1957 Dexta Fuel Pump issue

This forum is about the Fordson Dexta, Super Dexta and Petrol Dexta.
lesestoff
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Re: 1957 Dexta Fuel Pump issue

Post by lesestoff »

They to have alot of parts on their page, thanks for the link.

I did harvest some shims from the cams.

I found numbers engraved on the back of the pump. Not sure if that helps. I did not know to look at the inspection cover for number. My understanding hat been that there were two types, with gov. and minimec. I will look for that number. Meanwhile this is what i found on the back.

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The spare camshaft is not perfect, one cam has some pitting but only on one edge, there is plenty of polished surface left for the wheel to run on.
The "overhauled" pump had a camshaft that looked awefull, it was super rough as if someone had taken a grinder to the surfaces. Really rough and rust damaged.

Looking at the exploded view, I think if i get the seal kit, and two bearings i should really have what i need. I am curious to see what it will take to pull out the outer race out of the mounting flange, The mounting plate side was already removed when i got the old pump. I might still need to geet delivery valves and or injectors, but my first priority is repairing everything that requires pump removal. I fiugure injectors and d-valves can always be changed later, if necessary.

Billy26F5
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Re: 1957 Dexta Fuel Pump issue

Post by Billy26F5 »

Changing delivery valves requires calibration, so better do it now if you're changing plungers already. Those two numbers I gave you are for pneumatically governed pumps, there are also two minimecs, P4588 for Dexta's (9.2 cc) and early Super Dexta's (11 cc) under Ford part no 957E-993101D, and P4696 for NP Super Dexta's (12 cc) under Ford part no 960E-993101. I've observed many stamped numbers on injector pumps but apart from pump serial numbers I haven't yet found out whart they are. Would like the pump serial numbers (on the cambox ahead of the lift pump flange) too. The outer races will be very tight too.
Sandy
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lesestoff
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Re: 1957 Dexta Fuel Pump issue

Post by lesestoff »

Of course there is always the nuclear option wich is buying a truly refurbished pump. I was curious, so i found one in england.
https://www.ebay.de/itm/187805072087?_s ... R67CoOi0ZwOnce i have a price from someone for calibration i can tally up all the parts i would have to invest in with the calibration. Cant really factor in the work.. Might have to consider this option.

Does anyone know the outfit? They make a very positive impression. Sheaf Diesel Services UK. And the price is about a third of what i have seen elsewhere.

Billy26F5
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Re: 1957 Dexta Fuel Pump issue

Post by Billy26F5 »

Can't say, never used them, you could ask them to do yours if you decide to have it done. If you do you'll still want to check the spill timing.
Sandy
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lesestoff
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Re: 1957 Dexta Fuel Pump issue

Post by lesestoff »

I noticed that their number is one digit different than the one you posted. Probably a typo.
Whichever i decide i will let people know how it goes.
Thanks Guys

Billy26F5
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Re: 1957 Dexta Fuel Pump issue

Post by Billy26F5 »

I agree, I don't believe a 693 exists. Have you managed to find the numbers and governor spring identification?
Sandy
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lesestoff
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Re: 1957 Dexta Fuel Pump issue

Post by lesestoff »

I found the number.
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I decided to go with the new pump.
They gave me 100GBP off for sending in a second pump, plus i still have the 3 brand new pump elements, that i am sure i can sell for 30 each.
At that point if seems like the better option.

Billy26F5
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Re: 1957 Dexta Fuel Pump issue

Post by Billy26F5 »

Sounds good. Did you see the markings on the governor springs? If they're long gone the free length and load at 50 mm and 43 mm would identify them too. I think most Dexta's have the 593, but don't yet know if the difference with the 402 is the governor spring or something else.
Sandy
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lesestoff
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Re: 1957 Dexta Fuel Pump issue

Post by lesestoff »

I did not see any difference between them. I also did not see any markings. I did not inspect them super closely.
Not sure what you mean by free length.

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