Parts for your 1988 Mitsubishi Pajero-Manifold gasket

1988 Mitsubishi Pajero manifold gasket — what it does and when to replace it

Yes, a manifold gasket is absolutely used on a 1988 Mitsubishi Pajero. Both the intake manifold gasket and the exhaust manifold gasket are specified in the factory literature, including the Mitsubishi Motors Pajero Workshop Manual (1983–1991, Engine sections: Intake and Exhaust Manifolds) and common service guides such as the Haynes Mitsubishi Pajero 1983–1996 Repair Manual and Gregory’s Pajero 1983–1996. These sources list the gaskets as standard service and overhaul items across typical 1988 engines like the 2.5L 4D56 diesel, the 2.6L 4G54 petrol, and the 3.0L 6G72 V6 where fitted.

The manifold gasket’s job is straightforward but critical. On the intake side, it seals the manifold to the cylinder head to maintain correct vacuum and air–fuel delivery, preventing lean running and rough idle. On the exhaust side, it keeps hot gases from escaping before the turbo (on diesels) or before the downpipe, which protects nearby components, preserves torque, and keeps noise and emissions in check. Materials vary—graphite, composite, multi-layer steel, and metal crush rings are all used depending on engine and position.

As part of regular servicing, it’s worth inspecting for leaks, loose fasteners, heat staining, or sooty marks around the exhaust manifold, and for hissing or fuel odours around the intake. A ticking noise on cold start that fades warm often points to an exhaust leak. Turbo-diesel owners may also notice slower spool or a whiff of fumes in the cabin if the gasket is gone.

• Common symptoms of a failing manifold gasket:
  • Rough idle, poor economy, or a lean code after intake work
  • Ticking/whistling under load, soot tracks, or fumes near the exhaust manifold
  • Boost loss (4D56T) and exhaust smell under the bonnet

1. Always fit a new gasket after removing the manifold, don’t reuse the old one.
2. Clean and de-grease mating faces, check manifold flatness, and replace tired studs/nuts.
3. Follow the workshop manual torque values and tightening sequence, re-check torque after a heat cycle if the manual specifies it.
4. Avoid generic sealants unless the manual calls for a dab at specific joints (e.g., corners or end seals).
5. Choose quality OEM or reputable aftermarket gaskets, MLS or graphite types are common for durability on the exhaust side.

Done properly, a manifold-gasket replacement restores smooth running, keeps the cabin free of fumes, and protects the head and manifold from warping—exactly what the factory manuals for the 1988 Pajero intend.

Popular questions

Which manifold gasket does a 1988 Pajero need—intake or exhaust?
Both are used. The intake manifold gasket seals the air/fuel path to the head, while the exhaust manifold gasket seals hot gases on the way out. Check engine code (e.g., 4D56, 4G54, 6G72) to order the correct pattern and ports.

Can driving with a leaking manifold gasket cause damage?
Yes. Exhaust leaks can overheat nearby parts, warp flanges, and on turbo diesels reduce boost and spool. Intake leaks can cause lean running, misfires, and higher combustion temps. Fix leaks promptly to avoid bigger bills.

Should sealant be used with a Pajero manifold gasket?
Generally, no. The workshop manuals specify dry-fit gaskets, with any sealant limited to noted joints if required. Overuse of RTV can squeeze into ports and create issues. Stick to the manual’s guidance.