On the Troy Bilt bronco lawn tractor, gasoline fills the crankcase when its stored for a short period of time……….is it the carb?
Yes it is. The float needle and seat are leaking and need to be replaced. I’m assuming it it a Briggs and Stratton engine. Just replacing the rubber tipped needle usually will not stop the leakage, the pressed-in brass seat also needs to be replaced and pressure tested. This would really need to be done by a shop. Not a hard job, just requires specialized tools to remove and install seat and pressure test……….
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Bad for the environment, bad for engine performance
The gas leaks down into the crankcase, where it generates a fine mist of oil droplets from the oil used for lubricating and cooling the engine. In order to prevent the pressure in the crankcase constantly increasing, the crankcase gas needs to be vented off.
If your oil level is too high and you also notice a smell of petrol in the engine oil, there is a good chance that your gasoline engine has an oil dilution. Petrol settles on the cylinder walls during cold starts and is introduced into the oil via the piston ring. This results in a mixing of oil and fuel.
Diesel fuel dilution of the engine oil occurs due to internal leakage of the fuel injection system. Causes vary with different engines, but can be related to sealing ring failure, loose connections, faulty fuel injectors, or even the result of extended periods of idling.
Excess crankcase pressure may also occur if the PCV system vacuum supply becomes restricted. Excessive crankcase under-pressure, (vacuum) can occur if the fresh air inlet becomes restricted or the wrong PCV valve is used.
Common signs include oil leaks, excessively high idle, and a decrease in engine performance, power, and acceleration.
In short, when fuel mixes with the lubricant, it reduces the viscosity of the oil, meaning that the viscosity may be too low to create an oil film capable of withstanding heavy loads and speeds in some parts of the engine. This results in friction between the metal surfaces and wear of the parts.
If you don`t see it there, check the owner`s manual. How Do I Mix Oil and Gas? Never mix the oil and gas directly in the fuel tank. Always mix in a separate, leak-proof container that`s slightly larger than the volume of gas and oil required, and make sure the container is free of dirt or any other materials.
However, long-term exposure to benzene, the most toxic component of fuel oil, is known to cause leukemia. Prolonged or high level exposures to fuel oil can cause kidney and liver damage, nervous system damage, increased blood pressure and reduced blood clotting. Fuel oil leaves the body within 2-3 days.
Gas is less dense than both and will float to the top. Petroleum produced by source rocks will migrate into a “reservoir” rock.
Diesel is much lighter than water (specific gravity is 0.82-0.88, vs. 1.00 for fresh water and 1.03 for seawater). It is not possible for diesel to sink and accumulate on the bottom as free oil.
Mixing of the oil with petrol will cause the formation of gummy layer on the wall of cylinder because engine oil be burnt partially and as well as there will be emissions of poisonous gases which will pollute the environment. Gummy layer formation. Friction inside combustion chamber will be increased.
Diesel engine runaway occurs when a diesel engine ingests a hydrocarbon vapor, or flammable vapor, through the air intake system and uses it as an external fuel source. As the engine begins to run off these vapors, the governor will release less diesel fuel until, eventually, the vapors become its only fuel source.
A CPR or crankcase pressure regulator is nothing more than a pressure reducing valve. When installed on a compressor suction inlet and properly adjusted, the CPR will prevent the compressor suction pressure from ever rising above the CPR`s setting.
Some engines are even fitted with slowdown alarms so that when the oil mist alarm rings, the engine automatically slows down to prevent crankcase explosion. The Crankcase relief doors are also fitted to prevent any damage to the crankcase and ingress of fresh air inside the crankcase.
Crankcase pressure can be prevented by protecting the piston rings. With a cold start, no oil film is yet present on the moving parts. The chance of metal-to-metal contact increases, so that the piston rings wear faster. This can be prevented with the Lindemann Engine Performance Treatment.
Source of crankcase gases
These blow-by gases, if not ventilated, inevitably condense and combine with the oil vapor present in the crankcase, forming oil sludge or causing the oil to become diluted with unburned fuel.
If blowby gas is not properly handled, it can also foul surfaces, increase engine oil consumption and create a health hazard if an engine is operated in an enclosed space. Several factors have driven the development of systems for handling blowby gases from diesel engines.