Forged High-Strength Alloy Steel Connecting Rod Assembly Weight Matched (±2 grams) Direct OEM Replacement for ISUZU 4HK1 6HK1 Diesel Engine
Price:
Negotiable
MOQ:
10 pcs
Delivery Time:
5-8 Work Days
Brand:
YIMI
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.
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.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Yimi (Guangzhou) Automotive Parts Co, Ltd
Location
4F, 7th, No. 2, South Jinguu Road, Huadong Town, Huadu District, Guangzhou City
Contact Person
James