Why would an exhaust manifold crack in a 22r engine?

Answer by  TravisUSMC (979)

These are known for cracking after so many years. They simply wear down over time and the high heats eventually cause it to crack in certain areas. Usually they are small cracks that tend to get bigger over time. They wear out much faster in climates that have cold winters. The change from hot to very cold makes it worse.

Answer by  Amber40 (24961)

Typically manifolds crack due to vibration and heat. As the metal heats and cools it cause the metal to grow and shrink causing stress cracks.

Answer by  JodiJ (312)

There was a problem with the original manufacturing of this engine making it prone to cracking the exhaust manifold under normal use. There are a number of after-marker replacements that will prevent it from re-occurring.