My 172 has developed a "whine" from the engine bay. This occurs when the revs raise and fall. Not only when im going along, but also when i rev the engine at standstill. Has anyone else had this problem? I read that people have had problems with the waterpump - could it be this? It sounds kinda like a supercharger and it is quite loud. Hopefully it can be sorted at not too much expense.
Anyone else had the same trouble?