Float Assembly Replacement On A Lawn Mower Engine
This blog is a step-by-step instruction for replacing the float assembly on a Briggs & Stratton lawn mower engine. The most common reasons for replacing the float assembly is when the engine is leaking gas.
Before you begin the replacement, you need to make sure the engine has cooled and remove the wire and boot from the spark plug to prevent the engine from accidentally starting.
Step 1: Use a Phillips head screwdriver to unthread the mounting screws securing the engine cover. Release the starter rope from the retainer and pull the cover off.
Step 2: Use a 5/16 inch socket or nut driver to unthread the screws securing the air filter cover. Remove the cover and the filter.
Step 3: Then, use a Phillips head screwdriver to remove the screws securing the carburetor cover. Pull the cover off and remove the three screws securing the air filter housing. Detach the breather tube to release the housing.
Step 4: Now use pliers to detach the air veins spring and use a quarter inch socket or nut driver to unthread the shoulder bolts securing the vein to the carburetor.
Step 5: Use locking pliers to crimp the fuel line then release the retaining clamp and pull the fuel line off of the carburetor.
Step 6: Use 3/8 inch socket or nut driver to remove the carburetor mounting bolts. Detach the carburetor from the throttle rod.
Step 7: Now use a half-inch socket to loosen the carburetor bowl mounting nut. Unthread the nut and pull off the bowl. Pull out the pins securing the float assembly and lift off the float and needle. You are now ready to install the new float assembly.
Step 8: Transfer the old float to the new one then position the needle and float on the carburetor and secure it with the new pin. Replace the bowl and thread the nut and tighten to secure it.
Step 9: Reattach the carburetor to the throttle rod and secure the carburetor with the mounting bolts. Replace the shoulder bolt to secure the air vein. Reattach the air vein spring, then reconnect the fuel line to the port on the carburetor and secure it with the retaining clamp. Remove the locking pliers, next reattach the breather tube to the breather post and align the air filter housing then rethread the screws and torque them to three and a half foot pounds.
Step 10: Realigned the carburetor cover and rethread the screw with the filter in place. Reposition the filter cover and rethread the screw to secure. Realign the engine cover. Then rethread and tighten the mounting screws.
Step 11: Depress the bail arm and extend the starter rope, then secure it in the retainer.
With the repair completed, reattach the wire and boot to the spark plug. Now your lawn mower should be ready for use.
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