Subaru Impreza Legacy EJ20D 2.0L H4 Engine 2000-2002

Description

Drivers struggle with blown cylinder head gaskets and crankshaft bearing knock inside aged boxer platforms. The Subaru Impreza EJ20D Remanufactured Engine restores all-wheel-drive power and original boxer exhaust cadence. Displacing 2.0L across opposed 4-Cylinder banks, this 16-Valve DOHC long block features S20 cylinder heads. Technicians must verify disc-shim valve lash clearances before final intake manifold installation.

Die-cast aluminum alloy forms the horizontally split crankcase halves marked EJ20 and 20L/S20CL on the right front top casing. Dual S20 aluminum cylinder heads house 16 valves driven by dual overhead camshafts with disc-shim bucket lifters. Dry engine mass measures 217 lbs. Packaging dimensions span 36in length, 36in width, and 36in height, with the lower steel oil pan holding 4.2 quarts of motor oil.

Key Features of Subaru EJ20D

Professional technicians buy Subaru Impreza EJ20D remanufactured engine assemblies to eliminate chronic oil leaks and restore boxer engine power. This precision-machined long block replaces tired powertrains in Japanese domestic market and export all-wheel-drive sedans.

• Opposed cylinder boxer block layout cancels internal vibration forces to promote smooth rotational power.
• Dual S20 crossflow aluminum cylinder heads restore combustion chamber volumetric efficiency across all cylinders.
• Pre-installed timing belt, guide pulleys, and tensioner eliminate valvetrain timing errors during installation.
• New water pump assembly arrives bolted to the front engine case to accelerate installation turnaround.
• Align-honed split crankcase main saddles guarantee precise bearing crush and hydrodynamic journal support.
• Upgraded multi-layer steel head gaskets seal combustion pressures and prevent coolant gallery migration.
• Disc-shim bucket lifters control valve lash stability across high engine RPM operating conditions.

Boxer Engine Dynamometer Performance Data

Dynamometer cell loading verifies 155HP at 6,400 RPM and 145 ft-lbs torque at 3,200 RPM on unleaded gasoline. Crankshaft main journal runout measures within 0.0003in TIR along induction-hardened boxer journals. Connecting rod oil clearances hold steady at 0.0013in to ensure hydrodynamic bearing protection under peak acceleration. Operating oil pressure registers 55 PSI at 3,000 RPM with coolant stabilized at 190°F. Cylinder compression tests record 185 PSI across all four opposed cylinders, confirming uniform piston ring seating and valve guide concentricity.

Vehicle Fitment Drivetrain Guide

This EJ20D long block fits 2000 to 2002 Subaru Impreza and Legacy models built between September 2000 and May 2002. The rear engine bellhousing pattern mates with Subaru 5-Speed manual and 4-Speed automatic all-wheel-drive transaxles. Casting identification S20 matches right and left cylinder heads. This engine does not fit 2003 and later Impreza models with shimless bucket lifters, single-cam EJ22 chassis, or rear-wheel-drive BRZ platforms.

Installation Protocol Maintenance Schedules

Pedestal cable throttle linkages require 6 lbs tension for smooth throttle plate sweep without binding. Mechanics must purge air pockets from the cooling system to prevent localized cylinder head hot spots. Never install this naturally aspirated long block in high-boost WRX turbo builds exceeding stock manifold pressures or non-vented track chassis.

• Drain break-in motor oil and install a fresh oil filter after 500 road miles.
• Inspect timing belt deflection and drive belt tension every 15,000 driving miles.
• Replace engine oil and filter every 3,000 miles using 5W-30 viscosity motor oil.

Warranty Terms Core Return Policy

Warranty terms provide a 3-Year Unlimited-Mile limited warranty covering all internal lubricated engine rotating components. Return your like-for-like core within 30 days using the prepaid freight bill to secure core deposit refund. The crated package contains the complete long block, timing components, water pump, and installation manuals.