10-03-2006, 06:03 AM
[quote JoeH]One of the Toyota engines had a tendency to develop head cracks in the metal between the water jacket and the exhaust ports. So it would be hard to trace since the coolant would vaporize in the hot exhaust. Deposits would show up in the exhaust system from the antifreeze. Don't recall if that engine was used in the 89 Corolla though.
I have a hairline crack between a water passage and an exhaust passage on one of my Stage 1 heads. Can't see a leak, and it is small enough that there isn't water vapor in the exhaust. But you do smell the glycol (similar to hot maple syrup). It goes away when the engine gets fully up to temp, as the crack is squeezed closed by the expansion. I have no idea how it happened.
I have a hairline crack between a water passage and an exhaust passage on one of my Stage 1 heads. Can't see a leak, and it is small enough that there isn't water vapor in the exhaust. But you do smell the glycol (similar to hot maple syrup). It goes away when the engine gets fully up to temp, as the crack is squeezed closed by the expansion. I have no idea how it happened.