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What is. Amusing devised fuel to enter the oil crankcase

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3 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

Porrelli
  • 167 Answers

SOURCE: Engine stalling due to too much fuel. Fuel in crankcase.

This is a common problem. The needle & seat in the carby is leaking. When the fuel level in the carby raises,the floats also raise & pushes the needle into the seat & shuts off the fuel. Then as fuel is consumed by the engine the float drops,lowers the float & needle & lets more fuel in. This is how the float/needle/seat controls the fuel level in the carby.
Follow these steps

  1. Turn off the fuel tap
  2. Remove the carby bowl. You should be able to do this on the mower(you don't have to pull the carby off).
  3. You will see the float hanging down.
  4. Turn on the fuel tap, see fuel coming out,push up the float gently untill it seats.
  5. See that the fuel stops flowing.
  6. If it doesn't stop flowing you will have to pull the float off(held in place by a small pivot pin) & the needle.(be carefull not to drop the needle).Clean & inspect the needle & also clean the seat. Compressed air is the best for doing this(wear safety glasses as you don't want fuel in your eyes).Drop the float in a small container of fuel & see that it floats(& dosn't sink)Alternatively you can shake the float to see if you can hear fuel inside it.
  7. Re-fit the needle & float & follow steps 4&5
If it still leaks you'll have to fit a new needle & seat.If the float sank you'll have to replace it.
once you've got the float/needle&seat working right,reassemble it & away you go.
Also check the fuel filter,fuel hose&fuel tank are clean.
Also dont forget to put in new oil in the engine.
Also make a habbit of turning the fuel off after use. This will help to stop the fuel from filling the crankcase again.

Hope this helps
Regards Andrew Porrelli

Posted on Dec 05, 2009

amish692307
  • 1 Answer

SOURCE: oil in crankcase is excessivley cantaminated w/ fuel

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

Posted on Mar 21, 2014

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1 Answer

Gas going into crankcase


Hi, Hb there are three ways in which gas can get into your oil tank/system:
1. Someone deliberately pours gas into your oil tank.
2. The vacuum petcock control rubber fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end where it gets pumped back into the oil tank.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until the float needle and seat no longer function properly thus inviting gas to enter the combustion chamber eventually finding it's way to the oil tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.kawasakimotorcycle.org/forum/kawasaki-streetbikes-sportbikes/130968-gas-crankcase-oil.html
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I have a 1993 Honda 125cc was told to mix gas but these oil in crankcase do I need to mix?


You would never mix any fuel and oil for the crankcase. If it is a 2-stroke engine, the fuel and 2-stroke oil will need to be mixed before entering the cylinder. Some engines have an automatic mixing setup - those have a separate oil reservoir for 2-stroke oil, but it will usually be a plastic tank, located nowhere near the crankcase. On a "4matic" engine, it fires like a 4 stroke, but there is no crank case, and the fuel needs to be mixed like a 2 stroke. What is the vehicle you are referencing? A dirt bike or street bike? It seems the CR125 and NR125 are both 2 stroke engines, so somehow the fuel needs to be mixed with 2-stroke oil. Can you take a picture of the crankcase oil cap?

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I have a Robin or as they call it now Subaru engine with this same problem when it stopped the petrol flow into the crankcase. The fuel tap close it when finished and put the engine on TDC then no problem anymore. Check the tap if it REALLY closes as tge only other problem I had was dirt in the carburettor. I cured this with an inline fuel filer

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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.

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Are you refering to the solonoid on the bottom of the carb? That is an anti backfire device. It will not cause the motor to smoke. If it has failed the motor will not run; the solonoid prevents fuel from entering the main jet.
There are several things that wil cause a motor to smoke. First check for fuel in the crankcase. To check for fuel in the crankcase, it is hard to see on the dipstick, remove the dipstick and VERY CAREFULLY away from anything flammable and away from the motor hold a lighter to the dipstick. If the dipstick lights it has fuel on it, a lighter will not ignite oil. Blow out the flame and wipe the dipstick clean with a rag before inserting back into motor. A worn needle or debris in the needle will cause the carb to flood. It will fill the crankcase and muffler with fuel. To cure this you will need to rebuild the carb and change the oil. Installing a shut off valve in the fuel line will prevent this in the future. After the service has been done the unit may smoke for 5-10 minutes while it burns off the fuel in the exhaust.
Burning oil indicates stuck rings, overfilled oil, or worn valve guide seals ( valve guide seals will smoke on start up then clear up).
Also leaking rocker covers will drip oil on the exhaust and burn off.

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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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