8 Common Reasons for Diesel Truck Repairs

Introduction

Many commercial vehicles are equipped with diesel engines, which are considered more efficient than gasoline engines. Undoubtedly, diesel engines deliver reliable performance, allowing vehicles to operate optimally. However, despite their proven efficiency and reliability, they are prone to several issues that often result in vehicle damage or breakdowns. This blog mentions 8 common reasons for diesel truck repairs.

1. Oil oxidation

Oil oxidation is the reaction between the oil and oxygen present in the engine. It is one of the most common reasons for diesel truck repairs.  It creates harmful acids, breaking down the oil’s lubricating properties.

As the breakdown occurs, the oil becomes thicker, increasing friction within the engine. It also results in the formation of sludge and vanish-like deposits in the oil. This leads to engine clogging, reducing its efficiency.

Oil oxidation cannot be entirely prevented, but its potential impact can be limited. Regularly changing the oil in the diesel engine can prevent and resolve oil oxidation.

2. Lack Of Power

Another reason for diesel truck repairs is a lack of power. It means the diesel engine lacks the power to run efficiently. A clogged air filter, a failed fuel pump, faulty sensors, and other issues can cause it. When the engine lacks power, it results in sluggish acceleration.

It is also unable to reach its normal maximum speed. This collectively impacts the vehicle's performance and the driving experience. It also leads to higher fuel consumption, which raises costs and harms the environment.

Regular maintenance helps prevent power loss in diesel engines. If you notice power loss, have a mechanic inspect it promptly to avoid further damage.

3. Hard Starting 

Hard starting is one of the most recognisable diesel truck repair issues. It refers to a situation where a vehicle takes a long time to start or fails to start altogether. This can happen due to fuel system problems, ignition switch issues, poor fuel quality, engine oil issues, and faulty starter motors.

Longer start times drain the battery, causing it to discharge faster and potentially leading to vehicular failure. Vehicle failure delays operations and results in significant repair costs. It also consumes more fuel to start, increasing fuel usage and cost. This indicates multiple losses for your business.

Timely oil changes and clean filters can help prevent this issue. You can change the engine oil yourself or seek help from a mechanic.

4. Failure Of the Lead-Acid Storage Battery

Lead-acid storage battery failure can occur due to low charge, loose connection, corrosion, sulfation, or ageing. A slow-running or failed battery can lead to engine failure and, ultimately, vehicle breakdown.

As mentioned, a vehicular breakdown leads to delays in business operations, which in turn impact customer satisfaction and profits. It also leaves the drivers stranded in uncertain situations, putting their safety at risk.

Regularly checking the battery's health can help prevent these issues with diesel truck repairs. Replace a damaged or old battery with a new, fully functional one for optimal performance.

5. Fuel Contamination

Fuel contamination occurs when foreign substances, such as water, dirt, or bacteria, mix with diesel fuel. It can also result from fuel supplied from a contaminated source or the use of old, degraded fuel.

Contaminated fuel causes the engine to consume more fuel to start and run, decreasing fuel efficiency. It also results in poor combustion, which can lead to more emissions. Serve contamination can lead to engine failure and vehicle breakdown.

Source fuel from a reliable supplier and clean the fuel tank before refilling to prevent contamination. If the contamination has already occurred, get the fuel tank cleaned or replaced as a priority.

6. High Compression Ratio

The compression ratio is the ratio between the maximum and minimum volume of the combustion chamber during the engine's operation cycle. The diesel engine’s compression ratio is 20:1, which is higher than the average compression ratio of 16:1.

The high compression ratio places greater strain on the engine components, leading to increased wear and tear. It could also lead to overheating, potentially causing a vehicular breakdown or fire. It also results in decreased fuel efficiency.

Regular maintenance can help prevent these problems and extend engine life.

7. Defective Glow Plug

The glow plug is crucial as it facilitates fuel combustion, enabling the truck to start and operate. Its failure results in incomplete or no fuel combustion in the engine. It causes the engine to misfire, which results in poor engine performance.

It leads to a hard start, particularly during cold weather conditions. It may also result in higher emissions, negatively impacting the environment. It also makes your car dirty and odorous.

Regularly inspecting and replacing glow plugs ensures their proper functioning.

8. High Levels of Humidity

High humidity forms vapour in the engine's fuel tank, contaminating it. This reduces the engine’s fuel efficiency and can also lead to its failure.

The humid air causes the air filter to become damp, which reduces airflow and leads to poor combustion. This reduces engine power, hampering overall vehicular performance. It also results in moisture buildup on engine components, causing corrosion. This deteriorates the engine's and vehicle's condition.

Park your vehicle in sheltered, moderate-temperature areas to prevent high-humidity exposure.

Summing It Up

While diesel engine trucks offer reliable performance, they are susceptible to specific issues that should be addressed promptly when they arise. Otherwise, they can impact vehicular performance and compromise its safety.

Regular engine maintenance is one of the most effective ways to avoid diesel truck repairs. It ensures all engine components function effectively and securely, which translates to improved truck performance.

Tata Motors Morocco offers the best-in-class diesel trucks in the commercial vehicles category. These diesel truck engines provide exceptional performance and fuel efficiency. Exactly what your truck needs to deliver consistently, ensuring long-term benefits for your business. Add them to your fleet and optimise your transportation system for peak performance.

FAQs

What are the typical costs of diesel truck repairs?

The cost of diesel truck repairs varies based on the truck model and the type and extent of the damage.

How often should I perform maintenance on my diesel truck?

It is recommended that the diesel truck be inspected at least once a year, and more frequently if subjected to rigorous usage, every six months.

How can I avoid common diesel truck repairs?

The most effective way to avoid common diesel truck repairs is through proper usage and regular maintenance.