Experience quiet valvetrain operation with this rebuilt Mazda Protege Z5 1.5L Remanufactured Engine. CNC machine centers resurface block casting Z5 to restore deck flatness and cylinder bore roundness. This 1.5L 4-Cylinder 16-Valve DOHC engine demands an immediate break-in oil flush at 500 miles to eliminate break-in friction material from the oil pan.

Cast iron block casting Z5 supports a forged steel crankshaft with micro-polished journals balanced to eliminate rotating harmonic vibration. Aluminum cylinder head casting Z5 houses sixteen valves driven by dual overhead camshafts through a dual-cam cogged timing belt. Precision-fitted aluminum pistons travel within diamond-honed parent bores paired with low-friction piston rings. Crated long block weight measures 250 lbs with crated envelope dimensions of 36in length by 36in width by 36in height and holds 3.8 quarts engine oil.

Key Features of Mazda Z5

Independent automotive repair facilities buy Mazda Z5 remanufactured engine long blocks to restore original vehicle compression and highway efficiency. Technicians select this remanufactured 1.5L long block replacement to cure exhaust emissions.

- Cast iron block casting Z5 receives precision CNC deck resurfacing to support secure cylinder head gasket sealing.
- Forged steel crankshaft journals undergo micro-polishing down to 0.0003in runout to eliminate bearing friction under load.
- Aluminum cylinder head casting Z5 features three-angle valve seat cutting to hold 0.001in valve seat runout.
- Connecting rod bores receive align-honing to set bearing oil clearance at 0.0012in for consistent hydrodynamic lubrication.
- Plateau cylinder honing creates an ideal crosshatch pattern that seats compression rings within 500 miles.
- Dual belt-driven camshaft gears maintain exact valve timing without valvetrain lash irregularities or timing slip.
- New expansion plugs and brass oil gallery fittings seal internal passages against lubricant pressure loss.

Dyno Load Precision Machining Tolerances

Dynamometer testing confirms 92 HP at 5,500 RPM and 96 ft-lbs torque at 4,000 RPM under steady brake absorption. Machine shop technicians measure crankshaft journal runout at less than 0.0003in TIR with rod bearing clearances set to 0.0012in. CNC plateau honing holds cylinder bore dimensions to 0.0011in clearance against piston skirts. Operating oil pressure registers 55 PSI at 3,000 RPM while the cooling system stabilizes at 190°F. Individual cylinder compression gauges verify consistent readings between 180 PSI and 185 PSI across all four cylinders.

Vehicle Fitment Drivetrain Guide

This remanufactured engine fits 1997 to 1998 Mazda Protege and Mazda 323 models built between production dates 10/97 to 6/98 equipped with the 1.5L 1489cc L4 Engine and dual belt-driven camshafts. It couples with 5-Speed Manual or 4-Speed Automatic front-wheel-drive transaxles. This long block does not fit earlier 1995 to 9/97 Z5 editions with single-cam belt drive gears, larger 1.6L B6 engines, or 1.8L BP Protege models.

Installation Protocol Service Requirements

Check intake manifold vacuum ports and adjust mechanical accelerator cable slack before bolting the engine to the transaxle bellhousing. Never drop this naturally aspirated compact long block into high-boost turbo packages or custom track carts lacking external oil cooling. Mechanics must purge air from the cooling circuit to prevent local hot spots.

- Crank the starter motor with ignition disabled to build oil pressure before allowing the engine to start.
- Dump the initial break-in motor oil and install a fresh oil filter at 500 miles.
- Inspect timing belt tension and check camshaft oil seals at the 3,000 miles service interval.

Warranty Terms Core Return Policy

This product carries our comprehensive 3-Year Unlimited-Mile warranty that covers internal machine shop components and labor. We provide prepaid freight pickup for your rebuildable engine core inside a standard 30-day window. The crated shipment includes the assembled long block core, pre-installed timing components, oil pan, and valve cover.