I have tried penetrating fluid & tapping with a nylon mallet but it's stuck fast.

I will try & upload some photos tomorrow.

Ta, Broadsman

Last edited by Broadsman; 04-02-16 at 10:02 PM.
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Old 04-02-16, 10:01 PM   #4
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Couple of photos....
http://www.stationary-engine.net/for...1&d=1454620879
You can see how the pump is bolted on in this photo.
http://www.stationary-engine.net/for...1&d=1454621009
Hope this helps, Ta Broadsman
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Old 04-02-16, 11:24 PM   #5
hammy
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Default Alcon pump

I think the impellor is threaded onto the shaft, can't remember if it's right or left hand thread though
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Old 04-02-16, 11:50 PM   #6
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Quote:
Originally Posted by hammy View Post
I think the impellor is threaded onto the shaft, can't remember if it's right or left hand thread though
Looking at the impeller vanes the thread is normal right hand so it should wind off anti-clockwise.
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Old 04-02-16, 11:55 PM   #7
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Looks similar to the Alcon/Jap2A I have and the impeller (bronze on mine) just unscrews. Might need a knock with something to start it off, standard right hand thread with a spring and gland seal behind it.

Pete.
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Old 05-02-16, 03:56 PM   #8
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Thanks for your help. I had not considered the impellor might have been screwed on.

I have had a brief go to unscrew it today but I can only hold the crankshaft on the generator end nut & that keeps coming loose. I will have another go at securing the crankshaft better but, as I work shifts shifts, that will have to wait until next week.

Will let you know how it goes.
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Old 05-02-16, 08:26 PM   #9
Gavin b
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Quote:
Originally Posted by Broadsman View Post
Thanks for your help. I had not considered the impellor might have been screwed on.

I have had a brief go to unscrew it today but I can only hold the crankshaft on the generator end nut & that keeps coming loose. I will have another go at securing the crankshaft better but, as I work shifts shifts, that will have to wait until next week.

Will let you know how it goes.
When I last took one to bits we turned a block,to fill the bore of the engine up then bolt the head back on with a small piece of rummer above n below the block of wood.
This will keep the crank still
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