Thread: Mercury 20hp impeller replacement

I can't give you detailed instructions, might need to get a shop manual. Libraries usually have ones you can check out if you don't want to buy one. I can give you a heads up about a common mistake folks make when replacing the impeller and that is to make sure the pick up tube in the lower unit mates into the tube on the upper side when you reassemble it. Lot of folks pull the LU off and don't realize the water pickup tube was plugged into a mating part on the Upper unit and when the crank the motor, no water runs out the weep hole nor does it get to the motor to cool it.

look on utube, search for your 80's merc, may have to search for the exact yr or in a range. I was watching some last nite on the 03-05's Merc 40/50 hp, and they all seemed to be identical in methods/steps. Seems faily simple but I do believe the guy (D-Ray) had done a few in his time.

Originally Posted by jimp

look on utube, search for your 80's merc, may have to search for the exact yr or in a range. I was watching some last nite on the 03-05's Merc 40/50 hp, and they all seemed to be identical in methods/steps. Seems faily simple but I do believe the guy (D-Ray) had done a few in his time.

Great idea, should have thought of it. Thanks