Diesel engine runaway is one of the most dangerous malfunctions that can occur for diesel engines. When your diesel engine starts to run away, it can lead to catastrophic failure and damage. Understanding what causes this issue and recognizing the warning signs early can save you from expensive repairs or even engine replacement. Here’s what you need to know about diesel engine runaway and how to prevent it.
What Causes Diesel Engine Runaway?
Diesel engine runaway happens when an engine starts to consume more fuel than the throttle is set for, leading to uncontrolled revving and possible engine failure. The cause of diesel engine runaway can be factors such as hydrocarbons in the air, as well as paired with age-related wear and tear or the accumulation of debris in the air intake system or turbocharger. In older diesel engines, oil leaks from the turbo or overfilled crankcases could also act as fuel sources when oil enters the combustion chamber, causing the engine to rev uncontrollably and requiring a shut off valve to prevent catastrophe.
See Also: Causes and How to Prevent Diesel Engine Runaway
How Often Should Diesel Engines Be Maintained?
Regular maintenance is crucial to the health of any diesel engine, especially those that are frequently used in demanding environments such as industrial, mining, and oil and gas sectors. Diesel engines should generally undergo maintenance every 5,000 to 7,500 miles (8000 to 10,000km), or 250 to 500 hours of use, though this can vary depending on the manufacturer and engine model. Keeping up with oil changes, air filter replacements, and inspecting the fuel system can help prevent serious issues, including the risk of a runaway.
Can a Diesel Engine Runaway if it is in Need of Maintenance?
Yes, a diesel engine that hasn’t been properly maintained is more vulnerable to runaway. Without routine upkeep, oil leaks, faulty turbochargers, or clogged air filters can lead to the introduction of unregulated fuel into the combustion chamber, which can spiral into a runaway situation. The longer maintenance is delayed, the higher the risk becomes.
7 Signs Something Is Wrong with Your Diesel Engine
Being aware of the early signs that something may be wrong with your diesel engine is critical in preventing a runaway. Here are seven warning signs to watch for:
1. Excessive Black Exhaust
Black, thick exhaust is a clear indicator of an imbalance in the air-to-fuel ratio. Black smoke typically suggests too much fuel is being burned, which could signal that your engine is under stress.
2. Increased Noise and Revving Sounds
If your diesel engine starts making louder than normal sounds, especially a high-pitched revving noise, this could be an early warning of an impending runaway.
3. Blue Smoke
Blue exhaust smoke points to oil burning in the combustion chamber. This could be due to an oil leak in the turbocharger or other engine components. Not only is blue smoke a sign that your diesel is in danger, but it signals a higher risk of diesel engine runaway.
4. Starting Problems
Difficulty starting the engine may suggest a fuel system or compression issue. Persistent starting problems should be checked by a professional, as they may indicate underlying engine problems.
5. Poor Fuel Efficiency
A noticeable decrease in fuel economy could mean your engine is working harder than it should, potentially signaling an issue with fuel injectors, turbochargers, or even compression leaks.
6. Loss of Power
When your engine struggles to maintain power or respond to throttle input, this could indicate several problems, including insufficient fuel delivery, air intake issues, or a clogged exhaust system.
7. Rough Idling
A diesel engine that idles roughly could be experiencing a variety of problems, from worn fuel injectors to improper air intake. This rough idling could escalate into more severe engine issues if left unchecked.
The last thing you want is for diesel engine runaway to be the reason someone didn’t make it home at the end of the day. At Headwind Solutions, our Shocker systems for positive air shutoff and early gas detection are designed to protect your people and assets. Reach out to our team today to learn more about our diesel engine safety systems and prevent diesel engine runaway with the ShockerPASS positive air shutoff system.
How Can a Manual vs Automatic Shut-Off System Help Prevent Diesel Engine Runaway?
When a diesel engine starts showing warning signs—like sudden revving or blue smoke—you only have seconds to act. A full runaway happens fast. The type of safety system you install determines whether you save the machine safely or face a major job-site disaster.
When choosing a positive air shut off valve configuration, you have two options:
- Manual Systems: With a manual system, an operator must notice the runaway and physically flip a switch. The ShockerPASS positive air shut-off system manual configurations use a toggle switch instead of failure-prone pull cables. However, all manual positive air shut-off valves still rely on human reaction time. In an emergency, even a few seconds of delay can mean a completely destroyed engine.
- Automatic Systems: An automatic diesel engine shutdown system like the RPM-controlled ShockerPASS takes human error out of the equation. It constantly monitors engine RPMs. The exact millisecond the engine passes its safe limit, the valve snaps shut, cutting off the air supply and stopping the runaway instantly.
Whether you are working with generators, pumps or working on a remote job site, installing a positive air shutoff valve can help you protect unattended assets and your crew. Not sure which positive air shutoff valve configuration is right for your diesel engine? The ShockerPASS positive air shutoff system is available in both manual and automatic configurations, depending on your site’s compliance requirements for PASS valves. Reach out to our team to learn more about installing ShockerPASS positive air shut-off valves to prevent diesel engine runaway on-site.
See Also: What is an Emergency Air Intake Shut Off Valve?
Preventing Diesel Engine Runaway with ShockerPASS
To avoid the risk of diesel engine runaway, regular maintenance of your diesel engine is essential. Scheduling routine inspections and repairs ensures that oil leaks, air intake problems, and other common issues are identified and resolved early. Additionally, installing a diesel engine shut-off valve can automatically cut off the air supply and stop the engine if a runaway starts. And, of course, always pay attention to any unusual signs your engine is giving you — acting early can make all the difference.
Get a Quote for ShockerPASS Positive Air Shutoff Systems
Looking for an automatic positive air shutoff valve near me? Contact Headwind Solutions to install the ShockerPASS positive air shutoff for your diesel engine, the ultimate defence against diesel engine runaway.