Slide the lower unit straight down and off the outboard. Set the lower unit upright in a bench vise. Remove the four bolts holding the water pump together from the water pump housing with a socket wrench. Slide the impeller from the lower unit and slide them up and off the driveshaft.
How do you remove a lower unit drive shaft?
Remove the four bolts holding the water pump together from the water pump housing with a socket wrench. Slide the impeller from the lower unit and slide them up and off the driveshaft. Pull the impeller plate off the lower unit and slip it off the driveshaft. Remove the bearing carrier retaining bolts.
How do you break in a lower unit?
- Fill unit with manufacturer’s required gear oil to recommended level.
- Adjust RPM at idle to manufacturer’s specifications.
- Proper shift adjustment is essential.
- Jumping out of gear: If the unit will not stay in gear, the clutch dog has probably been rounded off.
How do you remove a Mercury 150 lower unit?
Look inside shallow cavity that’s exposed when the zinc drops away. Use the socket wrench, extender and 9/16-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.Are outboard lower units interchangeable?
If you are looking to replace your lower unit on your vintage Johnson/Evinrude outboard then eBay is a great place to find a good deal. … It is true that Johnson / Evinrude lower units can be interchanged however, you can’t rely on visual comparison alone.
What Mercury motor do I have?
Answer: Every Mercury outboard has a serial number label located on the transom bracket area of the engine. The latest serial number labels display a 2-digit number in a box at the lower right portion of the label. These digits coincide with the last two digits of the year in which the outboard was manufactured.
Where does the water come out on a Mercury outboard?
Water is inducted through the lower unit by a water pump impeller, and then forced upward to circulate throughout the powerhead, and eventually exits through the exhaust system.
What oil goes in an outboard lower unit?
You can use any brand of lubricant that has a grade designation of API GL5 SAE 80 or 90 weight. Make sure you do not mix different oil brands or weights. into the BOTTOM drain hole. Then slowly squeeze the bottle to force the oil into the lower unit.How do you test an outboard water pump?
How Do You Test an Outboard Water Pump? On many outboards, you can simply put on the muffs and start the engine. You should see a steady stream of water coming out of the holes on the top of the engine. However, some brands do pump out a stream, but it might not look steady.
What is a lower unit on an outboard?The lower unit (or “foot”) of your outboard motor is the bottom part that houses the prop and gear case. … The main keys to lower unit maintenance are keeping fishing line and other debris from getting wound in the prop, and changing your lower unit oil regularly.
Article first time published onHow do I know if my impeller is bad?
With a bad impeller, water can’t be pumped inside, overheating the engine. Signs of a bad boat impeller are either boat engine overheats when you try to accelerate, loss in impeller vanes flexibility, physical wear & tear like cracks in impeller vane roots, melted or worn of vanes.
What is inboard and outboard bearings?
The inboard side (non-drive end) bearing supports part of the radial load caused by the cantilevered impeller and is able to float axially to allow for thermal expansion of the shaft. The outboard side (drive end) bearing also supports the radial load, but it is fixed to keep axial shaft movement to a minimum.
