A stripped windshield wiper arm happens when the splines wear down, causing the wipers to malfunction. It’s often due to corrosion or overuse. Replacing the arm or post usually fixes the issue.
A car’s windshield wipers are critical for visibility and safety during inclement weather. However, a malfunctioning wiper can turn driving in rain or snow into a hazardous ordeal. One of the common issues that car owners face is a stripped windshield wiper arm, which can render the entire wiper system useless.
In this detailed guide, we will explore what it means when a wiper arm is stripped, the causes, how to fix it, and preventive measures.
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What Does Windshield Wiper Arm Stripped Mean?
The term “stripped” refers to the damage or wear on the splines (the ridged teeth-like structure) inside the wiper arm or on the motor post that engages with it. These splines allow the wiper arm to be securely mounted and rotate in sync with the wiper motor. When either the splines on the arm or the post become worn down or rounded, the wiper arm loses grip, which results in:
- Slipping or loose movement.
- Wipers moving out of sync with each other.
- Complete failure of the wipers to move.
The most obvious symptom of a stripped wiper arm is that your wipers won’t wipe the windshield effectively, or they will operate inconsistently. Sometimes, only one wiper will stop working, while the other may still function.
Causes of a Stripped Windshield Wiper Arm
A stripped wiper arm can occur due to several reasons. Here are the most common causes:
1. Corrosion and Wear Over Time
Over time, water, road salt, and debris can cause corrosion and rust on the wiper arm or the post. As rust builds up, it weakens the metal splines, which can eventually lead to stripping.
2. Over-Tightening or Under-Tightening the Nut
If the nut securing the wiper arm to the post is over-tightened, it can cause the splines on the arm or the post to wear down prematurely. Similarly, if the nut is not tight enough, the wiper arm can wobble, gradually wearing down the splines until they strip.
3. Heavy Snow or Ice
Trying to use windshield wipers to clear heavy snow or ice from the windshield can strain the wiper arm. The wipers are not designed to handle this kind of weight, and forcing them through snow can strip the splines or damage the motor linkage.
4. Old or Poor Quality Components
If the wiper arm or post is made from low-quality material, or if it’s simply old, it is more prone to wear and stripping. Over time, even regular use can weaken the materials and cause them to fail.
5. Accidental Mishandling
If someone manually forces the wiper arm up or down (e.g., during cleaning or maintenance), it can misalign the splines or cause damage, especially if done forcefully.
How to Fix a Stripped Windshield Wiper Arm
Once the wiper arm is stripped, you will need to address the issue promptly to restore the functionality of your wipers. Here’s how to fix a stripped windshield wiper arm:
1. Inspect the Wiper Arm and Post
Before fixing anything, it’s crucial to determine whether the splines on the wiper arm or the splined post (wiper motor shaft) are stripped. To do this:
- Remove the wiper arm: This is usually done by removing the nut that holds the arm to the motor shaft.
- Inspect the splines on both the arm and post. If the splines on the post are stripped, you will need to replace the motor shaft or post. If the splines inside the wiper arm are stripped, the arm will need replacement.
2. Replacing the Wiper Arm
If the wiper arm’s splines are damaged:
- Purchase a replacement wiper arm. Ensure the new arm matches the make and model of your vehicle.
- Replace the new wiper arm by aligning it on the splined post and tightening the securing nut. Be sure not to overtighten to avoid future stripping.
3. Replacing the Wiper Motor Shaft
If the motor shaft is stripped:
- You’ll likely need to replace the wiper linkage or motor assembly. This job can be more complex and may require professional assistance.
- Remove the old motor and linkage and replace them with new parts. Ensure all connections are tight and secure before testing.
4. Testing the Wipers
Once you’ve replaced the necessary components, test the wipers by turning them on. Make sure they are moving smoothly and wiping the windshield effectively. If the wipers are still malfunctioning, double-check the alignment and tightness of the wiper arm and post.
5. Using Temporary Fixes
If you’re not able to replace the wiper arm immediately, you can try a temporary fix by wrapping a small amount of aluminum foil around the splined post to help the wiper arm grip it. However, this is only a stop-gap measure and should not be relied on for the long term.
Preventing Windshield Wiper Arm Stripping
Prevention is always better than a cure. Here are some tips to avoid stripping your windshield wiper arms:
- Regularly inspect your wipers and linkage: Check for wear, rust, or loose nuts on the wiper assembly. Tighten any loose connections promptly.
- Clear the windshield manually: Don’t use your wipers to move heavy snow or ice. Always clear these manually before turning the wipers on.
- Replace wiper arms periodically: Like most mechanical components, wiper arms are not designed to last forever. Replacing them every few years can help prevent stripping and other issues.
- Use high-quality parts: When replacing wiper components, opt for high-quality, durable parts to avoid premature wear.
Frequently Asked Questions
Here are some FAQs about windshield wiper arm stripping –
1. How can I tell if my windshield wiper arm is stripped?
You can tell your wiper arm is stripped if the wipers don’t move, move unevenly, or stop partway through the windshield. Upon inspection, you may see wear or rounded-off splines where the wiper arm connects to the post.
2. Can I drive with a stripped wiper arm?
It is not advisable to drive with a stripped wiper arm, especially in bad weather. A malfunctioning wiper can severely limit your visibility, putting you and others at risk.
3. Can I fix a stripped wiper arm myself?
Yes, if you’re comfortable working on your car, you can replace a stripped wiper arm yourself. However, if the motor shaft is stripped, it may require more technical work or professional assistance.
4. How much does it cost to fix a stripped wiper arm?
The cost varies depending on the vehicle and whether the motor shaft is damaged. A replacement wiper arm can cost between $20 and $100, while replacing the wiper motor or linkage can run $150 to $400, including labor.
5. How long should windshield wiper arms last?
With proper care and regular maintenance, wiper arms should last around 5 to 10 years. However, extreme weather conditions, rust, and misuse can shorten their lifespan.
Conclusion
A stripped windshield wiper arm is a relatively common but fixable issue. By understanding the causes and knowing how to inspect and replace the necessary components, you can restore your wiper system and drive safely in all weather conditions. Regular maintenance and preventive measures can also help ensure your wiper arms last longer without succumbing to wear or stripping.