High-Strength Alloy Steel Idler Gear for ISUZU 4HK1 Engine Timing System - OEM Standard Replacement

A precision-engineered steel idler gear that transmits rotation between the crankshaft gear and camshaft gear, while reversing rotational direction as required. This essential component of the timing gear train ensures precise valve timing for optimum engine performance and fuel efficiency.

The Idler Gear Assembly (OEM Numbers: 8-97120005-0 / 8971200050) is a premium-quality, direct replacement timing component engineered specifically for the ISUZU 4HK1 5.2L diesel engine, powering ISUZU 700P, NPR, NQR, NRR, N-Series (ELF) medium-duty trucks as well as a broad range of Hitachi, JCB, Case, Sumitomo excavators, wheel loaders and heavy equipment.

This critical part of the gear-driven timing train transmits rotation from the crankshaft to the camshaft(s) and fuel injection pump, ensuring precise synchronization vital for correct valve timing, optimal air-fuel mixture, and efficient combustion.

The 4HK1 engine is an inline 4-cylinder, 5.2L common-rail turbo diesel producing up to 215 hp and 452-520 lb-ft of torque. The gear-driven timing system eliminates timing belt failure and contributes to the engine's legendary durability (B10 life of 310,000-375,000 miles).

• OE Quality: Manufactured to strict ISUZU OEM dimensional, metallurgical and performance standards for perfect direct-fit replacement
• Matched to 4HK1 Gear-Driven Timing System: Integral component of the robust gear-driven valvetrain
• Precision-Ground Involute Gear Teeth: Optimized tooth geometry ensures smooth, quiet engagement
• High-Strength, Case-Hardened Alloy Steel: Heat-treated to achieve core toughness and surface hardness (HRC 58-62)
• Compatible with Press-Fit Bearing Design: Designed to accept press-fit bearing (bearing not included - service part number 8972637870)
• Wide Compatibility: Fits ISUZU 700P, NPR, NQR, NRR, N-Series trucks and compatible Hitachi, JCB, Case, Sumitomo heavy equipment
• Essential for Timing Gear Train Overhaul: Standard preventative maintenance during major engine service
• Prevents Costly Engine Damage: Eliminates risk of complete engine failure due to timing loss
• 12-Month Warranty: Backed by manufacturer batch traceability
• ISO 9001:2015 / IATF 16949 Certified: Manufacturing facility meets international automotive quality standards
• Wholesale Advantage: Available for heavy-truck parts distributors, equipment dealers, and fleet maintenance programs

• Material Verification: Premium alloy steel composition verified via spectrographic analysis
• Dimensional Accuracy: Gear tooth profile verified against OE blueprints using CMM equipment (±0.02 mm tolerance)
• Tooth Profile Inspection: Gear teeth inspected for profile, lead, pitch and surface finish
• Hardness Testing: Induction case depth and surface hardness verified via Rockwell testing
• Backlash Verification: Sample gears tested to confirm correct meshing and backlash
• IATF 16949 / ISO 9001:2015 Certified: Facility meets international automotive quality standards
• Visual Inspection: 100% inspected for grinding burns, surface cracks, and defects
• Packaged Safely: Anti-corrosion oil-coated, individually sealed in moisture-barrier VCI bag
• Full Documentation Provided: Certificate of conformance with dimensional inspections

Individual Packaging: Each idler gear is anti-corrosion oil-coated, individually sealed in moisture-barrier VCI bag with OE-style part labeling.

Wholesale / Bulk Orders: Available for heavy-truck parts distributors, engine rebuilders, and fleet operators in case packs (5, 10, 20, 50, 100 units).

Customization: Neutral or private-label retail packaging available for volume wholesale orders.

Fast Shipping: Ready stock for immediate dispatch worldwide via express courier or economical sea freight.

Wholesale Support: Long-term supply agreements, tiered commercial pricing and drop-shipping options available.