How can the SuperFlush System really flush the engine without running it? Won the thermostat block part of the engine?
The engine block (where the plugs are), the heads, the intake manifold, exhaust manifold, and the risers are all interconnected in plurality. The thermostat housing is designed to restrict (not block, an important point) the cold water flow into the engine, and is upstream. The engine block injector points are downstream of the thermostat housing, so water below it has no impediments to being discharged through the transom assembly discharge ports, the exhaust ports, and others, depending on manufacturer.. So the short answer is: the water injected into the block assembly fills the block cooling passages first, then the heads cooling channels, then fills the exhaust manifold, then fills and exits through the risers, while the water injected above the thermostat housing filles the intake manifold, the exhaust manifolds, and the risers. There is obviously interconnectivity here. Remember, the thermostat is designed to restrict water flow from the seawater pump. With the engine running in
