Eliminate piston slap and restore all-wheel-drive towing power with the Nissan X-Trail QR25DE Remanufactured Engine across rugged backcountry terrain. This 2.5L 4-Cylinder 16-Valve DOHC long block features dedicated 8H7 block and 8H3 cylinder head castings. Diamond plateau honed cylinder walls prevent ring blow-by. Technicians must align transfer case dowel pins with precision during transmission bellhousing attachment.

Die-cast aluminum alloy forms the reinforced 8H7 and 6N2 block casting, fitted with centrifugal cast iron cylinder liners engineered for all-wheel-drive stress. A micro-polished forged steel crankshaft rotates in align-honed main saddles below an 8H3 16-Valve DOHC aluminum cylinder head. Dry engine mass measures 220 lbs. The packaging crate spans 36in length, 36in width, and 36in height, with the lower steel pan holding 4.9 quarts of motor oil.

Key Features of Nissan X-Trail QR25DE

Automotive service shops buy Nissan X-Trail QR25DE remanufactured engine assemblies to restore original compression and all-wheel-drive capability to compact sport utility vehicles. This precision long block replaces tired powertrains in rough terrain utility vehicles.

- Reinforced 8H7 block casting incorporates thick structural ribs to withstand all-wheel-drive driveline torque.
- Cylinder head casting 8H3 optimizes port airflow to generate high low-RPM torque for steep climbs.
- Forged steel crankshaft undergoes precision micro-polishing to reduce rotational bearing friction under load.
- Centrifugal cast iron liners receive diamond plateau honing to guarantee immediate piston ring seal.
- Upgraded multi-layer steel head gasket maintains combustion seal integrity under extreme thermal cycles.
- Dual overhead camshafts actuate 16 valves through shimless buckets to maintain stable valve lash.
- Pre-assembled timing chain set ensures accurate camshaft synchronization and prevents ignition timing drift.

AWD Dyno Precision Machining Tolerances

Dynamometer load cells confirm 165HP at 6,000 RPM and 170 ft-lbs torque at 4,000 RPM on unleaded gasoline. Crankshaft main journal runout measures within 0.0003in TIR across induction-hardened bearing surfaces. Connecting rod oil clearances hold at 0.0013in to ensure continuous hydrodynamic wedge formation under heavy load. Sump lubrication pressure sustains 60 PSI at 3,000 RPM with coolant stabilized at 195°F. Cylinder compression checks verify 180 PSI across all four cylinders, confirming concentric valve seats and tight piston ring end-gap fitment.

Vehicle Fitment Drivetrain Guide

This QR25DE long block fits 2005 to 2006 Nissan X-Trail sport utility vehicles equipped with all-wheel-drive powertrains. The reinforced bellhousing pattern mates with factory 4-Speed automatic and 5-Speed manual transaxles coupled to transfer cases. Casting identification 8H7 marks the block and 8H3 marks the head. This engine does not fit front-wheel-drive Sentra models, JA0 casting Rogue crossovers, or Altima sedans with different starter bellhousing pockets.

Installation Protocol Service Schedules

Electronic drive-by-wire throttle bodies require clean sensor connections during engine bay installation. Mechanics must check all-wheel-drive transfer case fluid levels and inspect motor mounts prior to vehicle testing. Never install this naturally aspirated production long block in custom high-boost turbo setups running over 8 PSI on stock cast pistons.

- Drain initial break-in engine oil and swap the spin-on filter after 500 operating miles.
- Inspect transfer case bolts and accessory drive belt tension every 10,000 road miles.
- Change motor oil and filter every 3,000 miles using certified 5W-30 synthetic engine oil.

Warranty Terms Core Return Policy

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