Parts for your 1998 Nissan Pulsar-Exhaust gasket

1998 Nissan Pulsar exhaust gasket — what it is, why it matters, and when to replace it

Yes, the 1998 Nissan Pulsar uses exhaust gaskets. That’s confirmed in the Nissan N15 Pulsar Factory Service Manual (Engine Mechanical and Exhaust sections) and the Nissan FAST/EPC diagrams for GA16DE and SR20DE engines. You’ll find gaskets at the manifold-to-cylinder head, the manifold/front pipe joint (the spring-bolted “donut” gasket), and at various flange connections further down the system. They’re standard kit on Aussie and Kiwi N15 Pulsars and are considered normal service items when the exhaust is disturbed.

An exhaust gasket’s job is simple but crucial: seal hot gases as they leave the engine so they don’t leak at the joins. A healthy seal keeps sound under control, stops fumes sneaking into the cabin, protects nearby components, and ensures the oxygen sensor gets clean readings so the engine management can fuel properly. In the Pulsar, a crook gasket can cause a tinny tick on cold start, a sooty mark around a flange, a whiff of exhaust under the bonnet, or even rough running if the leak is before the O2 sensor.

There’s no fixed replacement interval, but they should be inspected whenever the car is on a hoist for service, and replaced any time an exhaust joint is undone. In Aussie/NZ conditions, heat-cycling and road grime can harden or crush gaskets over time, while spring bolts on the front pipe can seize and stop the donut from sealing. If the manifold’s been off, always fit a new manifold gasket, likewise with the donut and any flat flange gaskets.

• Look for: ticking noises at start-up, soot trails at joins, sulphury smells, and louder-than-usual exhaust note.
• When refitting: clean mating faces, replace rusty studs/nuts, use new gaskets, and torque to the figures in the N15 manual (follow the manifold tightening sequence).
• Avoid generic sealants at the manifold or O2 sensor area, the Pulsar’s gaskets are designed to seal dry unless the manual specifies otherwise.
• After work: heat-cycle the car and recheck spring bolts on the front pipe and any accessible flanges.
• If in doubt between a crack and a gasket leak, a smoke test or soapy water (cold engine) can help pinpoint the source.

Keeping the Pulsar’s exhaust gaskets in good nick helps it stay quiet, efficient, and WOF/reg-ready, and saves chasing annoying leaks down the track.

Where are the exhaust gaskets on a 1998 Nissan Pulsar?

There’s a multi-layer gasket between the exhaust manifold and the cylinder head, a spring-loaded “donut” gasket at the manifold-to-front pipe joint, and flat flange gaskets further down the system depending on how the cat and rear sections are configured.

GA16DE and SR20DE layouts differ slightly, but the gasket positions are the same idea: seal each join.

How can someone tell if it’s a gasket leak or a cracked manifold/pipe?

Gasket leaks often tick on cold start and fade as things expand. You may see a neat soot ring at the joint. Cracks are more likely to hiss constantly and can be spotted with a mirror/torch or during a smoke test. If the sound changes when you mist soapy water on a cold joint, it’s likely a gasket.

Should new gaskets be used every time the exhaust is refitted?

Yes. The Pulsar’s gaskets crush to seal once and don’t reliably reseal. Any time the manifold, front pipe, or a flange is undone, fit new gaskets and hardware where specified, then torque to the N15 manual figures.