Help I have gas in my crankcase
If you find gas in the oil, the first thing you need to do is change the oil.
To fix the problem you'll have to pull the
carburetor. Go to your local authorized small engine shop and get a Needle
Valve and Seat kit. (Kohlers, Hondas, and Kawasakis will have the Needle Valve
and Seat come in an entire Carburetor Kit (Includes all gaskets, o-rings, washers, etc). Unfortunately,
with those brands, that is the only way you can get a Needle Valve and Seat.)
The following instructions will help you fix the problem:
1. Stop the fuel flow to the carburetor
by removing the fuel line.
NOTE: MAKE A
NOTE OR DIAGRAM OF HOW THE GOVERNOR LINKAGE IS CONNECTED TO THE THROTTLE ON THE
2. Remove the carburetor.
3. Over a pan suitable for containing gasoline, remove the fuel bowl nut and
the fuel bowl.
4. Turn the carburetor upside down and remove the float and needle valve by pulling out
the float pin.
5. Remove the needle valve from the float.
6. Remove the needle seat by pulling it out with a piece of coat hanger wire
or blow the seat out with compressed air from an air compressor.
Warning: IF YOU CHOOSE TO BLOW THE SEAT OUT WITH AN AIR HOSE, POINT THE
BOTTOM OF THE CARBURETOR AWAY FROM YOURSELF, OTHER PEOPLE, PETS AND THE WALL AND
WEAR SAFETY GLASSES.
Blow the seat out by blowing air through the fuel fitting. Keep blowing until
you hear a popping sound.
7. Get the new seat.
There will be grooves on one side of the seat. When installing the new seat, spray
some WD-40 on it and install the seat so the grooves face down in the
carburetor, (The smooth part of the seat will be facing you). Press in the
seat with a flat punch until the seat bottoms out.
8. Replace the needle valve with the new one in the
kit. (Assemble the wire clip to the needle valve) On Tecumseh engines, the long
end of the clip must face the Choke or air cleaner side of the carburetor. If
you fail to do this, the needle valve will not seat. With Briggs and Stratton,
Kohler, Kawasaki and Honda, it does not matter which way the end of the clip
Note: On Briggs & Stratton 8-22 HP engines, the seat is brass and pressed into the carburetor.
It can only be removed with a Tap and a bolt. It's highly recommended that you take the
carburetor in to a local shop and have them pull the seat out for you and
reinstall the new needle valve and seat kit. Brass is a soft metal and very
easily damaged. They know what they're doing.
9. Assemble the float and needle valve to the carburetor and check the float
level. Make sure the float is parallel to the carburetor body. If you have a
pressure tester, connected it to the fuel fitting. This will tell you if the
seat will hold gas or not. If the seat can hold 5 P.S.I., then it is ok. Install
the fuel bowl and nut.
You should also check for gas in the float. While hte float is removed
shake it & listen for gas sloshing around inside it. It you hear gas
sloshing around inside the float you should replace it too.
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