Can Tapping a Starter Motor Really Make It Work?

Tapping on a starter motor can sometimes help it work temporarily if it has a sticking problem. This is because tapping can free up the internal components or make a poor electrical connection better. However, this is generally a temporary fix and indicates that the starter may need to be repaired or replaced.If you find yourself needing to tap the starter frequently, it’s best to have it checked by a mechanic to prevent further issues.

Understanding the Sticking Problem

Sticking in the starter motor can occur due to various reasons such as a faulty solenoid or a stuck throw-in pinion. Different older and modern automotive starters come with their own unique set of issues. For example, in some old Volkswagen models, tapping the starter could help free up brushes that had a habit of sticking, which in turn could allow the engine to start.

The Role of the Starter Solenoid

The starter solenoid plays a crucial role in the starting process. It engages the pinion gear with the flywheel and initiates the rotation. Sometimes, a stuck starter solenoid can be the reason why tapping the starter might help. However, it is not a guarantee and should be addressed by a professional mechanic to ensure safety and efficiency.

Starter Motor's Components and Connections

Modern starter motors have built-in solenoids that engage the cogs before rotation. These solenoids can sometimes have loose connections that a tap can restore, making the starter functional again. Additionally, a very worn starter can have worn-out carbon brushes that no longer contact the commutator. Tapping may get a few more starts out of it, but the underlying issue must be addressed.

The commutator is a critical part of the starter motor. Flat spots on the commutator bars can negatively affect performance. Some enthusiasts attempt to rebuild starters to address these issues, but it often proves futile. A new or factory-rebuilt starter is recommended to ensure reliability.

Case Study: My Backhoe

My backhoe, like any other piece of heavy machinery, has experienced the issue of needing to tap the starter to start the engine. I always keep a heavy object nearby and have found that a fully charged battery reduces the frequency of this problem. Disconnecting the negative battery cable whenever possible further helps to prevent issues. Based on the theories of flat spots on the commutator bars, I have attempted to rebuild several starters with little success. A new or factory-rebuilt starter seems to help resolve these issues efficiently.

Checking Connections and Voltage

Based on the insights shared, I recommend checking all the connections and ensuring that the battery voltage is stable to prevent the need for tapping the starter motor. Loose connections and insufficient battery voltage can both contribute to starting difficulties. By addressing these issues, you can prolong the life of your starter and avoid the need for frequent tapping.