How to Put a Subaru WRX Engine: A Comprehensive Guide

If you’re a Subaru WRX owner, you know that the engine is one of the most critical components of your vehicle. Sometimes, the engine might need to be replaced or upgraded, and that is where this guide comes in handy. In this guide, we will take you through the steps involved in putting a Subaru WRX engine. We will go into detail to ensure that you understand every step and make the whole process easy for you.

Key Takeaways

  • Replacing or upgrading your Subaru WRX engine requires a lot of time and attention to detail.
  • You need the right tools, equipment, and a suitable working space to put a Subaru WRX engine correctly.
  • You must detach the old engine before installing the new one.
  • It’s essential to keep track of all the parts and connections, labeling them for easy identification.
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Tools and Equipment

Before you start putting a Subaru WRX engine, you need to gather all the necessary tools and equipment. The tools and equipment you will need include:

  • A hoist or crane
  • Jack stands
  • Socket set
  • Wrench set
  • Screwdrivers
  • Pliers
  • Oil drain pan
  • Engine hoist leveler
  • Engine stand
  • Shop towels

Step-by-Step Guide: How to Put a Subaru WRX Engine

Follow the steps below to put a Subaru WRX engine:

Step 1: Disconnect the Battery and Drain the Oil

Before you start working on the engine, you must disconnect the battery and drain the oil. Open the hood and locate the battery. Disconnect the negative terminal using a wrench. Next, locate the oil drain plug and drain the oil into a pan.

Step 2: Detach the Exhaust System

Use a socket set to remove the bolts securing the exhaust to the manifold. Detach the exhaust system and set it aside.

Step 3: Remove the Radiator and Fans

Unscrew the bolts holding the radiator in place and detach it. Use a socket set to remove the bolts holding the fans in place and set them aside.

Step 4: Disconnect the Fuel Lines and Wiring Harnesses

Locate the fuel lines and disconnect them using pliers. Next, locate the wiring harnesses and unplug them.

Step 5: Detach the Transmission and Driveshaft

Use a wrench and socket set to detach the transmission from the engine. Next, remove the driveshaft.

Step 6: Remove the Engine

Attach the hoist or crane to the engine and lift it out of the engine bay. Make sure to lift the engine straight up and out, avoiding any contact with other parts or the car’s body.

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Step 7: Clean the Engine Bay

Before installing the new engine, clean the engine bay using shop towels. Remove any debris, oil stains, or dirt.

Step 8: Install the New Engine

Lower the new engine into the engine bay using the hoist or crane. Make sure to align the engine with the mounts correctly. Once you have the engine in place, reattach the transmission, driveshaft, fuel lines, and wiring harnesses.

Step 9: Install the Radiator and Fans

Attach the fans and radiator to the engine using the bolts. Connect any hoses and wiring harnesses that were removed.

Step 10: Attach the Exhaust System

Reattach the exhaust system to the manifold using the bolts.

Step 11: Fill the Engine with Oil and Reconnect the Battery

Refill the engine with oil and attach the battery’s negative terminal using a wrench.

Step 12: Start the Engine and Check for Leaks

Start the engine and let it run for a few minutes. Check for any leaks or unusual noises.


Putting a Subaru WRX engine requires a lot of time, effort, and attention to detail. With the right tools and equipment, you can replace or upgrade your engine successfully. Don’t forget to label all the parts and connections and keep track of them. With this guide, you should be able to put a Subaru WRX engine with ease.


How long does it take to put a Subaru WRX engine?

Replacing a Subaru WRX engine takes approximately 10-12 hours, depending on your skill level and experience.

Can I put a different engine in my Subaru WRX?

Yes, you can install a different engine in your Subaru WRX, but you must ensure that it’s compatible with your car and meets all the necessary performance requirements.

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What are the signs that I need to replace my Subaru WRX engine?

Some of the signs that you need to replace your Subaru WRX engine include excessive smoke, knocking noises, reduced power, and high oil consumption.

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Billy Covington

With a passion for all things automotive, Billy is our go-to expert on Subaru performance upgrades and modifications. He's been featured in several car magazines and blogs, and his extensive knowledge and expertise make him a valuable member of our team. When he's not working on cars, he enjoys playing guitar and writing music.

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