This guide delves into the intricacies of the reverse lockdown spring on a 20 HP Johnson outboard motor, a crucial component for safe and reliable operation. We'll cover troubleshooting common issues, identifying the spring itself, and the process of replacing it. This information is applicable to various Johnson outboard models within the 20 HP range, but always consult your specific owner's manual for detailed diagrams and specifications.
What is the Reverse Lockdown Spring?
The reverse lockdown spring is a vital part of your outboard's shift mechanism. Its purpose is to securely lock the gears in reverse, preventing accidental shifting out of gear while underway. This is critical for safety, preventing damage to the engine and ensuring smooth operation. A faulty spring can lead to unpredictable shifting, potentially causing dangerous situations.
How Do I Know If My Reverse Lockdown Spring is Broken?
Several symptoms indicate a problem with your 20 HP Johnson's reverse lockdown spring:
- Reverse gear slips out: The most obvious sign is the reverse gear disengaging unexpectedly while in reverse, requiring constant manual engagement.
- Difficulty engaging reverse: You might experience unusual resistance or difficulty shifting into reverse.
- Clunking or grinding noises: Strange noises from the lower unit while shifting suggest a problem within the gear mechanism, possibly related to the spring's malfunction.
- Inconsistent shifting: Sporadic and unreliable shifting, where the gear sometimes engages correctly and other times doesn't, points toward a mechanical issue like a worn or broken spring.
How Do I Access the Reverse Lockdown Spring?
Accessing the reverse lockdown spring requires disassembling parts of your outboard's lower unit. This is a moderately advanced repair and should only be undertaken if you have mechanical experience and the necessary tools. Improper disassembly can cause further damage. The exact procedure varies slightly depending on the specific year and model of your 20 HP Johnson. Always refer to a service manual specific to your outboard motor. Generally, this will involve:
- Removing the lower unit: This often involves disconnecting linkages, fuel lines, and potentially the propeller.
- Disassembling the shift mechanism: This step requires careful removal of various components to expose the spring.
- Identifying the spring: The spring itself is usually a relatively small, but strong, component within the shift mechanism. Its precise location varies depending on the model.
How Do I Replace the Reverse Lockdown Spring?
Replacing the reverse lockdown spring is a delicate procedure. Here are general steps; however, always consult your service manual for precise instructions relevant to your outboard model.
- Careful removal of the old spring: Take note of how the spring is positioned and oriented to ensure correct reassembly.
- Installation of the new spring: Carefully install the new spring, ensuring it is correctly seated and positioned. Again, your service manual will provide crucial details here.
- Reassembly of the shift mechanism: Reassemble the shift mechanism meticulously, following the reverse order of disassembly.
- Reinstallation of the lower unit: Connect all linkages and ensure everything is securely fastened.
- Testing: After reassembly, test the shifting mechanism thoroughly to confirm proper operation.
Where Can I Find a Replacement Reverse Lockdown Spring?
Replacement reverse lockdown springs for 20 HP Johnson outboards can typically be found at:
- Authorized Johnson/Evinrude dealers: These dealers are your best source for genuine parts.
- Online marine parts suppliers: Numerous online retailers specialize in outboard parts.
- Local marine supply stores: Your local marine supply store may stock common parts like this spring.
What are some common causes of reverse lockdown spring failure?
Several factors can contribute to the failure of a reverse lockdown spring:
- Age and wear: Over time, the spring can simply wear out due to repeated use and exposure to the elements.
- Corrosion: Saltwater exposure can accelerate corrosion, weakening the spring.
- Improper maintenance: Neglecting regular maintenance can allow corrosion and other issues to develop.
- Accidental damage: The spring may be damaged during accidents or improper handling of the outboard.
This guide provides general information; always consult your owner's manual and, if needed, a qualified marine mechanic for specific instructions and safety precautions. Remember, working on an outboard motor requires mechanical aptitude and safety consciousness. Improper repair could lead to damage or injury.
