Parts for your 2003 Mitsubishi Pajero-Exhaust gasket

2003 Mitsubishi Pajero exhaust gasket — what it does and when to replace it

Based on the Mitsubishi Pajero NM/NP (2000–2006) workshop manual (Engine and Exhaust sections) and the Mitsubishi ASA electronic parts catalogue, the 2003 Pajero definitely uses exhaust gaskets. These include the cylinder head–to–exhaust manifold gasket, front pipe “donut”/ring gaskets at the manifold or turbo outlet, and on diesel models (4M41) additional gaskets at the turbo and EGR pipe. So an exhaust gasket is relevant and fitted to this vehicle.

On a 2003 Pajero, the exhaust gasket’s whole job is to keep super-hot exhaust gases sealed inside the system from the head, through the manifold, and down the front pipe. Whether it’s the 3.5/3.8 V6 or the 3.2 Di-D, a good seal stops that annoying ticking on cold start, keeps fumes out of the cabin, protects nearby components from heat, and lets the oxygen sensors read cleanly so the engine runs sweet and efficient.

There’s no fixed replacement interval in the factory schedule, they’re generally “replace on condition” or whenever a joint is disturbed. If the exhaust has been off for a clutch, turbo, or manifold job, new gaskets are a must. The diesel’s turbo and EGR flanges also use crush-style gaskets that should be renewed when loosened. For the V6 and Di-D, it’s smart to replace tired studs and fit new flange nuts at the same time—heat cycles and corrosion can make the old hardware brittle.

When chasing a leak, they’ll look for black sooty marks around the flange, listen for a sharp tick that gets quieter as it warms up, and sniff for fumes under load. A mirror and torch help around the back of the heads and turbo. Surfaces should be cleaned gently (no gouging), and the correct torque and tightening sequence from the manual should be followed. A dab of high-temp anti-seize on studs is handy, but never on gasket faces. After big water crossings or beach work, the Pajero’s exhaust can see thermal shock and salt—worth a check after those trips.

• Common symptoms: ticking/puffing noise, exhaust smell, soot trails, loss of torque, worse fuel use.
• Best practice: use quality MLS/manifold gaskets and the correct-size donut ring, replace whenever a joint is separated.
• Extra tip: sagging engine mounts or warped flanges can cause repeat leaks—fix the root cause with the gasket.

FAQs

Does a 2003 Pajero have exhaust gaskets, and where are they?
Yes. There’s a gasket between the head and the manifold, a ring/donut gasket where the front pipe meets the manifold or turbo, and on 3.2 Di-D models additional gaskets at the turbo outlet and EGR pipe. These are shown in the Pajero NM/NP service manual and the Mitsubishi ASA parts catalogue.

How often should the exhaust gasket be replaced?
There’s no set kilometre interval. Replace if it’s leaking or any time the joint is undone. If you hear a cold-start tick or see soot around a flange, it’s time. After off-road or towing work, it’s smart to give the flanges and donuts a once-over.

Is it safe to drive with a leaking exhaust gasket?
It’ll usually drive, but it’s not ideal. Hot gas can damage nearby parts, fumes can enter the cabin, O2 readings can go off, and on diesels you can hurt spool and torque. It can also fail a roadworthy/WOF. Best to sort it sooner rather than later.