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Remove the Woodruff key from your pocket dab a bit of white marine grease onto its rear edge and insert it in the keyway on the driveshaft. No problem finding the 5 bolts to lower the lower unit about an inch but I do not see any shift rod Jam nut release like I saw on the I.
The impeller may come off with the water pump housing or may remain on the driveshaft.
How to change impeller on mercury outboard. 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.
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. How to Replace Your Mercury Outboard Water Impeller. Most Mercury outboards follow a similar design so the following guide will apply to most models.
The next steps will guide you through the basics for a 60 hp Mercury outboard water pump replacement. Socket 10mm for most models Parts. Remove the four 10mm bolts securing the water pump housing then remove the housing by sliding it up and off the driveshaft.
Remove the impeller and the woodruff key securing it against the driveshaft. The impeller may come off with the water pump housing or may remain on the driveshaft. How to replace water pump in 50 hp MERCURY OUTBOARD - YouTube.
Remove the Woodruff key from your pocket dab a bit of white marine grease onto its rear edge and insert it in the keyway on the driveshaft. Slide the pump impeller down the driveshaft aligned so it slips over the Woodruff key. Push the impeller into place.
Remove bolts or nuts from housing and twist and lift. Watch for small key that fits in the flat slot on shaft. Pull housing and old impeller off and clean inside housing.
Use a small amount of WD 40 to lube inside housing. Replace impeller being sure to line up key on shaft. Pull off a rubber cap on the side of the bottom of the drive leg and undo a screw that joins the two parts of the gear linkage.
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.
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. If the impeller blades are damaged check whether any pieces have broken off.
Find and remove any pieces so they dont end up blocking the cooling system once the lower unit is reinstalled onto the outboard. Remove the woodruff key under the impeller from the driveshaft. Im certain the water impeller is above the gearbox in exactly the same place as Johnson 2hp motors etc certainly not behind the propeller.
Matter of fact I see no need to remove the propeller. Have a look on Utube for TohatsuNissan Mercury water pump replacement. 1973 Mercury 75 Outboard Impeller - Does any know.
How important is it to change outdrive fluid every. Need to finde directions on how to change an impel. Changing impeller on 1995 15 hp merc 2 strk.
Changing Impeller on a Mercury 4hp 4-Stroke. How do you change an impeller in a Merc Cruiser 20. How to change a impeller on a.
70hp mercReplace water pump impeller. Bear-Walker-Valv Thanks for the quick repliesexploded views and linksI have flooded the top of the drive sharft and bottom of shift sharft with CRCmade a slideing hammer from my weight lifting set and rechecked retaining boltsall out except one that is reached from the top of the drive sharft assembly housing transom sideWill have to make a. Slide the impeller over the driveshaft followed by the impeller housing.
While a helper pushes down on the housing turn the driveshaft clockwise to turn the impeller blades in the correct direction and slide the housing down over the impeller itself. 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 the back.
In this case the entire water pump was replaced. When the impeller fails the pump cant pump and the engine will overheat. Ive seen old outboards that got so hot the paint burned.
Jul 8 2011. I am in the process of changing out the impeller on a 2003 Mercury 40hp EFI 4 stroke. I can not see how the gear shift rod gets released on this unit.
No problem finding the 5 bolts to lower the lower unit about an inch but I do not see any shift rod Jam nut release like I saw on the I.