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White Smoke Coming Out The Breather Vents On My K241


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#1 Gfann OFFLINE  

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Posted September 26, 2013 - 05:33 PM

This is a Cub 100 I'm dealing with. The cub is my everyday tractor I use for my year 'round doins.

But lately... I starting seeing white smoke come out of the breather vents. I'm thinking the piston or rings might be bad. Are there any other possible causes that I could check first before I start diving into the motor. I don't see white smoke coming out of the exhaust though. That kind of puzzles me. If it's being pushed out of the breather it should come out of the the exhaust. I read that bad timing is also a cause. Which might explain it. If the timing of the exhaust is off, instead of the exhaust going out the muffler it could be partially going out of the breather. Which I guess could be burning some of the oil in the breather. The white smoke isn't heavy it's a faint amount at first but once the engine heats up it gets more visible.

So what do you guys think?
Checking the timing would be an obviously easy thing to eliminate but do you guys have any other possible solutions that'll help prevent me from from having take the whooooole engine apart.

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#2 chris m OFFLINE  

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Posted September 26, 2013 - 06:14 PM

How long has it been since this engine had an oil change?

 

Also how is the engine running now?



#3 Gfann OFFLINE  

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Posted September 26, 2013 - 06:15 PM

Seems like I did it early spring.

#4 chris m OFFLINE  

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Posted September 26, 2013 - 06:46 PM

How is the engine running? If it is running ok then I would just give it an oil change and then just keep an eye on it.



#5 Gfann OFFLINE  

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Posted September 26, 2013 - 06:52 PM

Well it does seem to run a bit rough and it sounds like there is knock in the engine. Which I forgot to mention. I'll have to run it tomorrow and really listen again.

#6 chris m OFFLINE  

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Posted September 26, 2013 - 06:59 PM

Well it does seem to run a bit rough and it sounds like there is knock in the engine. Which I forgot to mention. I'll have to run it tomorrow and really listen again.

In that case it could be rings. But I would still make sure the oil is clean and full. Then run it and see what you notice. Good luck.



#7 Gtractor ONLINE  

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Posted September 26, 2013 - 09:56 PM

I had a K241 on a Gravely 424 that had white blow-by like crazy.  It didn't smoke or knock and ran beautifully.  The problem finally came to a head and I found out it had the skirt broken off the piston.  The pistons skirt was laying in the pan for years until the rod dipper hit it on the down stroke and broke the dipper off the rod so it quit slinging oil.    I sure wish I'd have torn it down to see what was going on in there before it locked up.   :(


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#8 ol' stonebreaker ONLINE  

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Posted September 26, 2013 - 11:30 PM

  A dry and wet compression test should tell if it's the compression rings. That's what it sounds like to me.

                                                            Mike


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#9 Gfann OFFLINE  

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Posted September 26, 2013 - 11:45 PM

I had a K241 on a Gravely 424 that had white blow-by like crazy.  It didn't smoke or knock and ran beautifully.  The problem finally came to a head and I found out it had the skirt broken off the piston.  The pistons skirt was laying in the pan for years until the rod dipper hit it on the down stroke and broke the dipper off the rod so it quit slinging oil.    I sure wish I'd have torn it down to see what was going on in there before it locked up.   :(


Yikes. The moral of that story sounds like a lot of work.
But... On the bright side, there are other minor issues I've been neglecting due to the extensively involved disassembling process required to fix those issues.
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#10 Gfann OFFLINE  

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Posted September 29, 2013 - 01:33 AM

Changed the oil, seems to have got rid of the white smoke.




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