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Oil in crankcase is excessivley cantaminated w/ fuel

Fuel drains in crankcase

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U have a cracked case basicly u are screwed there is no fixing it

Posted on Mar 21, 2014


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Too much oil in my lawn tractor now oil is coming out. what should I do?

drain some of it . or all of it . many times a carb float will stick and fill crankcase with gasoline . when this happens many repair shops put an inline shutoff valve in the fuel line

Sep 03, 2017 | Garden

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I have oil in my fuel pump. too much oil was in the crankcase also.

That is not possible. The oil and fuel systems are seperate. It is possible that the floar on the carb is stuck and fuel drained from the tank to carb, then into the crankcase.

Sep 25, 2014 | Briggs Stratton H7159 & StrattonĀ® 5500,...

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IT is likely that the carb is leaking fuel and filling the crankcase with fuel. Causing excessive crankcase pressure forcing oil into airbox through the crankcase vent. Check your crankcase for fuel and/ or being overfilled. If fuel is present fix the carb first, then drain and refill crankcase. After all is fixed run the unit outside for a few minutes and let it burn off excess smoke.

Sep 02, 2014 | Cub Cadet 46" Lawnmower Deck Drive Belt...

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There is oil coming out through the carbs into the four rubber tubes going into what appears to be an (airbox?). Not sure what the box is for. Oil is leaking from box onto the ground through a hose that I...

air boxes usually have a hose coming out of them for just that... to drain the air box of oil or water that gets in it. it doesnt attach to anything, it's just to drain the box onto the ground instead of all over the bike.

Aug 09, 2011 | Yamaha XJ 700 X Maxim Motorcycles

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Gas is poring out the crankcase breather on my 88 softail

The crankcase breather on an 88 model is down low on the engine cases and exits underneath the bike. If you have fuel coming out of this breather, your crankcase is full of fuel due to a leak in the needle and seat of the carb. Your cylinders may be full of fuel as well.

First, turn the petcock off and stop the fuel leak. Then jack the bike up off the ground and shift the transmission into high gear. Remove both spark plugs. Turn the rear wheel by hand in it's normal direction of rotation and make sure the engine is not hydrostatically locked up due to the cylinder being full of gas. Once you know the engine is not locked up. Put the transmission back in neutral.

Now, if you spin the engine with the starter, it will pump the gasoline out of the crankcase. But, it will probably overflow the oil tank. I'd drain about two quarts of oil out of the tank and set it aside. Plug the oil drain hose and spin the engine with the starter for about 15 seconds with the spark plugs out of the engine. Wait three minutes and do it again. Then, drain the remaining oil out of the oil tank and pour the two quarts you initially drained out back into the tank. You're going to finish flushing the engine out with this oil. Spin the engine again with the starter, wait three minutes and do it again. Then, change the oil and the filter. This should get most of the gasoline out. Check your primary to see if the gasoline got into it as well.

Then fix the carb so that it doesn't overflow and remember to turn your petcock off when you get off your bike.

Good Luck

Jun 04, 2011 | Harley Davidson FXST Softail Standard...

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I have briggs and stratton powered mower with the 18.5 v-twin ohv intek engine modle 407777 type 0121-E5 CODE 000512ZYG MY PROBLEM IS THAT MY CRANKCASE IS FULL OFA GAS OIL MIXTURE THE OIL FILTER ALSO...

When the float in the carb sticks, it allows fuel to drain into the cylinder, that runs pass the rings into the crankcase. When the crankcase is full the pistons cannot go down, and the starter won't turn the engine. Drain all the oil gas mixture, and refill with proper oil. Replace float, needle and seat in the carb bowl. Throughly clean fuel passages, and bowl. If motor won't turn, remove spark plug and turn over engine a few times to remove gas oil mixture from the cylinder too.

Oct 02, 2010 | Craftsman 42" Briggs Stratton 20 hp Gas...

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I have CraftsmanLT1000 lawn tractor, Smokes heavily.

Many times a dirty air filter will cause this on this style of engine. When the filter is plugged, it creates a 'rich' fuel condition, and the engine smokes heavily, the excess carbon is drawn into the air filter, and plugs it even more.

check spark plugs, air filter, fuel filter, choke linkages (for full choke/no choke operation) and crankcase oil.

Crankcase oil can become fuel contaminated, thus overfilling the crankcase and filling the crankcase breather with raw oil/fuel, and this is drawn into the air filter, plugging it, and starting this senerio.

If there is fuel in the crankcase oil, drain completely, and refill with fresh oil. Then you need to look towards the carb for an inlet needle sticking, broken, worn.

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Pressure in gas tank

leave the cap cracked open slighlty as to assure no pressure builds, and if the problem accures during that time your problem is somewhere else

Aug 11, 2009 | Heating & Cooling

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On S50 Suzuki Motocycle I have an oil drip from a rubber tube that looks like it comes from up near the air cleaner and exits below the bike. Any ideas before I start taking the seat, tank, etc. off?

The air cleaner(filter) also filters crankcase blowby . Oil accumulates in filter box and drains. The draining is to prevent oil from being drawn into intake an should be addressed by servicing air filter and cleaning out the box. Rapid and excess oil in filter is a n indicator that blowby is considerable. Hardrabbit starts and sudden accelerations play a big part in ring wear and blowby. I've noticed the use of filter sponge placed, not stuffedm in crankcase vent hosebef ore filter housing will separate oil from fumes before they get to airfilter and oil will drain right back into engine instead of collecting in air box. Some crankcase vents are baffled and have a seperation medium factory installed at the enngine end if vent hose. Do not plug the drain or crankcase vent hose. major leaks will sevelope. Over reving will also cause greater oil misting that is carried out the vent with the air. Good luck - note! rapid throttling affects fuel burning eficciency and tends to break down needed cykinder wall lubtication, hastening ring wear. have fun, be safe.

May 10, 2009 | 2005 Suzuki Boulevard S50

1 Answer

Bikes been in storage for 4 years

Your oil pan where you normally drain the oil when changing it IS the crankcase. I would also drain any gas from the fuel tank(s) and put fresh gas in it, and you will probably need a new battery.

Mar 10, 2009 | Harley Davidson FLHR - FLHRCI Road king...

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