The Fordson Tractor Pages Forum

Trying to find some fuel lines to test my diesel pump.
I have two lines from a friend. One of a 1000 series and one of a Dexta. One will fit, the other not. We both don't know which came from which tractor.
I ordered lines with a nut with M12 by 1.5 mm. They didn’t fit. Measured the thread on the pump connector and it's 12 mm in Dia and 1.25 mm pitch and sixty degrees.

Ordered a set of fuel lines for the Fordson New Major, they won't fit either.

The question has maybe been asked before, but could not find anything.

Who knows the right type and size of the thread.
Is it on both ends the same?

Thanks in advance

Both ends are the same because they use the same nut (E1ADDN-993178B in you case). I haven't found details on this but will measure ours tomorrow and see what I find. Good to see you back by the way.
Sandy

Thanks Sandy.

Been looking a bit further in to it, and my gues is that it is M12 x 1.25 mm.
Outer dia is 12 mm, angel is 60 degrees and pitch is 1.25. There's no other thread matching this data.

Just looked at our stuff, I'm measuring 15/32" diameter, possibly 14 TPI. Not sure if it is actually metric or not, I'll check more accurately later. There does seem to be a 15/32"-14 UNS. Seems odd but you never know, Mk2 drain plug EB-6730 is 3/4-24 UNS, so not impossible.
Sandy

Rechecked it with a thread gauge, it's between 16 and 18 TPI, so could be M12 x 1.5, although it's not really what you expect here. Looking for the world series part number, just to see if it was meant to be the same as a Major, but can't find it. The Dexta is the same, so will fit. Can't seem to find details for later models in 2700E either.
Sandy

By the way I assume you mean the injector pipes. The pipe into the pump from the filter is 1/2" UNF (nut B-9243A).
Sandy

Yes Sandy, the injector pipes.

Today I did some further research on the threads on the connectors of the Simms pump. Until now, I'd only been working on my spare pump. Today I also looked at the pump thtá on the Major. To my surprise , I found that the threads on the Major pump and the spare pump are different. They are two identical pumps, both with SPE4A70S casted on the cover. The spare pump has a stamped number: 39289B, and the one on the tractor has number 190338.
When measuring the threads, the outside diameter is the same for both, but the pitch differs slightly. The spare pump has a 1.25 mm pitch. The Major pump has somewhere between 16 and 18 threads per inch.

I also have a injector line with M12 x 1.5mm pitch. Will see tomorrow if that will fit on the Major one.

The delivery valve holders never changed (E1ADDN-993228, Simms P.81995) until the minimec. The nuts on both pumps should be E1ADDN-993178B (Simms P.81977), the thread never changed, these are the ones with 3/4 AF hex (the earliest E1ADDN-993178 was longer and had a seal inside and 18 mm long instead of 15 mm from then on, but those were already discontinued by June 52), the later E1ADDN-993178C (used from 1458430) are 5/8 AF but otherwise the same. The inlet adaptors in the injectors (E1ADDN-993197B, Simms P.85609 in later cases) did change early on from having a filter in them to plain, but the thread didn't. Your earlier pump is from early 54, 288 after the pre-filter was discontinued. The later one ties in with your tractor's age (can't remember your serial number, I'm sure it's on here somewhere but can't remember where!). The B suffix in the early serial number indicates it has camshaft E1ADDN-993201B (Simms P.84695) fitted from 1239515 to pump 52205 to prevent running backwards, At that time some camboxes were stamped with an A suffix meaning a straight swap was possible (but still had the early camshaft), early pumps not stamped require modification to fit the later camshafts. Metric threads are possible, the fuel gallery inlet adaptor (E1ADDN-993122, Simms P.82014) is inside 1/2" UNF but outside M19 x 1.5. We got a very cheap pump for testing, it's 195213, one of the last before Mk2 production, it's our oldest pump, and has the same thread as Ebro injectors from early 67. Are all four delivery valve holders on 39289B the same? I'm wondering if they're a different type used on other engines. Can only find one with no part number available, and only second hand. Remember your injector pipes should be the B suffix type, used from pump 52205 to 1425097. C suffix pipes will fit but won't look right, others won't fit.
Sandy

Thanks Sandy,

A detailed answer.
Today I fitted an injector line to the Major pump, for which the thread sizes were known.
The pump on the Major has for sure M12 x 1.5 threads.
How the backup pump has a different (UNC) version is a mystery to me.
The seller said the pump was in working order when it was removed from the tractor and put into storage.
That must have been sales talk. And it certainly didn't come off a Fordson.
For what I want to do with it now, it's sufficient. I can, if necessary, transfer the connectors from the pump on the Major to test the backup pump.

Thanks again.

Looks like you've got that sorted. Can you post a pic of the pump (39289B)? Just wondering what it looks like, I don't think they're UNC, UNS fits more suitably but could be metric too. Bare in mind this was a vertical one, and it has 45º helix plungers (E1ADDN-993153) rather than the later 50º ones (502E-993153, Simms P.85904). (Mk2 uses E1ADDN-993153B, Simms 85905;GV or GM on a Mk2 is 954E-993153B, Simms P.86204; minimec is 510E-993153B, Simms 512505-30) It also has the earlier excess fuel device. Performance will be a bit different, the governor spring is also different (unmarked rather than marked blue). As for the delivery valve holders try to find a part number on them, and other than that find some correct ones (rather than taking them off your original pump), if you've still got those pumps you used for parts years ago they should have enough to get a set of four. I would rather test a pump on a calibrating machine, then you avoid risking damage from overfuelling.
Sandy

Eureka.
Upon closer inspection of the threads, I discovered they had been distorted due to excessive tightening force.
The thread angle was still approximately 60°, but tilted.
I was too cautious to tighten the loaned and the new lines with anything more than hand force.
I've seen too many damaged threads, and for me, tightening them further is always a no-go.
I proceeded cautiously, and the nuts finally fit.

Thanks for all the help