One point I omitted to mention is that when you fit new points, you have
to clean them first with a solvent and preferably polish them up with
flower paper.
New points usually have some preservative coating. When they have been
stored over a long period they may have corroded slightly.
Kees Oudesluijs
Op 22-11-2016 om 13:41 schreef Oudesluys:
> Simon,
> Nearly all SU pumps are fitted with a capacitor, which makes the pump
> dual polarity. So sparking is reduced anyway. Only early SU pumps did
> not have a capacitor or diode.
> Fitting a diode of course will make the pump single polarity which can
> be reversed by reversing the diode. I believe the diode works better
> than the capacitor, however all the pumps I have overhauled had a
> capacitor which I left in place.
> It is not always the sparking that destroys the points, damp
> conditions cause electrolytic corrosion forming forming complete
> "cauliflowers".
> If you still have single points replace them with a set of double points.
> Kees Oudesluijs
>
>
> Op 22-11-2016 om 13:28 schreef Simon Lachlan:
>> Kees,
>> Hi....surely VERY useful to fit a diode? In my own, purely personal,
>> opinion
>> I'd regard it as an essential step.
>> Once the thing's apart, it must be a shame not to fit one?? After
>> points are
>> set correctly, sparking is the thing that gets them in the end??
>> Anything to
>> slow down the process....
>> Simon
>>
>> -----Original Message-----
>> From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of
>> Oudesluys
>> Sent: 22 November 2016 11:01
>> To: healeys@autox.team.net
>> Subject: Re: [Healeys] su pumps again
>>
>> Op 22-11-2016 om 0:19 schreef Bob Spidell:
>>> 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
>> I think it is more a question of regular maintainance, but new points
>> may be
>> substandard like distributor contact points. Although I have not
>> fitted new
>> points yet, I do have some NOS original SU items, not the replica
>> ones which
>> may or may not be OK. Whenever I can lay my hands on NOS original
>> items I
>> get them, directly needed or not.
>>
>> Regular maintainance and repairing parts apparently is not a US thing,
>> however here in Europe, and certainly the UK, we are quite used to it
>> so we
>> may clean the points now and then, which helps to keep them alive and
>> prevent serious spark erosion.
>>
>> Once you have to tap the pump to get it going again for the first
>> time you
>> have to take action asap.
>>
>> The classic SU fuel pump with points is one of the most durable pumps in
>> existence if properly maintained and always repairable, no modern
>> fuel pump
>> comes near.
>>
>> It may be useful to fit a diode to reduce sparking.
>>
>> Kees Oudesluijs
>>
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>
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