The Generator Experts Since 1965 | License #708125 | Contact Us

What can go wrong with a generator engine block heater?

Understanding and Maintaining Engine Block Heaters in Commercial Generators

As a generator technician, you’re likely familiar with the important role an engine block heater plays in commercial generators, especially in colder climates. However, the intricacies of its function, potential issues, and best practices for maintenance might not always be top of mind. This blog aims to provide a comprehensive understanding of engine block heaters, common problems they might encounter, and tips to keep them functioning optimally.

What is an Engine Block Heater?

An engine block heater is an essential component of a commercial generator that ensures the engine is ready to start, regardless of the ambient temperature. Its primary function is to warm the engine coolant, which in turn heats the engine block and lubricating oil.

Johnny Bradford, Duthie Power’s Quality Assurance and Safety Manager, provides a useful analogy, “Just like in your personal vehicle, you get in your car, you turn the key on, you let the engine run, it warms up your engine, and then you go drive it. You don’t go in and start the car; press the pedal, and you go.”

This preheating process prevents the oil from thickening in cold weather, ensuring that the engine can start smoothly and without excessive wear. Without an engine block heater, a generator might struggle to start in freezing conditions, leading to potential damage and decreased reliability. For commercial operations, where uptime is critical, the proper functioning of an engine block heater is vital.

Common Issues with Engine Block Heaters

Despite their importance, engine block heaters are not immune to problems. Here are some common issues you might encounter:

  1. Electrical Failures: The heating element in the block heater can fail due to age, wear, or electrical surges. If the heating element burns out, the heater will no longer function, leaving the engine vulnerable in cold conditions. Johnny adds, “There are a number of different things that you can look at with the block heater, but it is an NFPA 25 regulation that every fire pump has to have an operating block heater in the circuit. You will know when you have to replace your engine block heater if it’s not producing any heat or if there are visible signs of the unit block heater burning.”
  2. Thermostat Malfunctions: Many block heaters are equipped with thermostats to prevent overheating. If the thermostat fails, it can either cause the heater to run continuously, leading to excessive energy consumption and potential damage, or not run at all, leaving the engine block cold. Johnny explains, “You want it to warm up because your generator will go from zero RPM to 1800 RPM.”
  3. Coolant Leaks: Improper installation or wear and tear over time can lead to coolant leaks around the block heater. If  the coolant leaks out and the block heater is not heating up coolant, but it’s heating up the air, it will also burn. This not only reduces the efficiency of the heater but can also lead to more severe engine issues if not addressed promptly.
  4. Corrosion and Scaling: Over time, the heating element can corrode, or scaling can build up, especially if the coolant is not maintained properly. This reduces the heater’s effectiveness and can eventually lead to failure.
  5. Wiring Issues: The electrical wiring connecting the block heater to the power source can degrade over time, leading to poor connections, shorts, or complete failure. This can be caused by exposure to the elements, vibration, or rodents.

Best Practices for Maintaining Engine Block Heaters

To ensure that engine block heaters remain in optimal condition, regular maintenance is key. Here are some tips to help you keep these vital components functioning smoothly:

  1. Regular Inspection: Periodically check the block heater and its associated wiring for signs of wear, corrosion, or damage. Look for any coolant leaks around the heater, and ensure that all electrical connections are secure.
  2. Test the Heater’s Functionality: During routine maintenance, test the block heater to ensure it’s heating correctly. You can use a clamp meter to measure the current draw, which should match the heater’s specifications.
  3. Monitor Coolant Quality: Ensure that the coolant is always at the correct level and that it’s replaced according to the manufacturer’s recommendations. Using the right type of coolant can help prevent corrosion and scaling inside the heater.
  4. Thermostat Testing: If the block heater has a thermostat, regularly test it to ensure it’s functioning correctly. If the heater is running continuously or not at all, the thermostat may need to be replaced.
  5. Keep Electrical Connections Clean and Secure: Check the integrity of the wiring and connectors. Clean any dirt or corrosion and replace any damaged components. Using dielectric grease on connections can help prevent corrosion and improve conductivity.

Prevent Costly Repairs and Downtime

Engine block heaters are a crucial part of ensuring the reliability of commercial generators, especially in colder climates. By understanding their function, recognizing potential issues, and following best practices for maintenance, you can trust that these heaters will operate effectively, keeping engines ready to start when they’re needed most. Regular attention to these details will help prevent costly downtime and extend the lifespan of both the heater and the generator itself.

If you need assistance with repairing your generator’s engine block heater, don’t hesitate to reach out to the Generator Experts at Duthie Power!

Share this post:

Request a Quote

Contact Duthie by filling out the form *or* connect with us on social media!
PHP Code Snippets Powered By : XYZScripts.com