mllud
Gold Member
- Joined
- Oct 4, 2019
- Messages
- 273
- Location
- Missourian
- Tractor
- Massey Ferguson / New Holland 3010/ Ford 3550 Backhoe


I have a 1962 203 backhoe that I just went through cleaning the injectors and fuel lines.
One injector had both holes on the injector nozzle plugged. the high pressure line on that injector was also plugged up.
In the process of taking the injectors apart I lost the position of the nut that adjusts the spring pressure for the needle valve. Is there a initial setting for setting the spring pressure. A starting point!
I know injectors are adjusted by pressure on a special set up for that job but I'm not equipped with that equipment.
I'm looking for a starting point.
History
I put a seal kit in the injector pump and the tractor was running fine accept for the miss due to the clogged injector. I cleaned and repaired all the fuel lines on the tractor. The return lines to the tank were also plugged with gunk. I believe that high sulfer fuel had been used for years. Tank was also cleaned.
Right now I have strong fuel coming out of all three lines up to the injectors. Perkins A3-152. I just need a starting point on adjusting those springs pressure.
I have rebuilt several Lucas cav pumps and it ran fine up to me chasing why it had a miss. I found that and cleaned it up. Today I couldn't get it started. I was getting some intermittent firing. I really suspect the injector spring pressure.
All help appreciated
Sorry about the long path to the point. Trying to fill the gaps.