Exhaust seal ring for heat exchangers. Porsche 964 / 993  ❭  99311119500

Exhaust Crush Sealing Ring for Heat Exchangers
Sold each - 6 required per car

Restore a gas-tight seal to your Porsche exhaust system with this OE Match Exhaust Crush Sealing Ring, designed for the Porsche 964 and Porsche 993 heat exchanger assembly. Manufactured to original equipment specifications, this premium exhaust sealing ring compresses during installation to create a secure seal between exhaust components, preventing exhaust gas leaks while maintaining optimum engine performance.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) TURBO S 1994-97

Diagram ref no 3

Whether you're replacing heat exchangers, installing a new silencer or carrying out engine or exhaust maintenance, fitting new crush sealing rings is essential to ensure a reliable and leak-free exhaust system.

What Does the Exhaust Crush Sealing Ring Do?

The exhaust crush sealing ring is installed between mating exhaust components where it forms a high-temperature gas seal once compressed during assembly.

Its primary functions include:

• Creating a gas-tight seal between exhaust components.
• Preventing exhaust gas leaks.
• Maintaining correct exhaust back pressure.
• Supporting optimum engine performance.
• Reducing unwanted exhaust noise.
• Helping protect surrounding components from escaping hot exhaust gases.

Because the sealing ring is designed to deform during installation, it provides a highly effective seal capable of withstanding extreme exhaust temperatures.

Why Do Exhaust Crush Sealing Rings Fail?

Exhaust sealing rings operate under constant exposure to high temperatures and pressure. Common causes of failure include:

• Compression during initial installation.
• Reuse after previous removal.
• Continuous heat cycling.
• Corrosion from moisture and condensation.
• Exhaust system movement.
• Age-related deterioration.

Once compressed, the sealing ring cannot return to its original shape, making it unsuitable for reuse.

When Should the Exhaust Crush Sealing Ring Be Replaced?

Replacement is recommended whenever:

• Heat exchangers are removed.
• Exhaust silencers are replaced.
• Exhaust manifolds are dismantled.
• Exhaust leaks are detected.
• Engine rebuilds are carried out.
• Any exhaust joint using the sealing ring is disturbed.

Most Porsche specialists recommend fitting new crush sealing rings every time the exhaust system is dismantled to guarantee a proper seal and avoid future exhaust leaks.

Related reference numbers
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99311119500

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