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K301 oil out the breather


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#1 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 10:51 AM

Got a k301 rebuild and it runs like a champ I had it going for about 30min just driving it around to break it in and see is there was any problems... Well after I shut off the motor I noticed oil dripping I took off the air filter and its coming out of the valve breather. What can I do to fix this?

#2 classic ONLINE  

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Posted December 23, 2016 - 11:09 AM

Generally, when oil leaks from the valve breather, pressure from the cylinder is getting past the rings and pressuring the crankcase. It's possible that you may have assembled the breather incorrectly. Double check that and make sure it's correct. Let us know the extent of your rebuild. Many times, a simple rering job on an engine will not be sufficient. These Kohlers can have badly egg shaped cylinders, and just honing and installing new rings is not good enough. The perfectly round rings will not seat in an egg shaped cylinder for quite a while, or not at all.

Edited by classic, December 23, 2016 - 11:09 AM.

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#3 Bolens 1000 ONLINE  

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Posted December 23, 2016 - 11:16 AM

:ditto:

 

Generally its either worn rings or faulty breather assembly


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#4 EricFromPa OFFLINE  

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Posted December 23, 2016 - 11:23 AM

You might have cracked a ring when you installed the piston.Or the cylinder is to worn for the rings to seat properly. Or the breather assembly is installed incorrectly. Or the reed valve is hanging up from the Filter material falling apart and getting stuck between the reed valve and seats. 

 

I would disassemble the breather assembly and clean it up and reinstall it.The filter material in them tends to fall apart over time and hunks of it will get stuck in the reed.

 

 

 

s-l1600.jpg

 

 


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#5 boyscout862 ONLINE  

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Posted December 23, 2016 - 11:30 AM

On a rebuild job you should only run the engine for a short while. Then stop it and change the oil. That first oil will look like metal flake paint because of all of the metal particles in it. If it looks bad, change the oil again at about 2 hours. A few quick oil changes can make a big difference in the length of life of an engine. Good Luck, Rick


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#6 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 12:24 PM

I put new rings and points and double checked rings the cylinder was not egg shaped

#7 KennyP ONLINE  

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Posted December 23, 2016 - 12:31 PM

Check that everything in the breater is put together correctly. Also, it may take a while for the rings to 'seat' in! You did hone the cylinder I hope.



#8 Cvans ONLINE  

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Posted December 23, 2016 - 12:31 PM

I put new rings and points and double checked rings the cylinder was not egg shaped 

 

Pull the breather apart and make sure all the parts are present and in good condition. 



#9 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 12:40 PM

There is a very small amount of air coming out when engine is running through the breather hole I checked to make sure I had the oil hold in the right spot and reassembled it and tightened it down
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#10 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 12:43 PM

On a rebuild job you should only run the engine for a short while. Then stop it and change the oil. That first oil will look like metal flake paint because of all of the metal particles in it. If it looks bad, change the oil again at about 2 hours. A few quick oil changes can make a big difference in the length of life of an engine. Good Luck, Rick


I ran it for about 5 minutes and checked it then about 10minutes this time I was driving it around for about 30 minutes and this is the first time it did this

#11 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 01:19 PM

There is a lot of oil build up behind the breather what could cause this?

#12 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 01:27 PM

It also doesn't seem to start coming out until I stop the engine

#13 EricFromPa OFFLINE  

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Posted December 23, 2016 - 07:37 PM

Sounds like the Reed isn't seating or your breather is upside down. They have small drain hole and if it's plugged or the breather is installed upside down it won't drain.

 

Here's an upside down breather. Reed seats marked in Blue,Drain Hole marked in red. Make sure there both clean and the reed valve has no rust or dirt on it or it won't seat properly.

 

 

 

s-l1600 (1).jpg


Edited by EricFromPa, December 23, 2016 - 07:38 PM.

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#14 WoodyChuck OFFLINE  

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Posted December 23, 2016 - 10:09 PM

I found the problem the cover is bent so it wasn't getting a full seal.
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#15 EricFromPa OFFLINE  

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Posted December 24, 2016 - 04:43 AM

Oh sweet.

 

Super glad it was something simple lol.

 

While your at it change your oil and re-torque your head bolts/nuts. Supposed to only let it run 5-10 minutes after rebuild before re-torqueing the head bolts. Oil should be changed at 15-20 minutes the 1st time. Then crank her up and run at varying throttle between 1/2 and wide open for about 1 hour and do a final oil change and check the head bolts again.

 

After that you should be good to go.Change oil every 100 hours after that and it should last ya a very long time.


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