[Healeys] Fuel pumps (AGAIN!)

Kees Oudesluijs coudesluijs at chello.nl
Wed Dec 5 06:46:20 MST 2018


I know some prefer to turn back the diaphragm a bit further but I rather 
stick to the manufacturers instructions. It does not do any harm though, 
you just increase the stroke of the diaphragm very slightly. Anyway it 
is not always very clear when the points stop throwing over so it is 
easy to be wrong by one hole.

Also in practical terms I have fun. I quite like to rebuild the 
SU-pumps. It is always nice to get a dirty clapped out pump with cracked 
tops and pedestals, rusted valves, dried out seals, cauliflowers on the 
points etc. going like a dream after an hours work. Sometimes I have to 
concede defeat when the screws are rusted solid and snap in the 
aluminium of the pump body  or when the coil has burned out but those 
occurrences are very rare.

Kees Oudesluijs

Op 5-12-2018 om 11:44 schreef simon.lachlan at alexarevel.plus.com:
> Yes and I think some of the experts have suggested turning back one 
> extra hole.
> These pumps certainly give us hours of theoretical fun(?) if not 
> always so much in practical terms. Having said that, I – touch wood – 
> have never had any trouble with them that didn’t arise from negligence 
> ie back in the days when I didn’t know what points were, let alone how 
> and when to adjust them.
> Simon
> *From:*Healeys <healeys-bounces at autox.team.net> *On Behalf Of *Kees 
> Oudesluijs
> *Sent:* 05 December 2018 09:55
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Fuel pumps (AGAIN!)
> Bob,
> The settings are the same for all SU pumps as the coil housing with 
> points assembly is mechanically the same on all SU-pumps.
> top blade to pedestal at the very front of the blade: 0,9mm/0,035
> coil body to lip on lower points assembly: 2,3mm/0,090", this used to 
> be 1,9mm in the early days with a slightly different points design 
> (NLA), but I set them all to 2,3mm using the later points
> Also important is the adjustment of the diaphragm:
> Remove the 10 guiding brass rings, five 8-shaped plastic parts or a 
> U-shaped plastic casting between the steel centre of the diaphragm and 
> coil housing.Screw in the diaphragm slowly while continually moving it 
> in and out firmly, holding the pump horizontal, until the points just 
> do not throw over any more, turn the diaphragm back to line up with 
> the nearest hole and then turn back another 4 holes. Refit the guiding 
> brass rings/8-shaped plastic parts/ U-shaped plastic casting. Be 
> careful that these are seated properly. If not they will get damaged 
> and the diaphragm will be destroyed when fitting the pump body and 
> coil housing together.
> Adjust the points as previously described.
> Fit a transil between the small terminal screw of the points blade and 
> one of the 2 larger pedestal screws.
> Kees Oudesluijs
> Op 5-12-2018 om 04:55 schreef Bob Spidell:
>     David,
>     Are the factory settings per SU the same as those in the shop
>     manual (Bentley, in my case)?
>     Bob
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