My boat is in the marina shop get the running gear replaced that I tore up going aground. Since I was in the mud with the engines running, part of the estimated repair cost was to flush the engines and generator plus replacing all 3 impellars. I talked to the Service Manager today and he said it took his guy close to 5 hours to change the engine impellars because he had to remove some brackets and exhaust hoses to get to it. I don't have to pay for the extra hours over the estimate but is it really that time consuming to change 320 impellars due to the cramped engine compartment?