Change Your Mercruiser Gear Lube

#Determine what model drive you have.[[Image:Change Your Mercruiser Gear Lube Step 1 Version 2.jpg|center]]
#Read your owners manual.[[Image:Change Your Mercruiser Gear Lube Step 2 Version 2.jpg|center]]
#Buy the correct amount and type of lube plus a little more.[[Image:Change Your Mercruiser Gear Lube Step 3 Version 2.jpg|center]]
#Buy a little hand pump that fits the bottle of lube to fill the drive.[[Image:Change Your Mercruiser Gear Lube Step 4 Version 2.jpg|center]]
#Place a clean oil drain pan under the drive to catch the old lube as it drains out of the bottom of the drive.[[Image:Change Your Mercruiser Gear Lube Step 5 Version 2.jpg|center]]
#Use a large screwdriver and remove the lower drain plug.[[Image:Change Your Mercruiser Gear Lube Step 6 Version 2.jpg|center]]
#Remove the top oil vent plug.[[Image:Change Your Mercruiser Gear Lube Step 7 Version 2.jpg|center]]
#Let the unit completely drain.[[Image:Change Your Mercruiser Gear Lube Step 8 Version 2.jpg|center]]
#If your drive has an internal drive lube monitor bottle in the boat, remove the bottle from its bracket and pour out the old lube. Look in the bottom of the bottle. If you see residue in the bottom of the bottle it should be removed and rinsed out with carb cleaner or Power Tune. Make sure the bottle is clean and dry.[[Image:Change Your Mercruiser Gear Lube Step 9 Version 2.jpg|center]]
#If the old lube looks and smells bad it could be an indication of a problem.[[Image:Change Your Mercruiser Gear Lube Step 10 Version 2.jpg|center]]
#Inspect the gear lube for evidence of metal particles or water intrusion.[[Image:Change Your Mercruiser Gear Lube Step 11 Version 2.jpg|center]]
#If the lube looks bad and you suspect a problem, FIX the problem before placing the drive back into service.[[Image:Change Your Mercruiser Gear Lube Step 12 Version 2.jpg|center]]
#If the lube was simply old and smelly it is a good idea to flush the drive one time with new clean lube.[[Image:Change Your Mercruiser Gear Lube Step 13 Version 2.jpg|center]]
#To flush the drive fill the drive from the BOTTOM hole with enough lube to fill the drive and then let it drain out fully. Do NOT reuse the flushing lube.[[Image:Change Your Mercruiser Gear Lube Step 14 Version 2.jpg|center]]
#Use a sharp pointy pick and make sure to remove the old drain plug gaskets from the drain and vent holes. Never reuse an old drain plug gasket. Old gaskets get brittle and hard as rock. Look closely in the hole and use the pick to make sure all of the old gaskets have been removed. Buy new drain plug gaskets and place them over the cleaned-up plugs.[[Image:Change Your Mercruiser Gear Lube Step 15 Version 2.jpg|center]]
#Fill the drive from the bottom-up until the lube flows out of the top/side vent hole.[[Image:Change Your Mercruiser Gear Lube Step 16 Version 2.jpg|center]]
#Install the top vent plug with the new gasket and tighten.[[Image:Change Your Mercruiser Gear Lube Step 17 Version 2.jpg|center]]
#If your drive has an internal drive lube monitor bottle, continue to pump lube until there is approximately one inch of lube in the monitor bottle.  If you don't, the upper unit will not be lubricated properly.[[Image:Change Your Mercruiser Gear Lube Step 18 Version 2.jpg|center]]
#Remove the lube fill pump from the bottom hole and quickly install the bottom plug with its new gasket.[[Image:Change Your Mercruiser Gear Lube Step 19 Version 2.jpg|center]]
#Wipe up any residual oil.[[Image:Change Your Mercruiser Gear Lube Step 20 Version 2.jpg|center]]
#If your drive has an internal drive lube monitor bottle, add lube to the bottle up to the "full" line. Be aware that the drive might have an air bubble and that the system might "burp" after being run. This could result in a drop of the oil level in the bottle. Just top off the bottle with clean lube and keep an eye on it.  Be sure to loosen the bottle cap to avoid creating pressure in the system.  Pressure in the system will make a mess when the hand pump fitting is removed from the bottom fill hole.[[Image:Change Your Mercruiser Gear Lube Step 21 Version 2.jpg|center]]

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