17117639020 – BMW Screw Cap for Expansion Tank Replacement

The BMW screw cap for the expansion tank (part number 17117639020) is a crucial component in your vehicle’s cooling system. It ensures a secure seal for the expansion tank, maintaining the correct pressure and preventing coolant leaks. This helps to keep the engine at an optimal temperature, ensuring reliable performance and longevity.

Specifications

BMW Screw Cap for Expansion Tank (Part Number: 17117639020)

Features and Technical Specifications:

• Part Description: Screw Cap for Expansion Tank
• Manufacturer: BMW
• Part Number: 17117639020
• Weight: 0.40 pounds
• Replaces: 17-11-7-521-071

Materials:

• Made from high-quality, durable materials to ensure a secure and tight seal, preventing any leakage of coolant or steam.

Dimensions:

• Specific dimensions are not typically listed, but it is designed to fit seamlessly with the compatible BMW models.

Compatibility:

• 1 Series: 2011 BMW 1 Series M Coupe (E82), 2008-2013 BMW 128i, 2008-2013 BMW 135i
• 2 Series: 2014-2016 BMW 228i, 2015-2016 BMW 228i xDrive, 2017-2020 BMW 230i, 2017-2020 BMW 230i xDrive
• 3 Series: 2006-2011 BMW 323i, 2013-2018 BMW 320i, 2013-2018 BMW 320i xDrive
• 5 Series: 2008-2011 BMW 528i, 2008-2013 BMW 535i
• X Series: 2011-2020 BMW X3, 2009-2020 BMW X5
• Others: Various models including BMW 325i, 328i, and more.

This part is a direct replacement and ensures reliability and performance as per BMW’s standards.

Installation Process

Here’s a step-by-step guide to install the BMW screw cap for the expansion tank (part number 17117639020):

1. Ensure Safety: Make sure the engine is cool before starting. This prevents burns from hot coolant.

2. Locate the Expansion Tank: Open the hood and locate the expansion tank. It’s usually a translucent plastic tank near the radiator.

3. Remove the Old Cap: Turn the old cap counterclockwise to remove it. If it’s stuck, use a cloth for better grip.

4. Inspect the Tank: Check the expansion tank for any cracks or damage. Ensure the coolant level is appropriate.

5. Install the New Cap: Place the new screw cap on the expansion tank. Turn it clockwise until it’s snug. Do not over-tighten.

6. Check for Leaks: Start the engine and let it run for a few minutes. Check around the cap for any leaks.

7. Close the Hood: Once everything is secure and there are no leaks, close the hood.

You’re all set!

Maintenance Tips

Here are some maintenance tips and best practices for the BMW screw cap for the expansion tank (part number 17117639020):

1. Regular Inspection: Check the cap for any signs of wear, cracks, or damage. Replace immediately if any issues are found.
2. Cleanliness: Keep the cap and surrounding area clean to prevent debris from entering the cooling system.
3. Proper Tightening: Ensure the cap is securely tightened to the recommended torque specification to prevent leaks.
4. Lubrication: Apply a light coat of silicone grease to the rubber seal to maintain its flexibility and ensure a good seal.
5. Temperature Monitoring: Avoid exposing the cap to extreme temperatures to prevent material degradation.
6. Replacement: Follow the manufacturer’s recommended replacement intervals to ensure optimal performance.

These practices will help maintain the longevity and performance of your BMW expansion tank screw cap.

Common Issues and Solutions

Here are some common issues with the BMW screw cap for the expansion tank (part number 17117639020) and practical solutions:

1. Leakage:

   • Issue: The cap may not seal properly, leading to coolant leaks.
   • Solution: Ensure the cap is tightened correctly. If the problem persists, inspect the cap for cracks or damage and replace it if necessary.

2. Pressure Build-Up:

   • Issue: The cap may fail to maintain the correct pressure, causing overheating.
   • Solution: Regularly check the cap’s pressure rating and replace it if it no longer maintains the required pressure.

3. Wear and Tear:

   • Issue: Over time, the cap’s gasket can wear out, leading to a poor seal.
   • Solution: Inspect the gasket for signs of wear and replace the cap if the gasket is damaged.

4. Compatibility Issues:

   • Issue: Using an incorrect cap can lead to improper sealing and pressure issues.
   • Solution: Always use the correct part number (17117639020) for your specific BMW model to ensure proper fit and function.

5. Contamination:

   • Issue: Dirt and debris can accumulate on the cap, affecting its performance.
   • Solution: Regularly clean the cap and the surrounding area to prevent contamination.

By addressing these issues proactively, you can ensure the longevity and proper functioning of your BMW’s cooling system. If you encounter persistent problems, consulting a professional mechanic is always a good idea.

The BMW Screw Cap for Expansion Tank

The BMW screw cap for the expansion tank (part number 17117639020) is a crucial component in maintaining your vehicle’s cooling system. It ensures a secure seal, preventing coolant leaks and keeping the engine at an optimal temperature.

This part is designed to fit seamlessly with compatible BMW models, including various series such as:

• 1 Series
• 2 Series
• 3 Series
• 5 Series
• X Series
• and others

Regular inspection, cleanliness, proper tightening, lubrication, and temperature monitoring are essential for maintaining its longevity and performance.

Addressing common issues like:

• Leakage
• Pressure build-up
• Wear and tear
• Compatibility problems
• Contamination

can be resolved by following the manufacturer’s guidelines and consulting a professional mechanic if needed.