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
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
No
It is a speedometer pick up tube.no longer used due to clogging.
first of all what oil your are talking about , i hope not engine oil because there is non that is two stroke engine. lower unit has a draining bolt on the bottom and air or fill bolt on the top of the lower unit....
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
Using Valvoline 75W-90 synthetic oil in the lower unit of a Mercury outboard is generally not recommended unless it meets the manufacturer's specifications. Mercury typically specifies its own gear lube, often requiring a specific type such as Mercury High-Performance Gear Lube or a similar product. Always consult your owner's manual for the correct type of oil to ensure optimal performance and to maintain warranty coverage.
pwd 40
To change the reverse lock on a Mercury Outboard, you typically need to access the shift shaft assembly connected to the lower unit. This involves removing the gearcase and disconnecting the shift rod from the reverse lock actuator. Then, you can replace or adjust the reverse lock mechanism as needed before reassembling the gearcase. It's recommended to consult the service manual for your specific outboard model for detailed instructions.