Hello dear Impreza friends, after changing the timing belt incl. water pump, tensioning roller and pulleys a sound has remained that one could call whimpering and can be heard quite well. Troubleshooting remained unsuccessful regarding a more precise limitation of the error. Housing removed –> has no grinding traces and noise remained. Attachments by removing the V-belts remained docked –> noise. Engine runs round and without slipping gear fits on the forehead wheels. Riemens is not too high noise should actually come from the front wheel although it can be heard throughout the engine compartment. Overall, an replacement turbocharger came in and the cylinder head seal was changed incl. tarpaulining of the heads and the housing and renewal of the clutch. Has someone experience with it or an idea what is the cause. Greeting and many thanks in advance. Wolfdieter