Infiniti Nissan QR25DE 2.5L L4 Remanufactured Engine – 2014-2017

Description

Catalytic converter ceramic dust ingestion and excessive oil consumption under continuous highway commuting compromise fleet vehicle uptime until diamond plateau honing and precision deck resurfacing restore cylinder sealing inside the Infiniti Nissan QR25DE 2.5L Remanufactured Engine. Built for 2014 to 2017 commercial sedans and crossovers, this 16-valve DOHC CVTC powertrain outputs dependable pulling performance and verified mechanical stamina.

Featuring an open-deck aluminum block with cast-iron cylinder liners, deck surfaces are milled to Ra 28 micro-inches to optimize multi-layer steel gasket retention. An internally balanced forged steel crankshaft pairs with forged steel connecting rods and hypereutectic aluminum pistons with resin skirt coatings. Equipped with dual internal balance shafts, an aluminum lower bedplate, a dry weight of 280 lbs, and a 4.9-quart oil capacity, this engine structure holds tight clearances under continuous load.

Key Features of Infiniti Nissan QR25DE

Commercial fleet operations managers buy Infiniti Nissan QR25DE 2.5L remanufactured engine packages to preserve high-mileage passenger fleets without purchasing expensive replacement vehicles. Automated cold-spin testing verifies hydrodynamic bearing oil film retention across every single crankshaft journal before transport packaging.

• Continuously Variable Valve Timing optimizes intake airflow for responsive acceleration and high fuel economy.
• Multi-layer steel cylinder head gaskets maintain combustion containment during severe summer heat cycles.
• Dual internal counter-rotating balance shafts cancel secondary engine harmonics for smooth highway cruising.
• Cast aluminum lower block girdle locks main bearing caps rigid under peak acceleration.
• High-pressure internal trochoid oil pump feeds 55 PSI through clear block lubrication galleys.
• Dynamic mass balancing keeps harmonic rotating unbalance below 0.5 gram-inches.
• This Infiniti Nissan QR25DE crate motor matches factory continuously variable transmission bell housings.

Four Cylinder Dynamic Thermal Bounds

Engine lubrication maintains 20 PSI at warm idle and stabilizes between 50 and 65 PSI at 3000 RPM cruising speed. Coolant temperature operates from 185°F to 200°F via the primary thermostat circuit. The engine outputs 182 continuous brake horsepower at 6000 RPM and 180 lb-ft torque at 4000 RPM. A 10.0:1 compression ratio yields 175 to 190 PSI cranking compression across all four cylinders. Rated for Severe Commercial Fleet duty, radiator heat rejection reaches 3,100 BTU/min under continuous hauling.

Driveline Flange Snout Alignment

The rear crankshaft flange uses an 8-bolt flexplate bolt circle machined for continuously variable automatic transmissions. Pilot bore diameter measures 0.826 inches with concentricity verified within 0.0008 inches to prevent torque converter pump wear. Front crankshaft snout measures 1.181 inches with a precision keyway, holding crank thrust endplay within 0.003 to 0.006 inches.

Pre-Lube Setup Operational Limits

Technicians must prime the lubrication channels using an external oil priming container through the oil pressure sensor port before initial starting. Fill with 0W-20 motor oil and clear air from the cooling system using vacuum filling equipment. This powertrain is not engineered for forced induction turbochargers exceeding 5 PSI boost, nitrous systems, or racing competition.

• Check crankcase motor oil level and coolant overflow bottles each shift.
• Change engine motor oil and filter every 4,000 miles or 150 hours.
• Inspect timing chain condition and serpentine belt tensioner every 12 months.

Fleet Warranty Transport Inventory

Protected by an extensive 3-Year / 100,000-Mile commercial fleet warranty covering parts and labor standards. Transport crate contents include the remanufactured long block engine, high-capacity oil pump, full vehicle installation gasket set, water pump inlet o-ring, pre-lube instruction sheet, and dynamometer cold-test validation reports.