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Posted by mark on September 22, 2006, 8:24 am
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Jon Evans wrote:
> Hi,
>
> I've purchased a vintage Medcalf Bros. Hy-Flo pump off eBay and I plan
> to strip it down completely and overhaul it.
>
> I've extracted the two pistons, they are about 12mm diameter and not
> 'butted' - it's a 12mm wide piston all the way. The bottom of the
> piston seems to be soldered over although it is solid at the top where
> the hole for the crank is drilled through. I'll probably have a go at
> removing / replacing the solder with a blowtorch.
>
> There's a 3mm hole in the side of the piston for an oilway which seems
> to connect up to the crank bearing hole. Inside I can feel with a thin
> screwdriver that the piston wall at the side is maybe only 1.5mm thick.
> It's full of cack which seems to be blocking it up.
>
> My question is, do you think this cack is just old hardened oil, or
> would it originally have been something which maybe helps the oil to
> whick up between the cylinder and the crank? If the latter, I'll have
> to replace it with something after I've cleaned it.
>
> Also any tips on solvents or techniques to use to strip hard baked on
> oil would be appreciated.
>
> It's a beautifully made old thing and I'm looking forward to getting it
> looking and running good again.
>
> Jon
Nitromors paint stripper works well on all that burnt on crap
Even does a decoke without the nead for wire brushes.
Just a toothbrush used here.
http://img.photobucket.com/albums/v190/aboard_epsilon/rover%20420/carbonoose.jpg
http://img.photobucket.com/albums/v190/aboard_epsilon/rover%20420/combucham.jpg
all the best..mark
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>
> I've purchased a vintage Medcalf Bros. Hy-Flo pump off eBay and I plan
> to strip it down completely and overhaul it.
>
> I've extracted the two pistons, they are about 12mm diameter and not
> 'butted' - it's a 12mm wide piston all the way. The bottom of the
> piston seems to be soldered over although it is solid at the top where
> the hole for the crank is drilled through. I'll probably have a go at
> removing / replacing the solder with a blowtorch.
>
> There's a 3mm hole in the side of the piston for an oilway which seems
> to connect up to the crank bearing hole. Inside I can feel with a thin
> screwdriver that the piston wall at the side is maybe only 1.5mm thick.
> It's full of cack which seems to be blocking it up.
>
> My question is, do you think this cack is just old hardened oil, or
> would it originally have been something which maybe helps the oil to
> whick up between the cylinder and the crank? If the latter, I'll have
> to replace it with something after I've cleaned it.
>
> Also any tips on solvents or techniques to use to strip hard baked on
> oil would be appreciated.
>
> It's a beautifully made old thing and I'm looking forward to getting it
> looking and running good again.
>
> Jon