Case 350 smoking bad!

I have recently bought a Case 350 crawler with the 188 diesel. It ran good but had a little miss in the engine. I removed the valve cover and found both pushrods in number 3 cylinder bent. They have been like this for a while because the ends of the pushrods were a little rusted. I put new push rods in it and now it smokes real bad. I have run it about an hour but it is still smoking. Do you think I should just run it for a while or tear it down and rebuild it now?
 
What color smoke is it, does it smell like unburned fuel or oil and, too, is the miss gone? Depending on the answers to those questions as to whether there may still be a real problem, and what it might be. Without knowing more I"d say you might have a burnt valve, or the stem got bent at the same time the pushrod got bent and is not being held slightly open, which would cause it to get burned if you continue running it. Too there is the chance an injector might be screwed up and either injecting too much or too little fuel, or simply not atomizing the fuel that it is injecting properly. Any of those problems could cause it to smoke. Beyond that, trying to say what might be wrong or advising on whether to continue running it is impossible to do without more info.
 
It could be ether related as well. I know of an old Case 1845 with the 188 that burns almost more oil than diesel. They think the rings aren't seating but the machine came from a golf course that's had some very questionable mechanics and operators. It wouldn't surprise me if someone had used copious amounts of ether on it. The one mechanic I knew used ether like a magic elixer and I saw him use large shots of it to start the gas engine greens mowers in the cold shed. No doubt he'd use even more on a diesel.
 
I think you should pull the head,it is very likely the reason the push rods were bent was from broken pistons rings on top of the piston hitting the valves,pull the dipstick with the engine running and see what the blowback is like,if its heavy you may as well pull the head.
Good luck
AJ
 
There are three colors of smoke, black, blue, and white. Black is from incomplete combustion, white is from raw/unburned fuel, and blue is caused by burning oil. The most usual cause is from valve stem seals leaking. This can be caused by old/hardened valve stem seals, or worn valve guides causing too much play in the valve stem, to the point that the seal can't do it's job. Too it can come from oil getting sucked past the piston rings due to the cylinder walls/rings being glazed, etc.

In your case I don't think blue smoke is going to hurt a thing. In fact if you had a cylinder missing for awhile, if you run it long enough with all cylinders firing again, the smoke might go away on it's own. Good luck.
 

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