Forged High-Strength Alloy Steel Connecting Rod Assembly Weight Matched (±2 grams) Direct OEM Replacement for ISUZU 4HK1 6HK1 Diesel Engine

Name: Forged High-Strength Alloy Steel Connecting Rod Assembly Weight Matched (±2 grams) Direct OEM Replacement for ISUZU 4HK1 6HK1 Diesel Engine
Brand: Yimi (Guangzhou) Automotive Parts Co, Ltd
SKU: ISUZU NPR 4HK1 6HK1
Availability: InStock

Basic Properties

Place of Origin: China

Brand Name: YIMI

Certification: ISO/TS16949

Model Number: ISUZU NPR 4HK1 6HK1

Trading Properties

Minimum Order Quantity: 10 pcs

Price: Negotiable

Payment Terms: T/T,

Supply Ability: 10000 pcs/month

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Specifications

Part Number:	8-98018425-0, 8980184250, 8-98018425-1, 8980184251, 8980184252	Weight Matching:	±2 Grams (batch-controlled)
Small-End Bushing:	Pressed-in Bronze Bushing (factory Installed)	Material:	Forged High-strength Alloy Steel
Engine Applications:	ISUZU 4HK1 (5.2L), 6HK1 (7.8L), Also 4HE1, 6HE1, 6HH1	Construction:	Forged I-Beam
Pin Design:	Full-Floating Piston Pin	Service Life:	500,000+ Km
High Light:	ISUZU 4HK1 connecting rod assembly , forged alloy steel connecting rods , OEM replacement ISUZU diesel engine parts

Product Description

Connecting Rod 8-98018425-0 For ISUZU NPR 4HK1 6HK1 Diesel Engine 8980184250

The Connecting Rod Assembly (OEM: 8-98018425-0 / 8980184250) is a direct-fit, OE-quality connecting rod engineered for ISUZU NPR, NQR, NRR, 700P, and F-series medium-duty trucks powered by 4HK1 (5.2L) and 6HK1 (7.8L) turbocharged common-rail diesel engines. This component is the critical mechanical link between the piston and the crankshaft - it converts the explosive force of combustion into rotational torque, making it one of the most highly-stressed parts in the engine.

ISUZU Connecting Rod 8-98018425-0 for 4HK1 6HK1 Diesel Engine

Product Specifications

Part Number:	8-98018425-0 8980184250	Product Name:	Connecting Rod
Car Model:	ISUZU NPR	Engine Model:	ISUZU 4HK1 6HK1
Condition:	100% Brand New	Size:	Standard
Weight:	Standard	Origin:	China Mainland
Main Market:	Middle East, Asia, Africa, South America, North America & Europe
Package:	Neutral Packing Or Make It As Requested
Warranty:	6 Months
Price & Stock:	Please Contact Us To Get More Information
Material:	High-strength aluminum alloy & precision bearings	Cooling Type:	Engine coolant circulation
Installation:	Direct OEM replacement	Quality Standard:	OEM equivalent / ISO quality control

Failure Analysis Data

In a study of 105 Isuzu NPR / 700P fleet vehicles (4HK1 engines, average mileage 320,000 km):

18% of catastrophic engine failures were traced to bent or cracked connecting rods caused by over-speeding, hydro-lock (coolant or oil ingestion), or metal fatigue.
12% of low oil pressure complaints were the result of a damaged big-end bearing caused by a bent rod (out-of-round journal alignment).
Typical failure modes: Bent rod (hydrolock), cracked rod (fatigue), seized small-end bushing (lack of lubrication).

Features & Advantages

OE Quality - Manufactured to strict Isuzu OEM dimensional and material standards for perfect fit.
Critical Engine Component - The connecting rod is the most highly-stressed part in a diesel engine. A bent or cracked rod leads to catastrophic failure (thrown rod, block penetration).
Forged I-Beam Construction - High-strength alloy steel forging provides exceptional resistance to bending and fatigue under high cylinder pressures.
Full-Floating Piston Pin Design - Precision-bushed small end reduces friction and wear, eliminates press-fit pin issues.
Weight-Matched (±2 g) - Prevents engine imbalance and vibration at high RPM.
100% Crack-Tested (MPI) - Each rod undergoes magnetic particle inspection to guarantee no surface or subsurface cracks.
Restores Engine Performance - Replaces bent or damaged rods, restoring compression, eliminating knock, and returning full power.
Direct Replacement - Simple bolt-in installation (professional engine builder required) - no modifications or re-balancing needed.
Long Service Life - Designed for 500,000+ km of heavy-duty commercial operation.

Quality Control Standards

Material Verification - Forged alloy steel composition (C, Mn, Cr, Mo) verified via spectrographic analysis.
Dimensional Accuracy - Big-end bore, small-end ID, and center-to-center length measured to ±0.01mm using CMM.
Hardness Testing - Case hardness (HRC) and core hardness verified on batch samples.
Weight Matching - Each rod individually weighed and sorted to ±2 grams.
Magnetic Particle Inspection (MPI) - 100% MPI-tested after final machining for surface cracks.
Fatigue Sample Testing - Representative samples tested to 10⁷ cycles without failure (ISO 1143).
ISO 9001:2015 / IATF 16949 Certified - Facility meets international automotive quality standards.
Visual Inspection - 100% inspected for forging flash, machining burrs, or thread damage.
Packaged Safely - Oil-coated, sealed in anti-corrosion bag, boxed with OE-style labeling.

Common Failure Symptoms & Diagnosis

Symptom	Likely Cause	Action
Metallic knock / heavy clanking from crankcase	Worn or cracked rod bearing / bent rod	Inspect rod, replace if bent or cracked
Low oil pressure	Out-of-round big-end bore (bent rod)	Replace rod, check crankshaft journal
Engine vibration	Uneven rod weight (unbalanced)	Replace with weight-matched set
Misfire / compression loss	Bent rod causing piston to contact crank	Immediate rod replacement

Inquiry

For bulk orders, technical datasheets, or fitment verification (NPR, 4HK1, 6HK1), contact our sales team. We respond within 24 hours with wholesale pricing and stock confirmation.