Hello experts, have now given my Aero, year 2007, 193,000 km, a new steering chain. The (competent) master of the workshop said, the chain tensioner still had 4 grid reserve, but it would be the right time before the gears and chain guides were damaged. The unsightly valve cover was also painted immediately. Looks just great now and the new chain makes me feel good !! On occasion a 30 mm long crack in the crack at Zyl iner 4 detected and immediately professionally welded. If cracks occur more frequently with the Aero engines ? Your experience with it (if there are such ones ) would interest me very much. Greeting Julefreund