900 Case diesel tractor

[jrobison]

I have a Case 900 tractor, barn find. It was last used in the late 80’s, early 90’s. It was running when my father in law parked it in his barn. He recently gave it to me to restore. I replaced all of the fuel filters, repaired a small leak in the tank, and wound up replacing the injector pump as two of the injector pistons were froze up. It started but ran poorly missing and popping no power. I pulled the injectors and cleaned the lines, and pre-combustion chambers. The injectors were in poor shape, three were good one was faulty and two were completely fouled. With new injectors I started over from scratch and completely bled the entire diesel system. To date I have rebled the system 4 times yet the tractor will not start. It will fire on ether or diesel but will not run on diesel for more than a few seconds. I am totally out of ideas as to what else I can do. Also the timing of the injector pump has been checked twice since the new injectors have been installed. Any suggestions would be appreciated.

 

[Tgrasher]

Air, is the air intake clear of debris?

 

[used red MN]

I don’t know the exact ins and outs of timing that pump. If you are doing it per a manual you should have it right. Just like a distributor in a gas engine has to spark on the compression stroke the injector needs the pulse of fuel fed to it in the same manner and in time with the compression stroke. Are we sure this is happening? The engine crankshaft timing mark can also show TDC of the exhaust stroke, it has to be on TDC of compression. I would pull number one injector and undo the lines holders and reconnect the number 1 injector to spray in open air. Then crank the engine and see if the injector squirts fuel in sync with the blast of compression out of the removed number 1 injector hole.

 

[Jim.ME]

I don’t know the exact ins and outs of timing that pump. If you are doing it per a manual you should have it right. Just like a distributor in a gas engine has to spark on the compression stroke the injector needs the pulse of fuel fed to it in the same manner and in time with the compression stroke. Are we sure this is happening? The engine crankshaft timing mark can also show TDC of the exhaust stroke, it has to be on TDC of compression. I would pull number one injector and undo the lines holders and reconnect the number 1 injector to spray in open air. Then crank the engine and see if the injector squirts fuel in sync with the blast of compression out of the removed number 1 injector hole.

Adding a word of caution. KEEP HANDS, FINGERS, AND BODY PARTS AWAY FOR AN INJECTOR TIP SPRAY! Fuel or oil injected into the skin can have serious results possibly including amputation, even death.

 

[ss55]

I have a Case 900 tractor, barn find. It was last used in the late 80’s, early 90’s. It was running when my father in law parked it in his barn. He recently gave it to me to restore. I replaced all of the fuel filters, repaired a small leak in the tank, and wound up replacing the injector pump as two of the injector pistons were froze up. It started but ran poorly missing and popping no power. I pulled the injectors and cleaned the lines, and pre-combustion chambers. The injectors were in poor shape, three were good one was faulty and two were completely fouled. With new injectors I started over from scratch and completely bled the entire diesel system. To date I have rebled the system 4 times yet the tractor will not start. It will fire on ether or diesel but will not run on diesel for more than a few seconds. I am totally out of ideas as to what else I can do. Also the timing of the injector pump has been checked twice since the new injectors have been installed. Any suggestions would be appreciated.

Could some piston rings be stuck to the pistons, causing low compression, after sitting for over 30 years? That is common on gasoline engines that sit for a long time..

 

[jrobison]

Air, is the air intake clear of debris?

Yes, changed the oil in air cleaner and cleaned out the cup, I also had the intake off when I cleaned the precombustion chambers. Installed the intake with new gaskets.

 

[Tgrasher]

Just to eliminate the possibility, take the cap off the front of the injection pump and see if the rail is free, should work back and forth a half inch or better.

 

[nick831]

Marvel Mystery oil in the engine oil and fuel has worked well for me. A quart in each can free up rings and clean injectors. Just a thought. It would take a little longer but is safe as opposed to trying to put oil in the cylinders. Could bend a rod or hydro lock it up. Sure wouldn't hurt to try a quart in both and run it with clean oil. Good luck. Nick

 

[jon f mn]

Just to eliminate the possibility, take the cap off the front of the injection pump and see if the rail is free, should work back and forth a half inch or better.

I think the 900 has the rotary pump

 

[used red MN]

I think the 900 has the rotary pump

This is a later 900 with an inline. Here is his post from 2022 when he first started working on the tractor. Earlier post

 

[rustred]

I have a Case 900 tractor, barn find. It was last used in the late 80’s, early 90’s. It was running when my father in law parked it in his barn. He recently gave it to me to restore. I replaced all of the fuel filters, repaired a small leak in the tank, and wound up replacing the injector pump as two of the injector pistons were froze up. It started but ran poorly missing and popping no power. I pulled the injectors and cleaned the lines, and pre-combustion chambers. The injectors were in poor shape, three were good one was faulty and two were completely fouled. With new injectors I started over from scratch and completely bled the entire diesel system. To date I have rebled the system 4 times yet the tractor will not start. It will fire on ether or diesel but will not run on diesel for more than a few seconds. I am totally out of ideas as to what else I can do. Also the timing of the injector pump has been checked twice since the new injectors have been installed. Any suggestions would be appreciated.

you are not telling us if you have diesel squirting out of the lines at the injectors. them tractors came out with the psb rotary pump and they are all obsolete. they are a buggar to get bled most times. you need to use an air nozzle with a rag around it and force some air into the tank whie someone cranks it. that balck final canister filter at the front must have fuel coming out before any chance of getting it started. you have bleed it 4 times, but is the fuel being pumped out the injector lines ? is so u should have some smoke when canking it. other wise its out of time. these are easy to time. so is #1 cylinder on compression when u lines up your timing mark?

 

[used red MN]

you are not telling us if you have diesel squirting out of the lines at the injectors. them tractors came out with the psb rotary pump and they are all obsolete. they are a buggar to get bled most times. you need to use an air nozzle with a rag around it and force some air into the tank whie someone cranks it. that balck final canister filter at the front must have fuel coming out before any chance of getting it started. you have bleed it 4 times, but is the fuel being pumped out the injector lines ? is so u should have some smoke when canking it. other wise its out of time. these are easy to time. so is #1 cylinder on compression when u lines up your timing mark?

Oops, that “Like” was a mistake poked wrong spot trying to reply. Look at the link in my reply 10 to his earlier post. It is an inline pump. Some of what you said still does apply.

 

[Ande]

I think the 900 has the rotary pump

Yes, the "900" did have a rotary, the "900B" had the inline Bosch.

 

[rustred]

Oops, that “Like” was a mistake poked wrong spot trying to reply. Look at the link in my reply 10 to his earlier post. It is an inline pump. Some of what you said still does apply.

Well actually most of it applies. Only thing he has is the inline German bosh pump. Came out on the late 900’s. Still needs to loosen them injector lines loosened or even unhooked and see what’s happening.

Yes, the "900" did have a rotary, the "900B" had the inline Bosch.

My 900B has the American bosh pump.