I have a 1983 90 HP Chrysler engine on my boat. The motor has about 85 hours on it. I took it out today for the first time in 4+ years, and it ran like a top. I have heard many times that the impeller should be replaced every year. I looked for one for my motor, but could not find one. The motor is pumping lots of water, and seems to run just fine. I bought the boat used back in 1990, and have put about 45 hours on the engine since then. I have never replaced the impeller on the motor since I bought it.<br /><br />I suppose if a guy uses his motor 400 to 1000+ hours per year, it might be a good idea to replace the impeller every year, for from the way it sounds, if the impeller indeed needs to be replaced every year, the manufacturers must make the impellers with a core of used newspaper surrounded by heat treated bubble gum. What is wrong with aluminum is my question. Practically every thing else on the motor is aluminum, I beleive!<br /><br />Anyway, I do question having someone replace the impeller every year, if they only put 10 to 50 hours on the engine every year, like me.<br /><br />I have overhauled car engines, motorcycle engines, 2 stroke and 4 stroke, and I must say it is a job I do not like to do, very time consuming. I have plenty other things to do other than work on engines. Fortunatly, since I bought this boat, I have not had to do anything to the motor other than replace the plugs, and I have replaced the lower unit oil a few times. I did replace the wood for the seats about 7 years ago. I also cleaned out the gas tank a couple of times. Other than that, zip. <br /><br />Am I missing something here, other than replacing the rubber impeller in the aluminum motor is simply cheap insurance from having the motor overheat when the impeller finally goes south, especially if you are a bass tournament fisherman that puts 8 to 16 hours on the motor every day?
