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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Case 350 smoking bad!

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Author  [Modern View]

11-03-2013 20:33:19

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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.

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Case crawler owner

11-07-2013 06:07:15

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 Re: Case 350 smoking bad! in reply to NCWayne, 11-03-2013 20:33:19  
Thank you all for the responses and info. The smoke is blue. I put a new injector in it but it is still smoking, not as bad though.

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11-07-2013 22:29:17

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 Re: Case 350 smoking bad! in reply to Case crawler owner, 11-07-2013 06:07:15  
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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Stick welding

11-03-2013 21:11:53

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 Re: Case 350 smoking bad! in reply to NCWayne, 11-03-2013 20:33:19  
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.

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