replace your PCV first if it persists you will need to look into why you have so much pressure in the crankcase.
No, never oil the carburetor linkage. Clean the linkage throughly with carburetor cleaner. If you oil the linkage it will become clogged with dust which the oil will attract.
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Marvel Mystery Oil works well.
form_title= Nissan Carburetor form_header= Replace your Nissan carburetor with help from experts. When was the last time your oil was changed?*= _ [50] Do you need a new or used carburetor?*= () New () Used Have you noticed any problems with your Nissan?*= () Yes () No
under the carburetor
The most likely cause for gasoline in the oil is a defective carburetor float and/or needle valve. When defective they fail to completely stop the fuel flowing into the carburetor when the engine is stopped and sets for a week or so. The fuel slowly flows from the carburetor into the engines combustion chamber and eventually ends up in the crankcase with the oil. DO NOT run the engine with gas in the oil or it will be destroyed. Purchase a rebuild kit for the carburetor or bring it to a small engine shop and repair the problem. Change the oil, run for 10 minutes and then change it again to ensure there is no residual gas in the oil. Kevin
the crankcase vents through the breather system.
Most likely, Your float is stuck in the carburetor. If it is stuck open gas will continue to flow into the carburetor bowl, then it will flow into the crank case and cause your oil level to rise. You need to take off your carburetor and adjust the float.
there should never be oil in the carb. if there is then you have a problem. have you tipped the motor on its side on the carb side?
Dirty or stuck open needle valve in carburetor.
probably a head gasket.
Busted diaphragm in the fuel pump. Replace the fuel pump to solve this problem. Can also be a carburetor problem such as a leaking needle valve and seat or a pinhole in the carburetor float. This would require disassembly and rebuilding the carburetor.