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If you havent changed the impeller when you inspect the water pump as part of the preparations for the winter layup or the spring fitting-out three years is the outer limit. Then slide down the new impeller making sure that the key-way in the hub lines up with the key previously fitted.
How to service and replace your water pump impeller on a mercury outboard.
Change impeller on mercury outboard. How to service and replace your water pump impeller on a mercury outboard. 75hp 90hp 115hp 125hpLarger Optimax outboards run the same water pump as do M. How to Change Impeller on Mercury 99 Long Shaft Outboard - YouTube.
How to Change Impeller on Mercury 99 Long Shaft Outboard. How often should you change the impeller on a Mercury outboard motor. Mercury recommends changing the impeller every 300 hoursits in the owners manual.
Its an easy enough job to do yourself if you have some mechanical skills. How to replace a water pump on a Mercedes 190E. If you do break it you can replace it but sometimes it is easier just to undo the lower radiator hose.
1 Mark the position of the gearshift linkage with a Sharpie then unattach it. 2 Remove the bolts attaching the lower leg to the main body and remove it. 3 Slide the impeller off the spline.
Clean old gasket off housing use new gasket reassemble in reverse order. This gasket has a neoprene bead built in so no cement is required or should be used. Install the new key which sits in the flat on the shaft.
Then slide down the new impeller making sure that the key-way in the hub lines up with the key previously fitted. Its good outboard maintenance pr. The lower unit on Mercury outboards must be removed to change the water pumps impeller.
Replacing the lower unit is part of replacing your water pumps impeller exchanging a drive shaft of one length for another length or replacing the oil seals on drive or propeller shafts. Mercury 4hp outboard 37-13020 Im trying to replace the impeller and the bottom unit will not pull up and out. Comes up about 2 inches and stops.
A YouTube video showed it just lifts out. I have the r. The maintenance schedule for the 150-hp Mercury outboard motor calls for replacing the water pumps impeller after every 100 hours of operation or once a year.
Unlike many of Mercurys larger motors the lower unit found on this model is equipped with a water pump housing that uses a. Changed out the impeller in 1984 merc 75 hp and now having changed out the impeller in 1984 merc 75 hp and now having trouble getting same back on motor boat helm still in neutral and lower unit in forward should I put helm in forward or take to a local mer. Undo two bolts and take off lower section of drive unit.
Another 4 bolts then become visible on a small casing over impeller. Undo and take out impeller and metal ring in which it runs. Dead easy so far.
There is a small keyway that drops out as you take off the casing over impeller. This must be back in place as you reassemble. If you havent changed the impeller when you inspect the water pump as part of the preparations for the winter layup or the spring fitting-out three years is the outer limit.
One manufacturers yearly or 100-hour maintenance schedule does not include an inspection of the water pump and impeller but insists you change the impeller at 300 operating hours or three years whichever comes first. Stand on one side of the outboard at the joint between the lower unit and the rest of the outboard. Position your helper on the opposite side.
Remove the bolts holding the lower unit in place beginning with the bolts nearest the floor. This Mercury outboard water pump was run dry briefly and the impeller literally melted within the housing. You can see the imprint of the impeller on.
Mercury 8 hp 2 stroke Impeller Disconnect the shift rod under the carb port side remove the 4 bolts the hold it to the mid section drop the unit remove the 2 bolts that hold the impeller cup on and change the impeller then rev the process. Wont shift into reverse after impeller replacement The prop will spin freely in neutral only one way in reverse and both ways in forward with clicking sounds I believe. What ever gear your prop is in F N or R then position your throtle lever to match and.
In most cases you will never need to replace the water pump assembly just the impeller. Sometimes the rubber impeller becomes un-bonded to the metal hub making for an inoperative pump. Check if there is any wear or deformities on the impeller if so then replace it.
Also check for deteriorationscoring of the stainless steel base plate along and the housing cup that the impeller sits.