Should be 2 screws. One toward the top, near the motor and one on bottom, near the prop. Open both to drain. Fill from bottom until it reaches top screw hole. Boat/ outdoor shops will have the proper oil and pump to use.
Use the recommended OIL. Do once a year. Dispense properly.
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
Never mind I figured it out
To rebuild a lower unit on a 40hp Mercury outboard, start by removing the lower unit from the engine by unscrewing the bolts and disconnecting the shift linkage. Drain the gear oil and disassemble the lower unit, noting the arrangement of parts. Replace worn components such as seals, bearings, and the water pump, then reassemble the unit, ensuring all parts are properly aligned. Finally, refill with the appropriate gear oil and reinstall the lower unit on the outboard.
For a Johnson outboard, the lower unit typically requires a high-quality marine gear oil rather than grease. It's essential to use a product specifically designed for outboard lower units, such as 80W-90 or 75W-90 gear oil, depending on the manufacturer's specifications. Always consult the owner's manual for the correct type and viscosity to ensure optimal performance and longevity of the lower unit.
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
For a Mercury outboard motor's lower unit, it's essential to use a high-quality marine gear oil specifically designed for outboard motors, such as Mercury High-Performance Gear Lube or an equivalent. These lubricants offer excellent protection against corrosion, water intrusion, and wear under high-stress conditions. Always check the owner's manual for the specific type and viscosity recommended for your particular model.
Take it to a marine repair shop or google it up, the answer is there
No
It is a speedometer pick up tube.no longer used due to clogging.
For a 90hp Mercury two-stroke outboard, you should use a high-quality lower unit gear lube specifically designed for outboard motors. Mercury recommends using their own brand of gear lube, such as Mercury High-Performance Gear Lube or Quicksilver Gear Lube, which offer excellent protection against wear and corrosion. Always check the owner's manual for specific recommendations regarding viscosity and any additional requirements.
Mercury® Marine High-Performance Gear Lube from Basspro