Table of Contents
The Subaru WRX is known for its impressive performance, but with the right modifications, you can unlock even more horsepower. One effective way to achieve this is by installing a Multi-Layer Steel (MLS) head gasket. This article will guide you through the process of installing an MLS head gasket in a turbocharged Subaru WRX, which can lead to a significant horsepower increase of 50 or more.
Understanding MLS Head Gaskets
Before diving into the installation process, it’s essential to understand what an MLS head gasket is and how it benefits your engine. An MLS head gasket is designed with multiple layers of steel, providing better sealing and resistance to higher pressures and temperatures compared to traditional gaskets.
- Improved sealing capabilities
- Enhanced durability under high performance
- Better resistance to blowouts
Tools and Materials Needed
Gathering the right tools and materials is crucial for a successful installation. Here’s a list of what you will need:
- MLS head gasket
- Torque wrench
- Socket set
- Ratchet
- Engine hoist (if necessary)
- Gasket scraper
- Clean rags
- Engine oil
Preparation Steps
Before you start the installation, proper preparation is key to ensuring everything goes smoothly. Follow these steps:
- Ensure the engine is cool before starting the work.
- Disconnect the battery to avoid any electrical issues.
- Drain the engine coolant and oil.
- Remove any components obstructing access to the head, such as the intake manifold and turbocharger.
Removing the Old Head Gasket
Now that everything is prepared, it’s time to remove the old head gasket. Follow these steps carefully:
- Unbolt the cylinder head using the correct sequence to prevent warping.
- Carefully lift the cylinder head off the engine block.
- Inspect the old head gasket for damage and note any signs of failure.
- Use a gasket scraper to remove any remnants of the old gasket from the cylinder head and block.
Installing the MLS Head Gasket
With the old gasket removed, it’s time to install the new MLS head gasket. Follow these steps:
- Clean the surfaces of the cylinder head and engine block thoroughly.
- Place the new MLS head gasket onto the engine block, ensuring it aligns correctly with the bolt holes.
- Carefully position the cylinder head back onto the engine block.
Tightening the Cylinder Head Bolts
Properly tightening the cylinder head bolts is crucial for a successful installation. Follow the torque specifications provided by Subaru:
- Start by hand-tightening all bolts to ensure they are seated correctly.
- Using a torque wrench, tighten the bolts in the specified sequence.
- Follow the recommended torque settings, usually in stages (e.g., 30 ft-lbs, then 60 ft-lbs, and finally to the final torque).
Reassembling the Engine
After the head gasket is installed and torqued, it’s time to reassemble the engine:
- Reinstall any components that were removed, such as the intake manifold and turbocharger.
- Reconnect the battery and fill the engine with new oil and coolant.
- Double-check all connections to ensure nothing is loose.
Testing Your Installation
Once everything is reassembled, it’s vital to test your installation:
- Start the engine and let it idle for a few minutes.
- Check for any leaks around the head gasket area.
- Monitor engine temperature to ensure it’s operating within normal limits.
Conclusion
Installing an MLS head gasket in your turbocharged Subaru WRX can lead to a significant horsepower increase and improved engine performance. By following this guide, you can ensure a successful installation that maximizes your vehicle’s potential. Always remember to perform regular maintenance and check for any signs of wear or damage to keep your Subaru running at its best.