Hmmmm ... Wonder why so many of us over here in the 'States have
problems with them? I think possibly the points manufactured in, say,
the last 30 years or so were substandard (I know those of recent
manufacture ARE substandard, confirmed by a respected rebuilder). Maybe
that's why your 'survivors' all had original points?
Bob
On 11/21/2016 12:47 PM, Oudesluys wrote:
> Today I overhauled my 42 year old SU fuel pump. Apart from an
> occasional cleaning of the points with a rough bit of card board
> nothing had been done to it in all those years and appr. 180.000 miles
> in various cars. The pump itself had never been opened.
>
> When I took every thing apart it was amazingly clean, no sediment,
> grime, corrosion. And that after using lead free petrol with ethanol
> 5% for most of these years.
>
> Have a look at the pictures.
>
> The job is surprisingly easy. There are several YouTube films showing
> how it can be done, although they do over simplify. You need to clean
> the points with 400grade wet&dry, then polish them with 2000 grade
> flower paper. If they are to far gone you can renew this assembly.
> Available at any SU supplier in the UK or through ebay. After
> cleaning/replacing the disassembled points assembly you have to set
> two gaps using feeler gauges at assembly: 0,035"/0,9mm for the points
> blade over the flat surface of the Bakelite bridge and the lower edge
> of the spring blade with points and 0,070" or 0,090"/ 1,9mm or 2,3mm
> (depending on the source, I use 2,3mm) between the upper surface of
> the cast iron body and the small sideways brass strip of the lower
> point assembly.
>
> If all is clean, leave the valves and other parts alone, just remove
> the diaphragm and check it. It is nearly always OK.
>
> Lately I did about 11 SU pumps. All at least 40+ years old. Only two
> were very dirty and/or corroded internally, one had some slight
> yellowish sediment in it, only one diaphragm had to be replaced, only
> one set of valves and seals had to be replaced, all points assemblies
> were serviceable, one bridge was cracked but could be repaired using
> Araldite, the same with one of the Bakelite top covers.
>
> Kees Oudesluijs
>
>
>
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