VEGE Remanufactured DFXT 4.6L 281ci High Output Long Block Engine

Description

Aluminum crossover coolant leakage and timing chain tensioner hydraulic drainback end upon mounting the VEGE Remanufactured DFXT 4.6L Long Block Engine. Supplying 250HP from a 281ci 8-Cylinder commercial long block repower layout, this unit powers fleet pursuit vehicles. Installers must verify cast iron timing tensioner body contact face flatness before torquing down primary chain guide arms.

Cast from heavy ASTM A48 Class 30 gray iron, the deep-skirt crankcase provides massive structural rigidity to counter engine vibration. The VEGE engine core utilizes induction-hardened nodular iron crankshaft journals and stellite exhaust valves. Cranking starter demand requires 12V 175A. Engine dry weight measures 490 lbs inside a 28in length, 26in width, 27in height chassis envelope holding 6.0 quarts oil.

Key Features of VEGE DFXT

Independent fleet repair facilities buy VEGE DFXT commercial long block units to stop fleet comebacks from persistent valvetrain failure. Assembly cells maintain verified industrial engine rebuild clean-room assembly practices throughout production.

• Nodular cast iron crankshaft features micro-polished journal surfaces with 0.0003in TIR runout tolerance.
• Cast iron timing chain tensioners replace plastic OEM tensioners to prevent chain guide slap.
• Diamond-honed cylinder liner walls promote rapid compression ring seating without excess cylinder wall friction.
• CNC milled deck surfaces ensure 0.0002in flatness to stop high-pressure cylinder head fire-ring blowby.
• Internal high-output oil pump maintains 55 PSI line pressure across demanding fleet highway duty.
• DFXT commercial core architecture incorporates deep-skirt cross-bolted main bearing caps for crankcase rigidity.
• Tri-metal copper-lead bearings establish 0.0015in running clearance to protect crank journals from wear.

Dynamometer Test Bench Load Ratings

Dynamometer load trials verify 250 continuous BHP alongside 295 ft-lbs torque output at 4200 RPM continuous operational rating. Galley pressure maintains 55 PSI at 195°F oil sump temperature, while exhaust gas temp levels off at 1220°F during dyno load. Bench sensors record 180 PSI compression across all eight cylinders within 3% balance. Crankshaft runout checks at 0.0003in TIR on the DFXT long block engine.

Vehicle Setup Guidance Maintenance Rules

Throttle cam return spring pull effort registers 5 lbs force on the accelerator lever bracket. This powertrain is NOT manufactured for transverse vehicle platforms or vehicles equipped with mechanical flat-tappet conversion systems. Field mechanics must follow our strict commercial service maintenance schedule.

• Drain break-in engine oil reservoir and replace oil filter at 500 miles or 30 hours.
• Set hydraulic roller lifter preload depth between 0.035in and 0.045in before sealing valve covers.
• Check exhaust manifold stud nuts for proper clamping tension after the initial run cycle.

Warranty Statement Wood Crate Inventory

Engine remanufacture follows VEGE assembly standard procedures protected by a 3-Year 100,000-mile fleet warranty. The enclosed wood crate contains the fully assembled long block, stamped sheet-metal oil pan, front timing cover, stamped valve covers, oil pickup tube, and an inspector-certified dyno test document.