Featuring an exact 2488cc displacement, this Nissan Altima QR25DE Remanufactured Engine incorporates high-output camshafts and casting JA0 cylinder head architecture. Machinists ream connecting rod small ends and line-hone cast aluminum blocks. Technicians must conduct complete cooling system bleeding and perform a strict 500-mile break-in oil drain to preserve balance shaft and cam journal surfaces.

Cast with passenger-side QR25DE markings, the aluminum open-deck engine block features cast iron cylinder sleeves align-honed for true crankshaft saddle geometry. The rotating group pairs a micro-polished forged steel crankshaft with tri-metal performance rod bearings and hypereutectic aluminum pistons. Cylinder head casting JA0 provides optimized intake flow paths. Long block weight equals 220 lbs in a crated envelope of 36in length by 36in width by 36in height. Oil pan capacity holds 4.9 quarts.

Key Features of Nissan QR25DE

Professional technicians buy Nissan QR25DE remanufactured engine long blocks to restore aggressive acceleration and factory exhaust emission control. This assembly supports high-output manual transmission front-wheel-drive configurations.

- High-output factory profile camshafts maintain exact valve lift and duration for consistent high-RPM torque delivery across power bands.
- Casting JA0 cylinder heads undergo CNC five-angle valve jobs to guarantee airtight combustion sealing.
- Diamond plateau honing across cylinder walls produces an Ra 16 micro-inch oil-retaining crosshatch finish.
- Micro-polished crankshaft rod and main journals hold less than 0.0003in total indicator reading runout to protect engine bearings.
- Multi-layer steel head gaskets withstand extreme chamber temperatures to prevent head gasket blow-by.
- Precision balance shaft assemblies receive upgraded bearings to minimize secondary four-cylinder engine vibration.
- High-strength cylinder head bolts deliver uniform clamping pressure across every aluminum deck fire ring.

Dyno Benchmark Precision Clearance Tolerances

Dyno cell testing certifies real-world engine power output and oiling integrity before dispatch. The 2.5L engine generates 200 HP at 6,600 RPM and 180 ft-lbs of shaft torque at 5,200 RPM in high-output tune. Crankshaft journal oil clearances calibrate between 0.0012in and 0.0015in, while connecting rod clearances hold at 0.0013in. Compression testing delivers 190 PSI across all four cylinders. Hot oil pressure registers 60 PSI at 3,000 RPM while regulated coolant temperatures maintain 190°F under simulated dyno pull loads.

Vehicle Fitment Drivetrain Guide

Engine fitment covers 2007 to 2010 Nissan Altima and 2007 to 2012 Nissan Sentra SE-R chassis equipped with the 2.5L 2488cc DOHC engine, casting JA0 cylinder heads, and manual transaxles. Compatible drivetrains require front-wheel drive. This assembly does not fit automatic or CVT Altima models, all-wheel-drive Rogue crossovers, or older 2002 to 2006 Altima chassis due to distinct crankshaft reluctor teeth, bellhousing dowel locations, and balance shaft drive designs.

Installation Protocol Service Requirements

Technicians must inspect manual clutch pilot alignment and purge air from the cooling system heater core during initial installation. Operational warnings restrict use in non-intercooled forced induction systems exceeding 6 PSI or track chassis lacking auxiliary oil coolers.

- Pre-lube the engine by priming the oil pump system with 5W-30 synthetic motor oil before startup.
- Drain break-in oil and replace the high-efficiency oil filter element after the initial 500 miles.
- Verify manual transaxle bellhousing bolt torque and inspect engine mount bushings at the 1,000-mile inspection mark.

Warranty Terms Core Return Policy

Every remanufactured long block comes backed by a comprehensive 3-Year Unlimited-Mile warranty. We arrange free prepaid return freight shipping for your original rebuildable core within 30 days of delivery. The wooden crate contains the sealed long block, timing components, oil pan, and valve cover assembly.