Parts for your 1987 Mitsubishi Pajero-Air filter

1987 Mitsubishi Pajero Air Filter

According to Mitsubishi Motors service literature for the first‑generation Pajero (L040 series) and independent workshop manuals such as Gregory’s and Haynes, the 1987 Mitsubishi Pajero is fitted with a replaceable engine intake air filter housed in a sealed air cleaner box. Both the common petrol 4G54 and diesel 4D56/4D56T engines use a paper‑element filter designed to stop dust and grit before they reach the cylinders.

On a 1987 Pajero, the air filter’s job is simple but crucial: keep harsh Aussie and Kiwi dust out while letting the engine breathe freely. A healthy filter helps maintain power on hills, smoother throttle response around town, cleaner oil between services, and better fuel economy. Off‑road or on gravel, it’s doing even more heavy lifting, catching the fine stuff that can quickly wear rings, bores, and turbo compressor wheels on diesel models.

Service manuals specify routine inspection and periodic replacement. As a practical guide for local conditions:

• Inspect every 10,000 km or 6 months, replace about every 20,000–30,000 km or 12 months.
• If you drive in dusty or off‑road conditions, check it after each trip and be prepared to replace closer to 10,000–15,000 km.

For the factory paper element, don’t wash it. You can gently tap out loose dust or use low‑pressure compressed air from the clean side out, holding the nozzle back to protect the pleats. Once the media looks dark, clogged, or damaged, fit a new element. When installing, wipe the airbox clean, check the lid seal, seat the filter squarely, and latch the clips evenly to avoid unfiltered air bypass.

Signs the Pajero’s air filter is due include a noticeable drop in power, increased fuel use, richer exhaust smell (petrol) or more smoke under load (diesel), and visible dirt packed deep in the pleats. Many 1987 vehicles were not supplied with a cabin pollen filter, so don’t be surprised if you only find the engine air filter—aftermarket cabin kits exist but weren’t factory on most models.

Staying on top of this simple service item protects the engine and keeps an old‑school Paj running sweet, whether it’s commuting, towing a tinny, or exploring corrugated back roads.

• How often should the 1987 Pajero air filter be replaced?

For typical mixed driving, plan on replacing it every 20,000–30,000 km or annually, with a check at 10,000 km. In dusty, off‑road, or farm use, shorten the interval, many owners swap at 10,000–15,000 km to protect the engine, consistent with Mitsubishi and Gregory’s service guidance for L040 models.

• Can the original paper air filter be cleaned and reused?

Only lightly. You can tap out loose dust or blow low‑pressure compressed air from the clean side outward. Don’t wash or oil a paper element. If the pleats are stained, torn, or still restricted after a gentle clean, replace it.

• Does a 1987 Mitsubishi Pajero have a cabin (pollen) filter?

Most 1987 Pajeros weren’t fitted with a cabin filter from factory. Some aftermarket retrofit kits exist, but the serviceable filter you’ll routinely maintain is the engine air filter in the airbox.