Subaru EJ Rear Main Seal Installer Tool – Fits EJ205 EJ255 EJ257 EJ253 Engines

Install your Subaru EJ-series rear main (crankshaft) seal straight, evenly, and to the correct depth with this bolt-on press tool. Designed to use the flywheel/flexplate bolt pattern, it applies uniform pressure across the seal—eliminating hammering, preventing misalignment, and reducing the chance of leaks or rework.

Perfect for clutch jobs, engine reseals, and rebuilds, this tool delivers consistent, professional results for both DIY users and shop environments.

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Key Features

• Designed for Subaru EJ-series engines
• Uses factory flywheel/flexplate bolt pattern for even pressure
• Helps ensure square, aligned seal installation
• Reduces risk of seal damage, uneven seating, and leaks
• Eliminates need for hammering or improvised tools
• Ideal for engine builds, clutch replacements, and maintenance
• Durable, reusable construction

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Compatibility

(Verify engine code and seal size before purchase)

Fits many Subaru EJ engines including:

• EJ205 – 2.0L WRX
• EJ255 / EJ257 – 2.5L WRX / STI
• EJ253 – 2.5L naturally aspirated

Common vehicles include:

• Subaru Impreza / WRX / STI
• Subaru Forester
• Subaru Legacy
• Subaru Outback

Many EJ engines share the same rear main seal family, but always confirm fitment by engine code and measurements.

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How to Use

1. Install the new rear main seal by hand to start
2. Position the tool over the crank flange
3. Bolt the tool using factory flywheel/flexplate bolts
4. Tighten bolts gradually in a cross pattern
5. Continue until the seal is fully seated evenly

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What’s Included

• 1 × Rear Main Seal Installer / Press Tool
  (Hardware not included – reuse OEM bolts)

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Material & Notes

• Durable 3D printed construction (PETG or PLA+)
• Reusable for multiple installations
• Aftermarket tool — not OEM Subaru
• Color may vary from photos
• Always verify seal size and engine compatibility before purchase

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Why Use a Press Tool

Improper rear main seal installation is a common cause of leaks. This tool ensures even pressure and correct alignment, helping you achieve a reliable, leak-free install every time.