Eliminate variable valve timing rattle and chronic oil consumption by installing this Mazda 3 2.3L Remanufactured Engine long block assembly. Engineered for automatic transmission passenger vehicles, this 2.3L 4-Cylinder 16-Valve DOHC powertrain restores factory compression. A critical trade-off demands manual oil gallery priming and timing chain tensioner pin inspection before initial startup to protect dry overhead cam bearings.

Cast aluminum engine block features foundry casting designation T5251 with cast iron cylinder sleeves. The DOHC aluminum cylinder head features variable cam timing and a 5-tooth reluctor wheel on the intake camshaft. Crated envelope dimensions measure 36in length by 36in width by 36in height with an engine weight of 275 lbs. Rotating components feature crankshaft casting 1L5G-BF or 3L5G-DA, powdered metal rods, and a 4.5-quart oil pan.

Key Features of Mazda 2.3L

Automotive service centers buy Mazda 2.3L remanufactured engine assemblies to restore commuter fuel economy and eliminate chronic oil burning. This long block stops piston ring blowby while maintaining smooth variable valve timing response across all 4 cylinders.

- Aluminum block decks receive CNC milling to Ra 20 finish to seal multi-layer steel gaskets
- Diamond plateau honed cylinder bores seat piston rings within 500 miles to stop oil burning
- Micro-polished crankshaft journals hold 0.0003in TIR runout to safeguard connecting rod bearings
- Align-honed main bearing saddles maintain 0.0012in clearance to support hydrodynamic oil film pressure
- Intake camshaft features a 5-tooth reluctor wheel to deliver precise variable cam timing signals
- Multi-layer steel head gaskets resist thermal expansion between aluminum castings under load
- Remanufactured 16-Valve cylinder heads feature valve seats cut to 0.001in concentricity for tight seal

Dyno Load Precision Machining Tolerances

Automated dyno spin testing verifies 160 HP output at 6,500 RPM and 150 ft-lbs torque at 4,500 RPM under operational conditions. Machine shop tolerances mandate crankshaft journal runout below 0.0003in TIR and connecting rod bearing oil clearances at 0.0012in. Plateau-honed cylinder walls deliver uniform compression between 180 PSI and 185 PSI across all 4 combustion chambers. Hot engine oil pressure measures 55 PSI at 3,000 RPM while regulated coolant operating temperatures maintain 190°F to verify water jacket flow integrity.

Vehicle Fitment Drivetrain Guide

This remanufactured long block fits 2004 to 2005 Mazda 3 and 2006 to 2007 Mazda 5 models powered by the 2.3L 2260cc DOHC 16-Valve L4 engine with block casting T5251. Designed for automatic transmission front-wheel drive configurations with intake variable cam timing. Fitment note: this assembly features a 5-tooth intake reluctor wheel. It does not fit manual transmission applications, turbocharged Mazdaspeed models, or 2.0L base engine variants.

Installation Protocol Service Schedules

Verify variable valve timing solenoid screen cleanliness and reconnect all powertrain ground straps before cranking the starter. Flush the transmission fluid cooler and replace intake manifold runner control gaskets before startup. Warning: never run this non-turbo long block in aftermarket turbo systems exceeding 5 PSI of boost without forged low-compression pistons.

- Fill crankcase with 4.5 quarts of SAE 5W-20 break-in oil before running the starter
- Drain break-in motor oil and install a replacement oil filter after the initial 500 miles
- Perform routine synthetic motor oil and filter changes every 3,000 miles or 5,000 miles

Warranty Terms Core Return Policy

Every remanufactured Mazda engine includes our comprehensive 3-Year Unlimited-Mile parts warranty for consumer and commercial peace of mind. Our freight team provides prepaid return tags for your rebuildable core block within an authorized 30-day window. Each crate delivers the long block, oil pan, front timing cover, and installation manual.