Perkins 26510211 Air Filter – OEM Primary Element for Diesel Engines

The Perkins 26510211 air filter is a straight-forward OEM primary element designed for reliability in tough operating environments. At about 314 mm in height, with an outer diameter of 155 mm (finned edge around 198 mm) and an inner bore of 87 mm, it drops into the housing without adjustment and seals properly if the canister is clean.

This element is widely fitted to Perkins 1000 series, 500 series, 6.354 and V8.540 engines, often used on generator sets, forklifts, and other industrial equipment where downtime is costly. The pleated media offers solid dust-holding capacity without choking early, while the finned ring helps keep the filter stable under vibration.

For sourcing convenience, it cross-references with Donaldson P181054 / P182054 and Fleetguard AF409K. If you keep a mixed fleet, that interchangeability reduces stocking headaches.

Tip from the field: before installing, wipe down the housing and gasket land, seat the filter square, and never blow out old elements with high-pressure air—it weakens the media. Replace it on schedule and you’ll save the engine from unnecessary wear.