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smoke normal on JD2640


 
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svenandersen
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PostPosted: Mon Jan 21, 2013 7:10 pm    Post subject: smoke normal on JD2640 Reply to specific post Reply with quote

I have a JD 2640 and when it idles, I get some (white) smoke coming out under the engine. Is this normal? How much?
 
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leon
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PostPosted: Tue Jan 22, 2013 3:15 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

That's called blow-by - combustion gasses blowing by the piston rings into the crankcase, then vented out of the engine block by a vent tube that extends downward toward the bottom of the engine. Some blow-by is normal. It's much more visible in the winter than summer.
 
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Tx Jim
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PostPosted: Tue Jan 22, 2013 3:55 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote


Moisture will also cause more visible blow-by(vapor) coming out breather tube. Remove rad cap while engine is cold,crank engine and look for tiny bubbles in coolant.
 
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buickanddeere
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PostPosted: Tue Jan 22, 2013 6:33 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

Cold idle, warm idle? Looking at smoke against a blue or grey sky? Or against an outline of trees?
What about smoke at fast idle?
Hours on engine and condition?
Ever service the injectors?
Any smoke at full load?
Oil consumption?
 
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svenandersen
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PostPosted: Tue Jan 22, 2013 6:52 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

Thanks for your information and advice all you guys.
It's grey smoke against the grass grass. I only notice it when its in park and there's no air movement. I don't really know about slow/fast idle. It's got 5000 hours. I've only had it 6 months and I don't know about the injectors. Again, because I've put so few hours on it, I don't know about oil consumption.
 
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svenandersen
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PostPosted: Tue Jan 22, 2013 6:53 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

Just to follow up, if there are bubbles, that means.........?
 
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svenandersen
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PostPosted: Tue Jan 22, 2013 6:56 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

Thanks for your reply. That's what I was hoping to hear. There's no visible liquid (oil, water) showing around vent.
 
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wilamayb
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PostPosted: Tue Jan 22, 2013 7:09 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

Tiny bubbles in coolant would mean that combustion is reaching the cooling system from either piston liners, cylinder head gasket or cylinder head.
 
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buickanddeere
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PostPosted: Tue Jan 22, 2013 9:18 am    Post subject: Re: smoke normal on JD2640 Reply to specific post Reply with quote

Slow idle is no load and 700 or so rpm. Fast idle is approx 2400rpm and no load.
Consult the operators manual for the actual numbers.
Obtain a coolant test kit from the dealer that tests the corrosion inhibitor which few operators seem to even know about. If the coolant is old or originonal. The wet sleeves maybe cavitated through and why the previous owner sold the tractor.
Run an oil analysis kit on the crankcase oil . Don't need to add to problems with antifreeze tearing the bearings out.
 
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