At first glance, a failed seal in a locomotive may seem like an isolated problem; however, it can easily have a domino effect that extends to the larger rail system. If one locomotive is unavailable due to a faulty seal, it takes time to repair it or swap in a different engine for the job. Downstream, it can even cause delays, rerouting, missed connections, and even supply chain disruptions. What’s more, depending on the nature of the seal and fluid or parts involved, a failure can be associated with product contamination or loss, cleanup fees, and fines.
Fortunately, you can stay proactive by becoming familiar with the signs of impending seal failure in locomotive applications before they cause widespread problems. Keep reading as we take a look at the most common signs indicating seal failure in locomotives.
Engine Seal Failure Indicators
Engine seal failure can result in loss of engine power and performance, component damage, and unexpected breakdowns. Common signs of engine seal damage and degradation include:
- Excess smoke. Damaged engine seals can allow oil inside the combustion chamber. When this occurs, the engine may produce more smoke than usual, or the smoke may be discolored or bluish.
- Unusual noises. Damaged seals can also cause a locomotive’s engine to make new or unusual ticking, popping, or knocking sounds.
- Rough idling and misfiring. Another potential sign of engine seal is if the engine idles roughly or unevenly. It may even skip a beat (i.e., misfire) as a result of oil entering the combustion chamber.
- Compromised acceleration. Seal failure can even result in a decrease in acceleration power or an overall reduction in engine performance.
Brake System Seal Failure Indicators
A locomotive’s brake system seals ensure the train can stop safely and within the distance expected, which risks injuries to passengers and crew, freight, and other rail cars in the vicinity. Watch for these indications that one or more seals within the brake system may be failing:
- Air pressure issues. The most common indicator of brake system seal failure in a locomotive is improper air pressure. Modern locomotives have compressed air brake systems, and a seal failure can delay air pressure buildup or cause a loss of air pressure.
- Increased stopping distance. Without proper air pressure in the locomotive’s brake system, a train with a failed brake system seal may have trouble breaking effectively. Longer than usual stopping distances are a common sign to watch for.
- Unintended brake release. A leaking or faulty seal in the air brake control valve can also create a loss of air pressure in the reservoir, causing the brakes on one more car to release unexpectedly.
If you suspect locomotive brake seal failure, the train must be removed from service immediately so the seals can be inspected and replaced. This is the only way to verify that the train is safe to operate.
Fuel and Fluid Systems Seal Failure Indicators
Locomotives contain various types of fluids and fuels used for efficient operation. Most of these are sealed in reservoirs, cylinders, or other contained systems to prevent leaks and keep contaminants out of sensitive equipment. When seals fail, hazardous fluids escape, which can cause engine damage or system failures. Common signs of fuel and fluid system seal failures include:
- Visible leaks. The clearest indication of seal failure is a visible puddle or wet area under the locomotive in the location of fuel, oil, or coolant lines and tanks.
- High oil consumption. Less easy to spot visually but just as critical is low oil levels. This indicates the system is using more oil than usual, often because of a slow leak.
- Performance degradation. Poor acceleration, loss of power, rough idling, and reduced fuel economy can all point to a failed or degraded seal that needs to be replaced.
- Engine overheating. If the engine is overheating or temperatures are consistently running higher than usual, this could indicate that a faulty seal caused a coolant leak.
MPRC Seals Keeps Locomotive Sealing Challenges at Bay
Locomotives rely on high-quality seals that can withstand high temperatures and pressures, exposure to corrosive or oil-based fluids, and harsh outdoor operating conditions. It’s critical to monitor all the locomotives in your fleet for signs of failed or degraded seals, and to use the highest-quality seals available.
At MPRC Seals, we manufacture durable O-rings, gaskets, and dynamic seals from materials like FKM and NBR that have excellent thermal and chemical resistance for a long service life.
Since 1982, we have developed innovative materials and techniques to deliver reliable seals for rail industry customers, helping to ensure safe and predictable transport by train.
Contact us today to learn more about our products and services, as well as to request a quote.