How do you change the water pump impeller on a Mariner 200 hp outboard motor?

Question

How do you change the water pump impeller on a Mariner 200 hp outboard motor?

Answer 1

Drop the lower unit by removing the nuts that hold it together. Don't forget the capscrew that is hidden under the trim zinc. Remove the water pump housing. Slide the impeller up the shaft, then if you are changing the entire pump put in the new pump base. Clean off the saft and splines at the top. Slide the new impeller down the shaft. Put the w/p housing on, it will go over the impeller easier if you twist the prop shaft in the CORRECT direction of rotation. (that way the impeller is oriented correctly). Tighten the w/p housing screws. Grease the splines and slide the lower unit back upo. It will be easier if you have some help and they rotate the flywheel to line up the splines. Don't forget to line up the shift shaft splines also as you put it together. make sure you don't shift it while its apart! Tighten all the nuts and the capscrew. Done

Answer 2

call a marine outboard mechanic and have a few beers while he fixes it.

Answer 3

buy a book it might have to be timed.and save you a lot of monney down the road. its worth 30.00 bucks

Answer 4

split the lower unit off the head. remove the spacer. remove the impeller shaft. remove the water pump housing. ( may have to take the impeller shaft and housing off together). you should then see the rubber waterpump impeller on the bottom of the shaft. remove it with care to not damage the shaft. lubricate the new one with lithimum grease and reassemble in reverse order.

Good luck.