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#4567050 - 11/07/17 04:54 PM 149 cc Kohler blowing oil out of vent
yeehaw1960 Offline


Registered: 05/02/07
Posts: 698
Loc: Nebraska
I have a 149cc Kohler on a Toro mower. It has the auto choke with the vacuum thingy attached. It's hooked to the carburetor...not the engine. It runs very (VERY) well, but while running, it blows (a steady dribble from the vent hose) oil out. It's not overfilled..it's actually about 1/2 way up the safe range.

Suggestions? I figured it had been turned over and needed to purge the oil from the vent. After running ten minutes, it still comes out at a steady (tiny) stream.

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#4567087 - 11/07/17 06:13 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
yeehaw1960 Offline


Registered: 05/02/07
Posts: 698
Loc: Nebraska
A video of the thing running and dripping oil, and a picture of the fiasco.
I changed oil to straight 30wt and it did exactly the same thing. Looks like any vent mechanism it has is internal.

https://www.youtube.com/watch?v=W6GF81dBj14&feature=youtu.be

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#4567131 - 11/07/17 07:01 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
JTK Offline


Registered: 08/14/03
Posts: 10587
Loc: Buffalo, NY
Sure does seem to run well. I'm wondering if there's some type of screen or separator plate that's out of place, causing oil to get thrown out the breather?

I don't see forceful gas out the tube, possibly pointing to a head gasket problem or such.

Does this have an oil dipstick that needs to be read a certain way? Just trying to rule out too much oil.


Edited by JTK (11/07/17 07:01 PM)
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#4567133 - 11/07/17 07:01 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4858
Loc: Houston, Texas
That's your PCV hose their should be a barbed fitting on the inside of the air box.
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4567137 - 11/07/17 07:03 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4858
Loc: Houston, Texas
You must be getting blow by for it to do that.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4567197 - 11/07/17 08:07 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
jeepman3071 Online   content


Registered: 04/15/10
Posts: 4220
Loc: Storrs, Connecticut
Wow that is a decent amount of oil coming out. Does the engine have good compression?
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2000 Jeep Cherokee 4.0L (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4567202 - 11/07/17 08:12 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
Warstud Offline


Registered: 09/02/05
Posts: 5397
Loc: MIchigan
Maybe the valve that allows the air out is stuck open.

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#4567227 - 11/07/17 08:33 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
This seems to be a somewhat common problem with that Kohler engine.
http://www.lawnmowerforum.com/showthread.php/13566-Kohler-courage-spitting-oil-out-breather-tube
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2013 KIA Optima EX 2.4L. Now: Castrol Magnatec GTX 5W30 synthetic & STP S2808ML
2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s

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#4567379 - 11/08/17 02:22 AM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
yeehaw1960 Offline


Registered: 05/02/07
Posts: 698
Loc: Nebraska
I'll adjust the valves tomorrow first thing. Any idea of the clearances? .004 or so?

THANKS!!!

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#4567447 - 11/08/17 07:06 AM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
Manual states: .003 -.005 on intake and exhaust.
_________________________
2013 KIA Optima EX 2.4L. Now: Castrol Magnatec GTX 5W30 synthetic & STP S2808ML
2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s

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#4567544 - 11/08/17 09:09 AM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
JTK Offline


Registered: 08/14/03
Posts: 10587
Loc: Buffalo, NY
It can't hurt on checking the valve clearance, but i'm struggling to understand what this would have to do with oil being pushed out of the crankcase.
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2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)

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#4567622 - 11/08/17 10:16 AM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
One more thing, you may have a blown head gasket. To verify a blown head gasket, pull the dipstick after running the engine for a while. If there is smoke coming from the oil fill tube, you have a blown head gasket.
https://www.gardnerinc.com/manuals/pdf/i..._REV%200510.pdf
_________________________
2013 KIA Optima EX 2.4L. Now: Castrol Magnatec GTX 5W30 synthetic & STP S2808ML
2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s

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#4567664 - 11/08/17 10:48 AM Re: 149 cc Kohler blowing oil out of vent [Re: JTK]
jeepman3071 Online   content


Registered: 04/15/10
Posts: 4220
Loc: Storrs, Connecticut
Originally Posted By: JTK
It can't hurt on checking the valve clearance, but i'm struggling to understand what this would have to do with oil being pushed out of the crankcase.



+1

Valves out of adjustment may cause it to be hard to start or have lower compression if one is hanging open, but I can't really see that being an issue.

My bet is head gasket issue, blow by from rings (poor design) or a PCV issue.

Does this engine blow any smoke out of the exhaust?
_________________________
2000 Jeep Cherokee 4.0L (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4567734 - 11/08/17 11:44 AM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
yeehaw1960 Offline


Registered: 05/02/07
Posts: 698
Loc: Nebraska
I'll look at the valve clearances, but I too think that's not going to be it. It starts on first pull and runs very smoothly. Can't believe the head gasket is blown (or even slightly compromised). Time to look at the dozen or so engines I have laying around (in my way). Will check for smoke from dipstick tube too. Getting a late start!

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#4567807 - 11/08/17 12:48 PM Re: 149 cc Kohler blowing oil out of vent [Re: yeehaw1960]
boraticus Offline


Registered: 04/19/09
Posts: 2905
Loc: Canada
Almost sounds like blow-by increasing crankcase pressure thus forcing oil out the crankcase ventilation tube.

OP mentions that the oil reading is showing half full. What's the process for reading the oil level? Cap screwed down or cap up? That will make a difference regarding how much oil is actually in the crankcase.

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