The starter motor is the high-torque electrical muscle that physically cranks your engine to life every time you turn the key or press the start button. It draws a massive surge of power from the battery to spin a small pinion gear, which then engages the heavy flywheel at the back of the engine to get everything moving at around 200 RPM.
In the heat of a South African afternoon, this compact motor has to overcome the internal friction of the engine and the resistance of thick oil to reach that magic starting speed. Once the engine fires and runs on its own, a spring-loaded mechanism pulls the pinion gear back, allowing the starter to rest until your next trip.
Starters are relatively durable, but most will eventually fail in one or more of the following ways:
If the starter is determined to be faulty, the battery must be disconnected prior to commencing any work. Once the battery is disconnected, the wiring to the starter is disconnected. Starters are bolted to the engine block or the transmission case. Generally, there are two bolts. The procedure to access the starter varies across car models and can require other vehicle components’ removal or lowering. Once the starter is removed, and a new starter is installed, the mounting bolts are tightened to the OEM factory torque specifications. The electrical connections are cleaned and re-attached to the starter. The starter is tested to confirm normal operation.
Once a vehicle engine is running, the starter is not in use. However, if you know that the starter is malfunctioning or working intermittently, you may be left stranded if you turn the engine off and the starter doesn’t function when restarting the engine. Should you know or suspect a problem with the starter, it is best to have the problem repaired to avoid being left stranded.
For a common petrol car like a Toyota Corolla or VW Polo, a mobile starter motor replacement usually costs between R2,800 and R4,500. Larger diesel bakkies and SUVs like a Toyota Hilux or Ford Ranger require heavy-duty starters that can push the price to between R5,500 and R8,500. These ranges include the mobile call-out fee, a brand new or high-quality refurbished unit, and the professional labor. Prices vary significantly depending on whether the starter is easily accessible or buried deep under the intake manifold.
A failing starter motor is the ultimate definition of being stranded. Unlike a weak battery that can often be jump-started to get you home, a dead starter will not respond to external power at all. If it fails while you are out running errands or in a remote parking area after dark, your only option is an expensive tow truck. Replacing it at the first sign of a click or slow crank prevents the stress of being stuck in an unsafe or inconvenient location.