The tiniest particles can quickly reduce the productivity of even the largest, high-horsepower heavy-duty trucks and equipment. We’re talking about dust, dirt and other contaminants smaller than the human eye can see. Tiny though they are, these particles can cause premature wear to pistons, rings, cylinder liners and other vital engine parts that impacts performance and uptime.

Engine intake air filters are tasked with the important job of protecting engines from these contaminants. To maximize equipment uptime, proper filter servicing and maintenance practices are essential.

Maximizing the uptime of large equipment with high-horsepower engines is a top priority for fleet owners, managers and operators. The dusty, dirty environments in which they work present unique challenges to ensure equipment availability and minimize maintenance costs. Inadequate air filtration can cause engine damage and unplanned downtime.

Here’s why: The engines powering the equipment for these applications are massive; so are the air intakes feeding them. Without proper filtration, dust and other particulate matter (PM) can get into the engines—and especially the critical clearances between pistons and cylinder linings. Over time, these contaminants can contribute to wear on the surfaces of pistons and linings, allowing blow-by gas to escape. This increases oil consumption and reduces horsepower due to a lack of air compression in the engine cylinders.

Inadequate air filtration can also negatively impact the performance and life of turbochargers, which compress the air going into the engine cylinders. If dust is present, the turbocharger’s compressor blades can wear, reducing performance. In addition, dust buildup in the bearings can cause premature failure.

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Fleet and maintenance managers can protect their equipment by using air filters rated to meet or exceed the original equipment manufacturers’ (OEMs) performance expectations.

But what matters most is the efficiency of air filters—literally, how much dust passes through the filter and into the diesel engine.

ISO 5011 testing measures filter efficiency gravimetrically by comparing the weight of dust collected on the media to the weight of the dust that passed through.

What you might not expect is that small differences in efficiency can have big impacts on how well your engine is protected. In the example below, a filter that’s 99.9% efficient lets 10 times more dust pass through it to the engine compared to a filter that’s 99.99% efficient.

Not all filters offer the same performance. Factors that affect filter performance include the type of media used, the total amount of media used, whether multiple types of media are used together and how they are layered, and how the media is pleated all contribute to filter efficiency and service life.

Many air filters include elements made with natural cellulose fibers, but they can also be made with glass or synthetic media, including nanofiber media. Cellulose media is the traditional, low-cost media solution for larger contaminants, but it’s less efficient than modern media.

Nanofiber media offers advantages. Nanofiber features long, continuous fibers of sub-micron diameter that form a tighter mesh than cellulose. For this reason, nanofiber media is more effective at capturing and retaining particles much smaller than cellulose media can. It also provides greater holding capacity than cellulose media.

And while lower-quality filters—that don’t have enough media, the right combination of media, or are simply poorly produced—may save money upfront, they’ll cost more over the life of the equipment. Frequently replacing filters and dealing with machinery breakdowns cost money. If that weren’t bad enough, the price of machine downtime can quickly surpass repair costs. But high-quality filters on high-horsepower engines can meet or exceed OEM-recommended filter ratings and significantly extend service intervals.

Superior filtration solutions for extreme conditions, such as those in mining, combine conventional cellulose media with nanofiber media. Together, they work to provide the most advanced air filtration engine protection available.

Air filters keep diesel equipment running; they should be replaced before operators start experiencing problems—not after. But changing them too early has its downsides, too.

It’s not just by the look of them. A visual inspection may reveal dirty media, but it doesn’t indicate how much filter capacity remains.

To truly know when your air filter needs to be changed, you need an air restriction indicator.

Air restriction indicators provide a basic signal that an air filter needs to be changed. They sense the level of vacuum in the ducting downstream of the air cleaner as an indication of how plugged the filter has become. A plugged filter will have a higher flow resistance and generate higher pressure loss across the filter at a given flow rate.

Restriction indicators enable fleet and maintenance managers to avoid replacing air filters too early or too often, which increases maintenance costs and reduces equipment availability. They also can help avoid replacing plugged filters too late, which can put additional stress on the air induction system and reduce fuel economy or power. With restriction indicators, fleet managers can get the most out of their air filters and maximize engine protection.

Repeated filter changes also can expose high-horsepower engines to more harm; each time a filter canister is opened to remove the element, dust and dirt can enter the air intake system. Secondary filters help prevent this (in fact, that’s their main purpose), but they’re not universally installed on off-highway equipment.

Again, the solution is to minimize how often filters are changed.

There’s an additional reason for concern whenever an air filter canister is opened. Filters are designed with a gasket on the media element that compresses to seal the canister when it’s originally installed. Some equipment operators remove the element and attempt to clean the filter with compressed air or by hitting it to shake out the dust. And when they reinstall the element in the canister, the gasket may not seal the way it should or how a new filter does.

Striking a filter against another object to shake out dust can crack an end cap, creating a leak path in the element. Blowing compressed air through them can tear the pleated filter media. Rarely visible, these leak paths and tears can allow dust to pass directly into the engine and contribute to premature wear.

These practices are best avoided altogether. It may appear to save money in the short term, but over time, the damage they cause will take its toll on your engine’s performance, uptime and/or useful life—any of which can quickly and significantly offset the savings you may have found.

Technologies that monitor filter condition and analyze real-time maintenance needs enable fleet managers and operators to keep equipment running longer. These advanced digital solutions are more precise than restriction indicators.

Systems such as FleetguardFIT reduce maintenance costs by 55% and can achieve a full return on investment in less than six months. This can be accomplished with insights that enable off-highway equipment users to change air, fuel and oil filters only when necessary.

Filter life is highly dependent on the equipment and operating conditions. They don’t get any more extreme than in off-highway applications, where the challenge becomes extending service intervals as long as possible—and then replacing air filters before they become ineffective.

Schedule maintenance too early and productivity declines. Wait too long and clogged air filters can reduce horsepower and performance. And in the worst cases, equipment will wear out faster, leading to unplanned downtime.

Be confident that your diesel engines and equipment will go further—with the protection of filtration science. In the constant dusty conditions of agriculture, construction and mining, high-quality air filters and performing maintenance only when it’s needed can extend equipment life as well as reduce costs.