Tractor not starting

[bewildered]

I have a Case 480 LL tractor that won't start. Started great for 30 years now can't get to fire, even with either! Have replaced injectors
and rubber seals throughout the fuel system. Roosemaster pump has been rebuilt. cranks over great but won't fire. Bled air out of system.
Am at a loss on what I can do to get started.

 

[jshwhite]

Are you getting steady fuel at the injector when you crank it and crack the nut at the injector line? (It's helpful to have two people for this job.)

 

[LouNY]

Any smoke out the exhaust while cranking?
If no smoke = no fuel getting into cylinders,
or not at the right time.
Usually no fuel.
Could also check that the air intake is not obstructed.

 

[super55]

With a shot of ether into the intake you would think it would at least have one or two cylinders fire. At that point its making me wonder if its not fuel related and instead air or compression.

Almost sounds like valve timing is off.

 

[thepumpguysc]

When u put the pump on, was the drive shaft in the engine already.??
If yes, u might be 180* out of time..
There is a DOT on the end of the drive shaft..
There is also a DOT inside the pump..
The pump MUST GO ON DOT TO DOT.. to ensure proper pump to engine timing..

 

[bewildered]

Are you getting steady fuel at the injector when you crank it and crack the nut at the injector line? (It's helpful to have two people for this job.)

yes, am getting steady fuel to injectors, have done that procedure multiple times.

 

[bewildered]

Any smoke out the exhaust while cranking?
If no smoke = no fuel getting into cylinders,
or not at the right time.
Usually no fuel.
Could also check that the air intake is not obstructed.

Yes I am getting smoke, air intake is clear, I did check that as well

 

[bewildered]

When u put the pump on, was the drive shaft in the engine already.??
If yes, u might be 180* out of time..
There is a DOT on the end of the drive shaft..
There is also a DOT inside the pump..
The pump MUST GO ON DOT TO DOT.. to ensure proper pump to engine timing..

Good point, I did have some help with this, my brother has been a tractor mechanic his whole life and walked me through this step and also rebuilt the pump for me. But now I'm tempted to check it but reluctant to go through the hassle to remove and re-install.

 

[alexpops]

When did it start having problems? Glow plugs heating up?

 

[bewildered]

With a shot of ether into the intake you would think it would at least have one or two cylinders fire. At that point its making me wonder if its not fuel related and instead air or compression.

Almost sounds like valve timing is off.

How would I check that? I did pop the valve cover to see if maybe I had a valve sticking, but everything looked to be operating, even checked the valve/ rocker arm clearance according to the sticker on the cover and that checked out as well.