Parts for your 1987 Mitsubishi Pajero-Exhaust gasket

1987 Mitsubishi Pajero exhaust gasket — what it does and when to replace it

Based on technical sources including the Mitsubishi factory service manual for first‑generation Pajero/Montero (Group: Exhaust) and the Mitsubishi ASA electronic parts catalogue for Gen I models, a 1987 Mitsubishi Pajero is fitted with exhaust gaskets. These include the cylinder‑head to exhaust‑manifold gasket, flange/donut gaskets at pipe joints, and (on turbo‑diesel variants) turbo to manifold and turbo outlet gaskets. Major aftermarket catalogues (e.g., Victor Reinz, Ajusa, Nippon Reinz) also list specific exhaust gaskets for the 4G54 petrol and 4D56 diesel engines used in 1987 Pajeros, confirming the part’s relevance.

On this classic 4x4, the exhaust gasket’s job is simple but vital: seal hot, high‑pressure exhaust gases so they leave via the tailpipe, not the engine bay. At the manifold, the gasket copes with extreme heat cycles and vibration, preventing leaks that can rob torque, make that tell‑tale tick on cold start, and let fumes creep into the cabin. Down the line, flange and donut gaskets keep joints tight as the system expands and contracts on corrugations and long highway runs.

As part of regular servicing, it pays to keep an ear and nose out. Soot tracks around manifold or flange joints, a tapping noise that quietens as it warms up, or a whiff of exhaust under the bonnet are all red flags. If a joint is disturbed during other work—say, pulling the manifold, dropping the front pipe, or removing the turbo—new gaskets should go in as a matter of course.

• Inspect visually at each service interval for soot, black streaks, or loose studs/nuts.
• If replacing: clean mating faces dead flat, chase threads, fit quality OEM‑spec or equivalent gaskets, and follow the workshop’s torque sequence and specs.
• Recheck fasteners after a full heat cycle if the manual allows, heat and vibration can settle the joint.

Older Pajeros can suffer warped flanges or cracked manifolds, if a fresh gasket still weeps, check straightness with a straightedge and address hardware fatigue (studs and copper nuts are cheap insurance). Turbo‑diesel owners should also inspect the turbo inlet and outlet joints—small leaks there can affect spool and EGTs. Look after the exhaust gaskets and the engine breathes better, sounds right, and stays tidy on those long trans‑Tasman kilometres.

Popular questions about 1987 Mitsubishi Pajero exhaust gaskets

Does a 1987 Pajero actually have an exhaust manifold gasket?
Yes. Both the common 4G54 petrol and 4D56 diesel engines use a cylinder‑head to exhaust‑manifold gasket, and most models also have flange/donut gaskets further down the system. Turbo‑diesels add gaskets at the turbo inlet and outlet. This is supported by the Mitsubishi workshop manual and parts catalogues for Gen I Pajero.

How often should the exhaust gasket be replaced?
There’s no fixed kilometre interval. Replace it when there are signs of leakage or any time the joint is separated for other repairs. During routine servicing, inspect for soot marks and listen for a ticking noise on cold start, if found, plan a gasket and hardware refresh.

Is it safe to drive with a leaking exhaust gasket?
Short hops might be possible, but it’s not wise. Leaks can allow fumes into the cabin, reduce low‑down torque, and on turbo models can affect boost response. Prolonged leaks near the head can overheat nearby components and risk burning valves. Best to fix it promptly.