Highlights
- Here’s a step-by-step guide to help you change the gear oil in your Mercury outboard.
- Insert the funnel into the oil fill hole on the upper part of the lower unit.
- Changing gear oil in your Mercury outboard is a relatively simple task that can be completed in less than an hour.
Maintaining your Mercury outboard‘s gear oil is crucial for its longevity and performance. Regular oil changes help prevent wear and tear on internal components, ensuring smooth shifting and optimal engine operation. Here’s a step-by-step guide to help you change the gear oil in your Mercury outboard:
Gather Necessary Tools and Materials
- New gear oil (refer to your outboard’s user manual for the recommended type and quantity)
- Oil drain pan
- Funnel
- Ratchet with socket
- Rags or paper towels
Safety Precautions
- Allow the engine to cool down before starting any work.
- Wear gloves and safety glasses to protect yourself from hot oil and debris.
- Work in a well-ventilated area.
Step 1: Locate the Drain Plug
- Identify the gear oil drain plug on the lower unit of the outboard. It is usually located on the bottom or side of the unit.
Step 2: Drain the Old Oil
- Place the oil drain pan under the drain plug.
- Use the ratchet and socket to carefully loosen the drain plug.
- Allow the old oil to drain into the pan.
- Clean the drain plug and its threads with a rag.
Step 3: Remove the Vent Screw
- Locate the vent screw on the upper part of the lower unit. It is usually smaller than the drain plug.
- Use the ratchet and socket to remove the vent screw.
- Allow any remaining oil to drain out through the vent hole.
Step 4: Install the Vent Screw
- Clean the vent screw and its threads with a rag.
- Apply a small amount of thread sealant to the threads.
- Install the vent screw back into its hole and tighten it securely.
Step 5: Fill with New Oil
- Insert the funnel into the oil fill hole on the upper part of the lower unit.
- Pour the recommended amount of new gear oil into the funnel.
- Fill the unit until oil begins to flow out of the vent hole.
Step 6: Replace the Drain Plug
- Clean the drain plug and its threads with a rag.
- Apply a small amount of thread sealant to the threads.
- Install the drain plug back into its hole and tighten it securely.
Step 7: Check Oil Level
- Reinstall the vent screw.
- Start the engine and let it run for a few minutes.
- Shift through all gears to circulate the new oil.
- Stop the engine and check the oil level again through the vent hole.
- If the oil level is below the vent hole, add more oil until it reaches the proper level.
Wrapping Up
Changing gear oil in your Mercury outboard is a relatively simple task that can be completed in less than an hour. By following these steps, you can ensure your outboard’s gearcase is properly lubricated and protected, extending its lifespan and performance.
FAQ
Q: How often should I change the gear oil in my Mercury outboard?
A: Refer to your outboard’s user manual for the recommended oil change interval, which typically ranges from 100 to 200 hours of operation or annually.
Q: What type of gear oil should I use in my Mercury outboard?
A: Use a high-quality marine gear oil that meets the specifications recommended in your outboard’s user manual.
Q: Can I use regular motor oil in my outboard’s gearcase?
A: No, regular motor oil is not suitable for use in outboard gearcases. It does not provide the necessary lubrication and protection for the metal components.
