1-43111170-1 OEM Number Steering Knuckle for ISUZU CYZ51 EXZ51 Front Axle Steering Knuckle Assembly High-Strength Cast Steel

The Front Axle Steering Knuckle Assembly with OEM numbers 1-43111170-1 and 1431111701 is a verified direct-fit replacement for ISUZU CYZ51 / EXZ51 / CYZ51K / CXZ81K / GIGA heavy-duty trucks equipped with 6WF1 / 10PE1 diesel engines. This front axle steering knuckle is a critical load-bearing and steering component that connects the front axle beam to the wheel hub assembly, supporting the vehicle's front weight while allowing the front wheels to pivot for steering.

The front axle steering knuckle is a massive cast steel component mounted at the end of the front axle beam. It serves as the mounting point for the front wheel hub, brake assembly, and steering arm. The knuckle pivots on the king pin (or king pin bushings) to allow the front wheels to turn left and right for steering. It must withstand the vehicle's front axle load (which can exceed 5 tonnes for heavy trucks), braking forces, and steering forces simultaneously.

The 6WF1 is a 14.3L inline-six turbo-diesel engine producing approximately 304 HP, and the 10PE1 is a 15.7L inline-six turbo-diesel producing approximately 350 HP — both widely used in ISUZU GIGA series heavy trucks from 1994 to 2008. The steering knuckle is manufactured from high-strength cast steel with precision-machined king pin bores, wheel hub mounting surfaces, and steering arm attachment points, all engineered to ISUZU OEM specifications for reliable heavy-duty performance.

Replace the front axle steering knuckle when any of these symptoms appear:

• Visible cracks on the knuckle body — cracks compromise structural integrity and can lead to catastrophic failure under load.
• Excessive steering play or wander — worn king pin bores or steering arm mounting points allow the wheel to move independently of the steering input.
• Uneven or accelerated front tire wear — misaligned knuckle geometry from wear or deformation causes irregular tire wear patterns.
• Hard steering or binding — seized or corroded king pin bores prevent smooth steering operation.
• Clunking or knocking noise from the front axle — excessive clearance between the knuckle and king pin causes metal-to-metal contact.
• Visible deformation or bending of the knuckle arm — impact damage from road hazards can bend the steering arm, affecting steering geometry.

1. Preparation: Raise the vehicle on a hoist. Remove the front wheels. Support the front axle beam securely. Disconnect the steering linkage from the steering arm.
2. Disassembly: Remove the brake caliper and hub assembly from the knuckle. Remove the king pin lock pin and cover plates. Press the king pin out using a hydraulic press. Remove the old bushings and seals.
3. Inspection: Inspect the knuckle for cracks using magnetic particle inspection (MT) or dye penetrant inspection (PT). Inspect the king pin bore for wear, scoring, or elongation. If the bore is worn beyond specification, the knuckle must be replaced.
4. Installation: Press new bushings into the knuckle. Lubricate the king pin and bushings with chassis grease. Install the king pin and thrust bearing. Install the lock pin and cover plates.
5. Hub and Brake Installation: Reinstall the wheel hub, brake rotor, and caliper. Torque all fasteners to specification.
6. Steering Linkage Reconnection: Reconnect the steering linkage to the steering arm. Torque the retaining bolts to specification.
7. Wheel Alignment: Perform a professional wheel alignment to restore correct steering geometry.
8. Road Test: Lower the vehicle and perform a road test to verify proper steering operation and absence of noise or vibration.

• Every 10,000 km: Grease king pins through the grease fittings. Check for steering play.
• Every 40,000–50,000 km: Inspect steering knuckle for cracks or deformation. Check king pin bushings for wear.
• Every 100,000 km: Perform magnetic particle inspection (MT) on the steering knuckle.
• When steering play is detected: Inspect king pins and steering knuckle immediately.
• At any front axle service: Always inspect the steering knuckle for cracks and replace if any abnormality is found.

• Standard Packaging: Anti-rust oil + VCI film + neutral carton + wooden case.
• Custom Packaging: Neutral box, color box, or customer-branded packaging.
• Suitable For: Heavy-truck repair shops, ISUZU parts distributors, fleet maintenance centers.
• Supply Capacity: Stable batch supply with batch-level quality reports available.
• MOQ: Small quantities accepted (quantity discounts available).