JD 2940 running rough

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Ohrmundt Simmentals

Ohrmundt Simmentals

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Joined
May 17, 2013
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Central Wisconsin
Our 2940 started running rough with blue smoke. Only does it when you give some rpm's not at idle. Just wondering where you guys think would be the first place you would start looking.

Thanks
 
My first place to look is always replacing the fuel filter. Amazing how many strange problems that has fixed through the years
 
Like Dun said replace the filters first. It usually works out better to start with the simple things that could cause the problem. Did it just start doing this or has it been gradually getting worse? I had a 5000 ford doing the same thing once. Injector pump checked out fine and compression on the cylinders was okay. We took the injectors out and had a fuel injection shop rework them. It run like a new one after that.

Edit: Blue Smoke is usually caused by contaminated fuel or a bad injector.
 
Dun I think you won this one. There were 3 or 4 things we going to look at first. We were going to start looking at the injectors. The filter was on the list but not that high, but picked one up on the way home. That seemed to do the trick. Probably still need to keep an eye on it and check the injectors.

Thanks for input guys!
 
you also neeed to check your oil level.an see if the oil is milky or runny.blue smoke also means a cracked block.been there done that put a new motor in the tractor.
 
B&M Farms":2s6wh8zf said:
Like Dun said replace the filters first. It usually works out better to start with the simple things that could cause the problem. Did it just start doing this or has it been gradually getting worse? I had a 5000 ford doing the same thing once. Injector pump checked out fine and compression on the cylinders was okay. We took the injectors out and had a fuel injection shop rework them. It run like a new one after that.

Edit: Blue Smoke is usually caused by contaminated fuel or a bad injector.
Click to expand...

We had been bailing this past Saturday. Stop for a couple of minutes to put a little fuel in while it was running. A few minutes after starting to bail again was the first time it happened. Then it would run rough for a couple minutes then go normal. Then last night cutting hay it ran rough constant. That's why we suspected something fuel related. We'll still probably check a couple things yet.
 
Ohrmundt Simmentals":2yx2iygm said:
B&M Farms":2yx2iygm said:
Like Dun said replace the filters first. It usually works out better to start with the simple things that could cause the problem. Did it just start doing this or has it been gradually getting worse? I had a 5000 ford doing the same thing once. Injector pump checked out fine and compression on the cylinders was okay. We took the injectors out and had a fuel injection shop rework them. It run like a new one after that.

Edit: Blue Smoke is usually caused by contaminated fuel or a bad injector.
Click to expand...

We had been bailing this past Saturday. Stop for a couple of minutes to put a little fuel in while it was running. A few minutes after starting to bail again was the first time it happened. Then it would run rough for a couple minutes then go normal. Then last night cutting hay it ran rough constant. That's why we suspected something fuel related. We'll still probably check a couple things yet.
Click to expand...
Sounds like contaminated fuel. Probably a little water just not enough to keep it from running. If you change the filter go ahead and drain or syphon the tank too. If the tank is full you can probably just drain half of it or so and make room for some clean diese
 
bigbull338":1pt7npqc said:
you also neeed to check your oil level.an see if the oil is milky or runny.blue smoke also means a cracked block.been there done that put a new motor in the tractor.
Click to expand...

You are correct that low compression from a cracked cylinder, stuck valve, blowed head gasket or any other cause of lost compression can cause blue smoke but it is usually works out to start with the most common :nod: issues when troubleshooting an engine. A compression test for each cylinder would tell. If the engine oil is milky then a compression test would tell you which cylinder is the problem. I would start with he fuel system.
 

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