Parts for your 2004 Nissan Navara-Oil seals

2004 Nissan Navara oil seals

Yes, the 2004 Nissan Navara (D22) absolutely uses oil seals. This is confirmed in the Nissan Navara D22 Factory Service Manual—particularly the Engine Mechanical, Manual/Automatic Transmission, Transfer, Front/Rear Axle and Differential sections—which specify crankshaft front and rear oil seals, camshaft and rocker cover sealing, gearbox input/output shaft seals, transfer case output seals, and differential/axle and hub oil seals. The Nissan electronic parts catalogue for the 2004 D22 also lists these seals across the engine, driveline and axle assemblies, matching what major seal manufacturers catalogue for this model.

On a D22 Navara, oil seals do two key jobs: they keep engine, gearbox and diff oils where they belong, and they keep dust, water and grit out. They protect bearings and gears, stop oil from reaching places it shouldn’t (like a clutch disc or brake shoes), and help maintain proper lubrication and pressures. That’s especially important for utes that tow, work hard, or see corrugations, beach runs and creek crossings around Aus and NZ.

Where they live on a 2004 Navara:

• Engine: crankshaft front seal (behind the crank pulley) and rear main seal (between engine and gearbox), camshaft and timing cover seals depending on engine variant.
• Gearbox/transfer: input and output shaft seals on manual or auto, plus transfer case front/rear output seals on 4x4s.
• Diffs and axles: pinion seals, side/axle seals, and front hub oil seals on live axle/IFS hubs.

Tell-tale signs they’re weeping include oil mist around the front pulley, drips from the bellhousing, a wet diff nose, or gear oil on the inside of a backing plate. If a clutch starts slipping without warning or the handbrake shoes get oily, a seal is a usual suspect.

Good servicing habits help: check underbody and around seals at every 10–15,000 km service, keep an eye on gearbox, transfer and diff oil levels and condition at 40–60,000 km. Replace seals proactively when you’re “in there” anyway—rear main at clutch jobs, front crank seal during front-end/drive belt work, axle and hub seals with bearing or brake overhauls. Quality OEM or reputable aftermarket seals (NBR/Viton as specified) are worth it. Fitment matters: clean and inspect the shaft surface, lightly oil the lip, press square to the specified depth, and torque companion flanges to spec. Also check breathers on engine, diffs and gearbox—blocked breathers create pressure that forces oil past good seals, particularly after water crossings or altitude changes.

For high-use or off-road Navaras, a quick look around the seals after trips pays off. Catching a weep early is far cheaper than replacing a clutch, wheel bearings or diff gears later.

Which oil seals most commonly leak on a 2004 Navara?

Common offenders are the rear main seal (seen as oil from the bellhousing), front crank seal (oil fling around the crank pulley), diff pinion seals (wet diff nose and tailshaft), and front axle/hub seals. Vehicles that tow or see beach work tend to show pinion and hub seal leaks earlier, especially if breathers are blocked.

Can the rear main seal be done without removing the gearbox?

No. On the D22, the gearbox (and transfer on 4x4s) needs to come out to access the rear main. That’s why it’s smart to replace the rear main seal whenever the clutch is being done—saves labour and prevents oil from contaminating a fresh clutch.

What seal material should be used?

Quality OEM-equivalent nitrile (NBR) is standard for many locations, with Viton (FKM) specified in hotter or higher-load spots. For Aussie and Kiwi conditions—heat, towing, and extended highway runs—sticking with OEM or reputable aftermarket brands that match the factory spec is the safest bet.