Mercury Mariner 100HR Service Maintenance Kit 75hp 80hp 90hp 100 115HP Outboard

The Mercury Mariner 100-Hour Service Maintenance Kit is designed to provide all the necessary components for a thorough and effective maintenance routine on your outboard motor. This kit is suitable for 75hp, 80hp, 90hp, 100hp, and 115hp models. Regular servicing using this kit ensures optimal performance, longevity, and reliability of your engine. Below is a detailed list of the contents and instructions on how to use them.

Contents:

1. Oil Filter
2. Fuel Filter
3. Spark Plugs
4. Gearcase Lubricant
5. Engine Oil
6. Impeller Kit (including impeller, gaskets, and seals)
7. Thermostat
8. Anodes (if applicable)
9. Oil Drain Plug Gasket
10. Grease

Detailed Instructions:

1. Safety Precautions:

• Ensure the engine is turned off and cool to the touch.
• Disconnect the battery to prevent any accidental start-ups.

2. Oil Change:

• Removing Old Oil:
  • Remove the engine cowling.
  • Place a drain pan underneath the drain plug.
  • Unscrew the drain plug and allow the old oil to drain completely.
• Replacing the Oil Filter:
  • Remove the old oil filter.
  • Lubricate the gasket on the new oil filter with a small amount of new oil.
  • Screw on the new oil filter by hand until it is snug, then tighten it an additional three-quarters of a turn.
• Refilling with New Oil:
  • Reinsert and tighten the drain plug with a new gasket if provided.
  • Use a funnel to pour the new engine oil into the oil fill port. Refer to your manual for the correct type and quantity of oil.
  • Replace the oil cap and wipe away any spills.

3. Fuel Filter Replacement:

• Removing the Old Fuel Filter:
  • Locate the fuel filter and clamp off the fuel line to prevent spillage.
  • Remove the old fuel filter by loosening the clamps or unscrewing it, depending on your model.
• Installing the New Fuel Filter:
  • Install the new fuel filter in the correct orientation as indicated by the arrow on the filter.
  • Secure it with clamps and reattach the fuel line.

4. Spark Plugs:

• Removing the Old Spark Plugs:
  • Use a spark plug socket and ratchet to remove each spark plug.
  • Inspect the old plugs for wear and deposits.
• Installing New Spark Plugs:
  • Check the gap on the new spark plugs and adjust if necessary.
  • Screw in the new spark plugs by hand to avoid cross-threading, then tighten with a torque wrench to the specification in your manual.

5. Gearcase Maintenance:

• Draining Old Gearcase Lubricant:
  • Place a drain pan under the lower unit.
  • Remove the drain and vent plugs to allow the lubricant to drain completely.
• Refilling with New Gearcase Lubricant:
  • Using a gearcase lubricant pump, fill the lower unit from the bottom up until lubricant flows out of the vent hole.
  • Replace and tighten the vent plug, then the drain plug, ensuring no leaks.

6. Impeller Replacement:

• Accessing the Water Pump:
  • Remove the bolts securing the lower unit and carefully lower it to access the water pump.
• Replacing the Impeller:
  • Remove the water pump housing and old impeller.
  • Install the new impeller, gaskets, and seals from the kit.
  • Reassemble the water pump housing and reattach the lower unit.

7. Thermostat:

• Removing the Old Thermostat:
  • Locate the thermostat housing and remove the bolts.
  • Remove the old thermostat and gasket.
• Installing the New Thermostat:
  • Place the new thermostat and gasket into the housing.
  • Reassemble the housing and secure it with bolts.

8. Anodes:

• Inspection and Replacement:
  • Inspect all anodes for wear and replace them if more than 50% corroded.
  • Install new anodes where necessary, ensuring they are securely fastened.

9. Greasing:

• Lubricating Moving Parts:
  • Apply marine-grade grease to all moving parts and fittings as specified in the service manual.

10. Final Checks:

• Reassemble and Test:
  • Reassemble any parts that were removed.
  • Reconnect the battery.
  • Start the engine and check for any leaks or abnormalities.
  • Perform a water test to ensure everything functions correctly.

By following these detailed instructions and using the components included in your Mercury Mariner 100-Hour Service Maintenance Kit, you can maintain your outboard motor in peak condition, ensuring reliable performance and extending its lifespan