Diego Navarro, John Deere's service marketing manager, boiled down the affects of Tier 3 emissions standards on the maintenance of off-road diesel engines for equipment professionals gathered at Chevron's 2007 Construction Symposium.
"With fuel injection at 30,000 psi, Tier 3 engines are a different animal than what you are used to dealing with," he pointed out. "Injection pressures have increased 10 fold in the past 12 years, and any contaminant in the fuel becomes a dangerous projectile. Fuel hasto be clean and dry.
"What have you done to improve fuel cleanliness and fuel handling?" he challenged.
Navarro also notes that combustion temperatures have climbed with each tier's engine designs.
"Air consumption has doubled since before Tier 1, and we've been forced to add charge-air coolers to many engines," Navarro said. "A plugged air filter is much less forgiving than it ever has been. What have you done to maintain adequate cooling and air filtration?"
Among the many technologies that can be employed to ensure reliable Tier-3 engines (see the graph) Navarro focused on oil filtration.
"Bypass filtration is the best-kept secret in the industry," he says. "It can control particle contamination, remove water, and maintain the oil's TBN (total base number)."