Vehicle owners battle timing chain guide failure and severe oil leaks on aging modular V6 platforms. The Ford Mercury 2.5L Remanufactured Engine solves valvetrain noise and restores factory horsepower. Displacing 2.5L across a 60-degree V6 block, this 24-Valve DOHC long block features F53E casting architecture. Technicians must purge cooling air locks to prevent localized cylinder head warping.

Cast aluminum alloy forms the rigid 60-degree V6 engine block with casting marks F53E-NB, LA, or NC on the right top deck. Twin 24-Valve DOHC aluminum cylinder heads carry casting codes F73E-DA and F53E. A precision-ground cast iron crankshaft rotates in align-honed main saddles. Dry engine mass measures 220 lbs. Packaged shipping crate dimensions span 36in length, 36in width, and 36in height, with a 5.5 quarts oil pan capacity.

Key Features of Ford Mercury 2.5L

Automotive rebuild centers buy Ford Mercury 2.5L remanufactured engine assemblies to restore aging sedans to factory highway performance without check engine warnings. This 24-Valve long block replaces tired powertrains in transverse front-wheel-drive engine bays.

- Dual overhead camshafts drive four valves per cylinder to produce strong mid-range passing power.
- Re-machined F53E block casting maintains true bore alignment to prevent piston slap under thermal expansion.
- Precision-ground crankshaft features micro-polished journal fillets to preserve hydrodynamic bearing lubrication.
- Plateau honed cast iron cylinder liners seat replacement piston rings to stop oil consumption.
- Upgraded multi-layer steel cylinder head gaskets withstand high thermal cycles without coolant leaks.
- Hardened exhaust valve seats resist recession under prolonged high-RPM driving conditions.
- Pre-timed dual timing chain system ensures accurate valvetrain synchronization and prevents timing drift.

Duratec Dyno Machining Precision Tolerances

Dynamometer spin testing confirms 170HP at 6,250 RPM and 165 ft-lbs torque at 4,250 RPM on unleaded gasoline. Crankshaft main journal runout measures within 0.0003in TIR across micro-polished bearing surfaces. Connecting rod oil clearances hold at 0.0012in to prevent hydrodynamic oil wedge failure during high-RPM sweeps. Hot oil pressure sustains 55 PSI at 3,000 RPM with coolant stabilized at 195°F. Cylinder compression checks record 190 PSI across all six cylinders, verifying uniform valve seat concentricity and complete piston ring seal.

Vehicle Fitment Drivetrain Guide

Specific vehicle fitment includes 1995 to 1997 Ford Contour and 1995 to 1997 Mercury Mystique sedans equipped with the 2.5L 2544cc V6 engine under Engine VIN Code L. Casting identification confirms block codes F53E-NB, LA, or NC and head codes F73E-DA or F53E. It mates with factory 4-Speed automatic and 5-Speed manual transaxles. This engine does not fit 1998 and later Duratec platforms, 3.0L Taurus models, or SVT Contour high-output variants.

Installation Protocol Service Schedules

Mechanical throttle linkages require smooth cable travel without sharp bends in the cowl area. Mechanics must inspect water pump drive belts and replace coolant crossover gaskets prior to final startup. Never install this naturally aspirated production V6 long block in custom turbo configurations exceeding 6 PSI on stock compression pistons.

- Drain initial break-in engine oil and swap the spin-on filter after 500 operating miles.
- Inspect water pump drive belt and serpentine tensioner every 10,000 driving miles.
- Change motor oil and filter every 3,000 miles using certified 5W-30 synthetic motor oil.

Warranty Terms Core Return Policy

Warranty terms provide a 3-Year Unlimited-Mile replacement guarantee on internal lubricated rotating engine parts. Return your like-for-like core within 30 days using prepaid freight documentation to secure core credit. The crated package contains the remanufactured long block, pre-installed timing components, oil pan, and shop installation guides.