Kohler engine oil in carburetor

Kohler engine oil in carburetor DEFAULT

What Would Cause My Lawnmower to Leak Oil Through the Filter?

Oil leaking through a lawnmower's air filter has several possible causes. Some of those causes are simple to remedy while others are more serious problems that require complicated repairs. Sometimes a lawnmower puffs or spews smoke as it burns off excess oil. The lawnmower also may run poorly, shutter to a stop or fail to start.

Tipped Lawnmower

If you tip a lawnmower greater than 15 degrees with its carburetor pointing downward, then oil can leak from the crankcase and into the breather tube. The breather tube is connected to the carburetor, which connects to the air filter. Tipping may occur while you change or sharpen the lawnmower's blade or clean the bottom of the mowing deck. Mowing grass on slanted ground, such as mowing across a hillside, can tip the mower enough to allow its oil to flow toward its carburetor. Tipping the lawnmower so that its carburetor is on the high side helps to avoid the oil problem.

Overfilled Crankcase

Lawnmower crankcases are typically small, often requiring less than 1 full quart of oil. An overfilled crankcase pushes the excess oil in any direction the liquid can move. Although the excess oil often ends up in the cylinder, it also can move into the carburetor and out through the air filter. The best way to avoid overfilling a lawnmower with oil is to add a little oil at a time, and then check the oil dipstick to see whether or not the oil level falls within the safe range, above the "Add" mark but not above the "Full" mark on the dipstick.

Oversoaked Foam Air Filter

A paper air filter soaked with oil must be discarded and replaced. A foam air filter or foam prefilter, however, must be coated with a light application of oil in order to trap dust particles. A filter oversaturated in oil, though, can leak some of that oil around the filter box, or it could get sucked into the carburetor, which gums up that device’s internal jets and needle valves. Squeeze the excess oil out of a foam air filter or foam prefilter. Cleaning the carburetor also may be necessary.

Internal Engine Problems

Internal problems that cause oil to leak through a lawnmower's air filter typically require repair by a small-engine specialist. A blown head gasket is one such issue, and it requires tear down, repair and reassembly of the lawnmower’s engine. Other internal engine possibilities causing the oil problem include a damaged cylinder or worn cylinder rings. All of those components block oil from entering spaces where it does not belong. If they fail, oil can back up through the carburetor and into the air filter.


Writer Bio

Robert Korpella has been writing professionally since 2000. He is a certified Master Naturalist, regularly monitors stream water quality and is the editor of freshare.net, a site exploring the Ozarks outdoors. Korpella's work has appeared in a variety of publications. He holds a bachelor's degree from the University of Arkansas.

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oil in carburetor

Hi there!

Did you ever tip over this mower to get under the blade housing? If you did and it was tilted toward the direction of the carb to long, oil could have run into the carb. Anyway, I can tell you how to correct this but it does not mean it will not do it again depending on what your answer is for my above question. The first thing you need to do is take your carburetor off of the engine, and open it up and clean every nook and cranny including jets float needle valve seat. Every thing on there really well. To get it clean well use gumout spray along with a soft tiny clean brush or clean cloth/rag. After cleaning everything really well, install the carb back onto the engine. Do not start the engine yet. Remove the air filter and replace it. Most likely you have oil in it. After doing that it would also be a good idea to replace the sparkplug. After doing that drain all of the oil out of the engine, it is probably contaminated with gas. After doing that replace with the recommended oil for your engine. Usually it is "SAE 30"

After doing all of that, then you can start the engine and it should run like a charm. After you are done with all of this let us know how it goes!


Last edited by Terminator20; 10-23-03 at 10:22 AM.


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kohler twin trouble. hose blowing oil into carb

If you have compressed air available, you can perform a "Cylinder Leakdown Test" (described in Kohler ser manual, click link below). Follow the instructions in the manual carefully. Don't worry too much about not having a "per cent of leakage" guage, you can use your ears to judge (roughly) how much leakage is taking place. Basically, all you need is an adapter fitting to use the spark plug hole for putting compressed air to the cylinder, and a way to hold the crankshaft from turning.
Each cylinder must be tested individually and the engine position set for each cylinder respectively. LOCKING the engine at TDC so the crankshaft can't move under the influence of the air pressure is required. DO NOT attempt a leakdown test if you can't hold the crankshaft from turning.

*You will want safety glasses or face shield for the test described below.*
You can remove the valve covers (one at a time) and run the engine at idle speed while you watch for puffs of compression leaking into the pushrod gallery.
Look at the picture below and find the red arrows I have added. For your test, do not remove the rocker arms, this was simply the best image I could find to illustrate where to look.
The arrows show where compression would leak into the pushrod gallery (and pressurize the crankcase).
If you don't see any puffs of compression escaping from the head into the gallery at idle, give the throttle a quick jog while you watch.
If you see leakage, the head gasket is defective.

If you opt to do a leakdown test instead of (or in addition to) running the engine as above, you can remove the valve covers and look for escaping air in the same spots shown in pics.


Here is a link that might be useful: ComProHoriz

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Kohler V-Twin Breather Puking Oil Everywhere

Why is fuel mixing with engine oil in the crankcase?

What causes fuel to leak into my engine oil?

If you notice gas mixed in with your engine oil, follow these instructions to address a potential leak.

  • The fuel shut-off valve isn’t closed properly.
  • Fuel float in the carburetor being stuck in the open position due to gumming (caused by stale fuel) or debris.

How do I fix fuel leaking into my engine oil?

  • If your engine has a fuel shut-off valve, ensure that this valve is closed when the engine is not in use.
  • If carburetor problems are causing fuel to mix with your oil in the crankcase, you should perform a thorough cleaning. Find out how to clean your small engine carburetor.

For any other specific questions or concerns related to fuel and oil, make sure to contact a Briggs & Stratton Dealer near you. You can also find carburetor cleaner, lawn mower oil and more service materials in our online store.

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Oil kohler in carburetor engine

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DIY Riding Lawn Mower Maintenance Routine Kohler Engine Oil Change, Air Intake Filter, Fuel Filter

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