1960 Dexta injector pop press. and not popping on the tracto

New here and to the Dexta, so please bear with me.

I purchased this Dexta a few weeks ago for $500.00. Not great shape but, I did take a battery and quickly bumped the engine over to see if it would turn over and not have a rusted piston or two. I saw it turn over just a few degrees and know it was OK, it still had A/freeze in it so I also knew the block was not cracked.
Got it home, drained the oils/water out of the transm. and diff. Way too much water in them but, I knew that from inspecting it before buying it. The diff. only had slight signs of rust and the only rust I could see in the transm. was the very top gear (PTO) drive gear maybe, it wasn't too bad. I then drained the eng. oil, pulled the screen, wiped out the oil pan, new filter and oil. Then I pulled the 3 injectors so as to be able to just crank the engine over and build up oil pressure before actually trying to start it.
Got oil pressure, I don't know how much because I could not find a port to tap into to install a gauge but, did leave the big nut loose on top of the oil filter housing that has the spring and ball in it. Oil started seeping out when cranking so I know it primed and had some pressure.

On to my problem, After changing fuel filter, (which was missing the spring and washer to actually hold the filter up against the top of the filter housing so it could actually filter the fuel, I believe I have that issue fixed ) I hooked the injectors to the fuel lines, left them loose to bleed the air out, cranked the engine over till all 3 were dripping fuel out at the injector connection, tightened the lines and proceded to crank it and watch the spray pattern. Well, only one had any pattern at all, the other two just seemed to dribble out.
I then pulled them off and used a pop tester, only one would pop off, at about 400 psi, the other two just leaked. I pulled apart all three, one at a time. 2 of the 3 were rusty but I won! Cleaned them all up. I managed to fine a pdf manual online but, in the section for injectors it did not give pop off pressure for the injectors. I set my three @ 1,400 psi, hooked them back up to the tractor fuel lines, bled them and only can get one to barely pop off while cranking. Now again, the injectors are out of the engine so, the engine is cranking over pretty fast. I bled and bled and still only one will barely spray yet, if you loosen the fuel lines @ the injector, they will squirt when cranking.
Did I set the pop pressure too high or do I have a Simms pump issue??? The injectors are also Simms injectors.

The spray pattern on all three after cleaning,had two spray holes on each injector which I thought was normal for the age and technology of the engine at the time.

Thank You! Kim Whitlock

Very common for simms pumps to have broken return springs inside. If the tractor has been setting a long period of time and you found the nozzles needed attention, then common sense would say the pump is in the same condition. The rack could be easily stuck likewise. Without looking it up I can only go from my short memory. The last set of Dexta nozzles I cleaned was set like 2650PsI if I remember right. I havent seen many old simms pumps that didnt need to be torn down, cleaned, and calibrated. Just kind of the nature of the beast. 50-55 years old, and most had poor maintenance at best. It is not real expensive to get this system cleaned/repaired to work like it should. If it is the mechanical governor it will cost a little more than a vacuum unit. Either way you should be able to get the pump and nozzles done for about 500 bucks. Call around and price shop. Always makes me laugh that a fella will go on the internet to ask questions on repairing,or to buy a tractor, but pick the pump shop closest to him. You can save lots of cash, if you look around. Some good guys out there who know how to get the job done without bending you over. Couple of calls may be good to you. Good luck,,, Al 231/757/0064

Al is correct.. Opening pressure is around 25-2600 psi.
You can remove the side cover on the pump to see if it has broken springs
and/or a stuck rack.. Good luck with your project..

Thank You both very much for the information!!
As mentioned, I will pull the side cover and have a look see and go from there.

I pulled the side cover off the pump, there were no broken springs on the plungers.
The rack moves freeley, it is pushed all the way towards the front of the engine by the governor spring. I would guess this full forward position would be full fuel? I say that because from what I read it's a vacuum governor and I would guess it would go to full throttle when it has no vacuum.

I read that you need a couple special tools to be able to pull out the delivery valves, had anybody ever been able to get out the barrel out with out a special tool? I would like to inspect all the barrels in the pump.

Thank You!
Kim

Nothingbutdarts,

The pop pressure for the vacuum governed Dextas is supposed to be around 2000-2100 psi.

Thank You!
I called around a little and have only found one place so far that can check or rebuild the injection pump.
$100.00 to pull apart and check and another $100.00 to put it back together.

$1000.00 to $1,200.00 to rebuild. WOW

Don't know what I'm going to do with it.