Removing the Lower Unit on a 1985 V4 Johnson 90HP Outboard Motor: A Comprehensive Guide

Introduction

Maintaining your outboard motor is essential for ensuring its longevity and optimal performance. One of the most important maintenance tasks involves removing the lower unit for inspection, repairs, or replacement. This article provides a step-by-step guide to safely and effectively remove the lower unit from a 1985 V4 Johnson 90HP outboard motor.

Before You Start:

• Gather the necessary tools, including a 13/16-inch socket and wrench, a 7/16-inch socket and wrench, a flathead screwdriver, and a drain pan.
• Ensure the motor is in the lowered position.
• Place the motor in neutral.
• Disconnect the battery.

Step-by-Step Approach:

1. Drain the Gear Lube:

• Locate the drain plug on the lower unit and place the drain pan beneath it.
• Remove the drain plug and allow the gear lube to drain completely.

2. Remove the Propeller:

• Insert the 13/16-inch socket and wrench onto the propeller nut.
• Loosen the nut and remove the propeller.

3. Disconnect the Shift Linkage:

• Locate the shift linkage on the back of the lower unit and disconnect it from the motor.

4. Remove the Upper Bolt:

• Locate the upper bolt on the lower unit and remove it using the 7/16-inch socket and wrench.

5. Remove the Lower Bolt:

• Locate the lower bolt on the lower unit and remove it using the 7/16-inch socket and wrench.

6. Lift the Lower Unit:

• Grip the lower unit firmly and lift it straight up and off the motor.

7. Inspect and Clean:

• Inspect the lower unit for any damage or wear.
• Clean the lower unit using a solvent and a brush.

8. Reassemble:

• Reverse the steps to reassemble the lower unit. Ensure all bolts are properly tightened.

Common Mistakes to Avoid:

• Overtightening the bolts: Do not overtighten the bolts as this can damage the threads.
• Not draining the gear lube: Failure to drain the gear lube can cause the lower unit to leak during removal.
• Attempting to remove the lower unit without disconnecting the shift linkage: This can damage the shift linkage.

Call to Action:

Removing the lower unit from a 1985 V4 Johnson 90HP outboard motor is a relatively straightforward process that can be accomplished with the right tools and precautions. By following the steps outlined in this guide, you can safely and effectively perform this maintenance task. Regular lower unit removal and inspection will extend the life of your motor and ensure its optimal performance.