021-251-235 VW Exhaust Tailpipe Gasket - Type 4 Bus & Porsche 914

Exhaust Tailpipe Gasket – 021-251-235

The 021-251-235 is a specialized high-temperature gasket used in the exhaust system of Volkswagen Type 4 engines. This gasket is positioned between the muffler outlet and the tailpipe or heat exchanger connections. Its primary job is to create a gas-tight seal, preventing exhaust leaks that can cause loud "popping" noises, reduced engine backpressure, and the dangerous infiltration of carbon monoxide into the vehicle's heating system.

In the Type 4 engine, the exhaust system is subject to extreme vibration and thermal expansion. Over time, original gaskets can blow out or disintegrate, leading to loud exhaust notes and decreased heater efficiency. Replacing a worn or missing gasket with the 021-251-235 is an essential step during any exhaust repair or muffler replacement to ensure the system remains pressurized and quiet.

Detailed Vehicle Compatibility

VW Bus (Type 2):

• 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979

VW Vanagon (Air-Cooled):

• 1980, 1981, 1982, 1983

VW Type 4 (411):

• 1969, 1970, 1971, 1972

VW Type 4 (412):

• 1973, 1974

Porsche 914:

• 1970, 1971, 1972, 1973, 1974, 1975, 1976

Product Highlights & Features

• High-Temperature Material: Constructed from a reinforced composite designed to withstand the intense heat of the exhaust gases exiting the Type 4 engine.

• Leak Elimination: Prevents exhaust gases from escaping before reaching the tailpipe, ensuring a quiet ride and proper emissions routing.

• Precision Stamped: Engineered to match the factory flange dimensions for a perfect fit without the need for trimming or modification.

• Corrosion Resistant: Built to resist the corrosive byproducts of combustion, extending the interval between exhaust services.

Technical Specifications

• Part Number: 021-251-235

• Material: Heat-Resistant Composite / Steel Core

• Application: Tailpipe / Muffler Flange Gasket

• Engine Type: Type 4 (1.7L, 1.8L, 2.0L)

Installation & Maintenance Tips

• Flange Preparation: Always use a wire brush to remove rust and old gasket material from the exhaust flanges. A clean, flat surface is required for the new gasket to seal effectively.

• New Hardware: Exhaust nuts and studs are prone to snapping. It is recommended to use new copper-plated or stainless steel nuts to prevent future seizing.

• Even Torque: Tighten the flange bolts in an alternating pattern. This ensures even compression of the gasket and prevents the exhaust flange from bending or warping.

• Heat Cycle Check: After the first few miles of driving, re-check the tightness of the exhaust bolts. The gasket will often compress further after the first heat cycle.

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