Before you can remove the oil pan from your engine to do internal repairs on your Briggs & Stratton engine, you will need to remove the drive pulley from the power take-off (PTO) shaft extending from the base of the engine. The dive pulley is crucial to run a belt that can run a variety of things while the Briggs & Stratton engine is running.
Set your Briggs & Stratton engine on its side to reveal the drive pulley bolted to the base of the PTO shaft.
Tighten the pipe wrench onto the PTO shaft area above the drive pulley.
Fit the proper-size socket on the bolt holding the drive pulley onto the base of the PTO shaft.
Firmly hold the pipe wrench with one hand as you rotate the socket wrench on the drive pulley bolt counterclockwise.
Pull the bolt out of the drive pulley and pull the drive pulley off of the PTO shaft if it didn't already fall off when you unscrewed it.
A dual-circuit alternator is basically an alternator with two outputs. Briggs & Stratton runs one of these outputs through a rectifier to produce a direct current, or DC, circuit. In essence, this alternator produces alternating current—AC—and direct current.
The AC and DC circuits are used to power different accessories on the lawn equipment. The AC circuit usually powers the lights. The DC circuit keeps the battery charged.
In this configuration, the lights are not connected to the battery. This prevents the battery from being rundown by the lights. This reduces the load on the battery.
Because all of the lights' power comes directly from the AC alternator, the lights cannot be used unless the engine is running. This might pose a problem in rare situations where the lights need to be on while the engine is off.
The dual-circuit alternator consists of three parts. Attached to the flywheel is a series of magnets that produce the magnetic field needed for the alternator operation. Below the flywheel is the AC alternator, which produces two separate AC currents on two different circuits. The final piece is the rectifier. One of the two AC circuits is sent through the rectifier to change the AC current to DC current.
Place the engine on a hard, level surface. Check the engine oil to ensure the proper level.
Turn on the tachometer and set the meter to four stroke.
Wrap the end of the lead coming from the tachometer around the spark plug wire. It's located at the front of the engine and is plugged into the spark plug.
Start the engine and check the reading in the idle position. Rev the engine to the full throttle position and check the reading again. Check these readings against the operator's manual, as every Briggs and Stratton engine has different specifications.
Flip the Briggs & Stratton engine on its side so the PTO shaft is facing toward you.
Tighten the pipe wrench onto PTO shaft above where the drive pulley is bolted on.
Fit the correct-size wrench on the bolt holding the drive pulley onto the base of the PTO shaft.
Hold the pipe wrench with one hand as you rotate the bolt holding the drive pulley onto the PTO shaft with your other hand counterclockwise.
Remove the bolt and pull the drive pulley off the PTO shaft.