case 2290 valve adjustment

Jake Hubbard · Dec 14, 2014

I need a little guidence here. I just did an inframe overhaul to this tractor ( new pistons, rings, sleaves, heads, valves, rod and main bearings). I do not have a dyno to break in this tractor so I improvised and used the feed grinder. No matter what I do the engine smokes until it is up to operating temp. I have a service manual for a 1370 that I got the specs from. I am wondering if something has changed between modles. That book says intake .015 exhaust .025. I did not have the pump done at this time but have checked the timing and it is with I a degree or two of 25 btdc witch is the spec I have found on this site. Any thoughts or ideas would greatly be appreciated
Thanks,
Jake

JD Seller · Dec 14, 2014

I would suspect you have some injectors that are not spraying a good pattern. They are firing correctly but with a poor pattern. After the engine warms up it will burn the poorly atomized fuel better than it will cold.

Many times an injectors wears or plugs and sprays a stream rather than a mist. This larger particulate size does not burn as well as a smaller/finer mist.

IF you can afford it I would have the injectors tested or rebuilt.

Doing an engine overhaul without changing the injectors is kind of like showering and putting your dirty cloths back on.

The injection pump can be out as well but with good injectors the motor will usually not smoke.

Valve adjustment will usually not make an engine smoke.

Also did you use break in oil??? The newer oils are too "slick" for a low powered break in. You can't grind feed long enough to really seat the rings in like you can on a dyno.

screwloose · Dec 15, 2014

I don't know anything about break in oil. But with that said my cousin has been a john deere mechanic for about 45 years (now retired). He still works on tractors at his home. He just finished rebuilding a john deere 4000 engine. Uses regular oil. Starts engine lets it get up to temp. Stops engine. Checks adjustment on valves, re-torques head bolts, drains oil, checks main and rod bolts, puts new oil in, then said go pick some corn.

jm. · Dec 15, 2014

I am with JD on this one. You increased the compression with the new rings but the weak injectors are causing the cold smoke. Then things get hot it will clear up. Find you a good shop and have them checked or just buy a set of exchange ones.

Jake Hubbard · Dec 15, 2014

I appreciate the input but I did forget to mention that the injectors are rebuilt. Im pretty puzzled on this one.

pete 23 · Dec 15, 2014

How is it for starting when cold. Valve recession and piston protrusion comes to mind for me. Case had a lot of problems with their smaller diesel engines with piston protrusion after overhaul. They issued a bulletin that covered it but I do not have that one handy but the specs would be different on that engine anyway. Seems a lot of shops were machining the lower end of the connecting rods and not getting correct dimension between centers of holes for pin and crank end. Then valves and seats being resurfaced lowers comp ratio also. I realize very few ever measure piston protrusion over the block when tearing down and engine and comparing it to the new pistons but it is one of those things that just gets overlooked. Then there is the problem of what the heck do you do about it if you are not satisfied with the protrusion. Some engines, like the CDC 5.9 (cummins) offers different thickness head gaskets for different measuring piston protrusion.

case 2290 valve adjustment

Jake Hubbard

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JD Seller

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screwloose

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jm.

Well-known Member

Jake Hubbard

New User

pete 23

Well-known Member

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