Oliver 77 diesel

[Stanley996]

Hi, so I swapped the head on my injector pump angetting fuel to the top 3 ports but only cylinder 1 is firing. The one below 1 gets fuel but only when spinning fast it seems and the other 2 aren’t getting any fuel. Any help would be greatly appreciated.

 

[Tramway Guy]

The head is probably worn to the point that fuel is leaking between the barrel and plunger. And if one IS firing, it may be because the opening pressure on that nozzle is lower than the ones that are not working.

 

[Stanley996]

The head is probably worn to the point that fuel is leaking between the barrel and plunger. And if one IS firing, it may be because the opening pressure on that nozzle is lower than the ones that are not working.

Is there anyway to check this

 

[scootergmc]

You're using terms like "top three ports" for an injection pump of which the head has six outlets to six lines for six cylinders. The injectors are themselves another thing. Are you getting fuel from the pump through the lines to the injectors? You will not be able to test the injectors themselves without (probably needing) a slide hammer or puller to remove them from the head and access to an injector stand to check for pressure/pattern.

For what it's worth, we just junked a 77 or 88 diesel that had been sitting for decades. The injectors came out hard and the couple I tested did not test well at all. I'm not saying you're fighting a losing battle trying to piece it together, but you're probably fighting a losing battle. If I were in your shoes, I'd find a place to send that pump and injectors and have them all rebuilt to original specs. You're going to save time in the long run. But you'll have to ask yourself what time and money you're willing to put into a tractor which may or may not run once you have a fresh fuel system. Are you assuming the rest of the tractor is fine? Running/driving Oliver 77 diesels can be had for a couple grand if the cost analysis means anything to you. Now if it's a family heirloom, that's another story.

Hang on- going back to my first paragraph and reviewing your other threads (it would be easier if you just kept replying to your old thread instead of a new one), do you even have a Bosch PSB injection pump? Or is your tractor retrofitted with a Stanadyne/Roosa Master pump, which would make more sense since you keep using terms like top three ports/bottom port?

 

[Stanley996]

You're using terms like "top three ports" for an injection pump of which the head has six outlets to six lines for six cylinders. The injectors are themselves another thing. Are you getting fuel from the pump through the lines to the injectors? You will not be able to test the injectors themselves without (probably needing) a slide hammer or puller to remove them from the head and access to an injector stand to check for pressure/pattern.

For what it's worth, we just junked a 77 or 88 diesel that had been sitting for decades. The injectors came out hard and the couple I tested did not test well at all. I'm not saying you're fighting a losing battle trying to piece it together, but you're probably fighting a losing battle. If I were in your shoes, I'd find a place to send that pump and injectors and have them all rebuilt to original specs. You're going to save time in the long run. But you'll have to ask yourself what time and money you're willing to put into a tractor which may or may not run once you have a fresh fuel system. Are you assuming the rest of the tractor is fine? Running/driving Oliver 77 diesels can be had for a couple grand if the cost analysis means anything to you. Now if it's a family heirloom, that's another story.

Hang on- going back to my first paragraph and reviewing your other threads (it would be easier if you just kept replying to your old thread instead of a new one), do you even have a Bosch PSB injection pump? Or is your tractor retrofitted with a Stanadyne/Roosa Master pump, which would make more sense since you keep using terms like top three ports/bottom port?

It’s a Bosch psb 6a pump. I believe the hydraulic head I put on it is worn since the other lines that get fuel aren’t getting pressure. I swapped the old head for this one. It’s kinda family heirloom. It was sold from my grandfathers dealership.