Jeep Wrangler Cherokee Comanche 2.5L L4 Engine 1986

Description

Featuring an exact 2.5L displacement, this Jeep Cherokee 2.5L Remanufactured Engine brings AMC pushrod dependability back to classic off-road platforms. The 4-Cylinder 8-Valve OHV design produces proven low-end rock-crawling grunt. A vital trade-off requires high-zinc break-in motor oil during initial operation to prevent flat-tappet camshaft lobe destruction during initial lifter bed-in.

Cast iron block architecture carries casting numbers 059 and 532 stamped on the right side of the block below the number 4 spark plug. Cylinder head casting numbers include 403 and 117 with 1/2in head bolt provisions. Crated envelope dimensions measure 36in length by 36in width by 36in height with a net weight of 254 lbs. Rotating hardware includes crank casting 3239611 with a 1.50in snout, forged connecting rods, and a 4.0-quart oil pan.

Key Features of Jeep 2.5L

Restoration shops buy Jeep 2.5L remanufactured engine long blocks to repower trail-worn classic 4×4 rigs with dependable factory torque. This OHV power plant restores trail throttle response and stops excessive crankcase blowby.

• Heavy cast iron block decks are CNC-resurfaced to provide an Ra 40 finish for firm head gasket retention
• Diamond plateau cylinder honing establishes uniform cross-hatch angles to seat cast iron piston rings
• Crankshaft casting 3239611 undergoes micro-polishing to hold 0.0003in TIR journal concentricity
• Align-honed main saddles restore journal true center to protect bottom-end bearings under load
• Remanufactured cylinder heads receive 1/2in bolt drilling and cut valve seats holding 0.001in runout
• Internal block oil bypass passages are hot-tanked and cleared to maintain oil circulation
• New high-grade pushrods and hydraulic flat-tappet lifters ensure quiet valvetrain operation on steep trails

Dyno Load Precision Machining Tolerances

Dynamometer validation certifies 117 HP at 5,000 RPM along with 135 ft-lbs of continuous torque at 3,200 RPM. Machining processes hold crankshaft journal runout at 0.0003in TIR while connecting rod bearing clearances measure an exact 0.0012in. Individual cylinder compression gauges verify 155 PSI to 160 PSI across all 4 chambers. Hot engine oil pressure maintains 45 PSI at 2,500 RPM through internal block oil bypass passages, with regulated coolant operating temperatures steady at 195°F during full load machine cycles.

Vehicle Fitment Drivetrain Guide

This 1986 model year long block fits Jeep CJ7, Cherokee XJ, Comanche MJ, and Wagoneer vehicles equipped with the 2.5L 150 cubic inch engine and VIN code H. Mates to 4-Speed Manual, 5-Speed Manual, or 3-Speed Automatic four-wheel-drive gearboxes. Fitment note: this unit requires a 1.50in crankshaft snout and 1/2in cylinder head bolts. It does not fit 1987 and later multi-point fuel-injected Jeeps or GM-derived 2.8L V6 engine bay configurations.

Installation Protocol Service Schedules

Prime the oil pump using an external hex drive tool before distributor installation to fill all pushrod galleys with lubricant. Check transmission pilot bearing depth and inspect mechanical throttle linkage cables. Warning: never run this engine on dry pavement in 4WD lock or install custom turbocharger piping without supplemental engine cooling.

• Add 4.0 quarts of high-zinc 10W-30 break-in oil to coat the camshaft lobes during initial break-in
• Drain break-in lubricant and install a fresh oil filter after completing the first 500 miles
• Perform routine oil and filter maintenance every 3,000 miles using high-zinc formula lubricants

Warranty Terms Core Return Policy

Every remanufactured Jeep engine includes our 3-Year Unlimited-Mile warranty for complete peace of mind. We provide prepaid freight pickup for your old core block within a 30-day return window. Crated delivery contains the remanufactured long block, oil pan, valve cover, timing cover, and comprehensive installation manuals.