How to remove lower unit on mercury outboard motor

Do not force the bolts if they are held fast by corrosion. Use the socket wrench extender and 916-inch socket to remove the hidden bolt holding the lower unit in place.

To look at it youll need to remove the lower unit and the water pump housing.

How to remove lower unit on mercury outboard motor. Remove the trim tab bolt and the trim tab followed by the 15mm lower unit mounting bolt hidden beneath the trim tab. Support the lower unit to prevent it from dropping and remove the four 16mm lower unit mounting bolts from around the top of the lower unit. Remove the lower unit from the outboard.

LOWER UNIT REMOVAL DISASSEMBLY. Always disconnect the battery cable before removing lower unit. Shift to NEUTRAL position.

Remove bolt and trim tab 1. Remove seven 7 bolts 2 and separate gearcase 3 from driveshaft housing. Remove clutch rod from clutch shaft if necessary.

Place a drain pan under oil drain plug. Dec 17 2012. Dropping lower unit on a 2001 150hp mercury 2 stroke motor.

It has to be the speedo hose. If you look just above the lower unit you will see the hose exit the housing there is a hose barb that you unplug the hose at. There is a cable there but it doesnt connect to the lower gearhousing.

How do you remove the drive shaft from a Mercury outboard. Click to see full answer. Regarding this can you run an outboard motor without the lower unit.

Yes you can run it without lower on with water hooked up to it done it before. Dont turn water on all the wayremember the size of the copper tube compared to your hose. Outboard motor - Wikipedia Nell Johnson Since then Mercury has grown out of its barn accommodations and into a leading manufacturer of outboards.

Sealing the gear oil inside the gearcase and keeping water from intruding into the gearcase are the two aims of all the shaft seals o-rings spaghetti seals and gaskets in a lower unit. Use the socket wrench extender and 916-inch socket to remove the hidden bolt holding the lower unit in place. Pull the lower unit away from the rest of the motor twisting the lower unit if necessary to free the drive shaft and shifter.

Use appropriate caution when removing the unit and wear safety shoes. This is for 1980-2005 Johnson Evinrude EnginesWater Pump Kit Reference Chart. Remove the mounting bolts located under the LU flange.

Do not force the bolts if they are held fast by corrosion. Soak with penetrating oil and try again. Remove the trim tab plug from the top of the anti-ventilation plate and unbolt the trim tab.

Pry the retaining clip off the shift shaft retaining pin with a flat-blade screwdriver and remove the pin. Support the lower unit to prevent it from suddenly dropping then remove the four 16mm lower unit mounting bolts. 15 hp 1998 mercury outboard manual shows a coupler wjam nut to disconnect the upper and lower shift shaft for removal of the lower unit my engine has a one piece shaft how do I separate the lower.

I have removed lower units from Evinrude Johnson and Yahmaha outboards and hade to disconect shift shaft by undoing threaded rod. Dont see any such feature on this Mercury. The only way I see to free shift rod is to remove shift.

You can remove and visually inspect most parts of your clogged outboard but not all. You can flush the cooling system with fresh water using a garden hose just as you do when you winterize the outboard. But some parts require a different approach.

One example is the jets and passages in a carburetor which are small some verging on invisible. To look at it youll need to remove the lower unit and the water pump housing. Watch our video on how to replace the water pump on an outboard featured earlier in this article to get this done.

Separating Lower Unit from Powerhead. When you reinstall a lower unit. Although being labeled the father of Mercury Outboards its interesting that Kiekhaefer actually worked as a draftsman for Evinrude outboard motors in 1927 however was fired after just 3 months employment with Evinrude.

Kiekhaefer had 3 unique qualities that made him less than the ideal employee 1 He had a keen eye to see inherent flaws in mechanical designs 2 He often. Clean and prep the lower by removing any and all paint preferably get it to bare aluminumeither by sanding or using a chemical type stripperbe careful not to damage any of the seals. Then use a good quality Zinc Chromate primer under your choice of primer and paintpreferably good quality marine paint but others have used everything.

Thread the lower unit pump tip into the bottom plug hole. Keep the upper plugs out during this time. Gently pump so air doesnt get into the gear case.

When oil begins to trickle from the top vent hole you know that the lower unit is full. Insert Top Vent Plugs. Position a clean 1-quart container beneath the lower unit.

Unscrew and remove the drain plug from the bottom right side of the motors propeller shaft housing using a screwdriver. Remove the oil vent screws on the upper right side of the lower unit and allow the gearcase oil to drain from the lower unit. The proper way to remove the lower unit on a MerCruiser stern drive is completed in two steps.

First you remove the sterndrive and then you separate the lower unit from the upper gear box. It is possible to drop the lower unit while the stern drive.