Engine Piston 8-97331643-0 8973316430 For ISUZU 4HL1 6HL1 NPR NQR FRR Forward Elf — Verified OEM Direct Fit, 115mm STD Alfin Oil-Gallery Diesel Piston
Basic Properties
Place of Origin:
China
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
ISUZU 4HL1 6HL1 NPR NQR FRR Forward Elf
Trading Properties
Minimum Order Quantity:
6 pcs
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
4000 pcs/month
Specifications
| OEM Part Number: | 8-97331643-0 / 8973316430 | Part Name: | Standard Engine Piston (with Pin & Clip Options) |
| Engine Compatibility: | ISUZU 4HL1 (4.8L) / 6HL1 (7.2L) | Vehicle Models: | ISUZU NPR, NQR, NRR, NPS, FRR, Forward, Elf |
| Material: | Aluminum Alloy With Alfin Insert | Piston Diameter: | 115 Mm |
| Compression Height (KH): | 58.3 Mm | Total Length: | 112.0 Mm |
| Piston Pin Size: | 36 × 79 Mm | Ring Groove (Top / 2nd / Oil): | 3.0 / 2.0 / 3.0 Mm |
| Combustion Chamber: | Ф55 Mm | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 6–12 Months | Surface Treatment: | Graphite Coating (standard); Tin Or Moly Skirt Available |
| Construction Features: | Alfin Insert, Oil Gallery, Graphite-coated Skirt | Cylinder Configuration: | 4-cylinder (4HL1) / 6-cylinder (6HL1) |
| Certification: | ISO/TS16949 | ||
| High Light: | Isuzu 4HL1 diesel engine piston,OEM direct fit 115mm piston,Alfin oil-gallery piston for Isuzu |
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Product Description
Engine Piston 8-97331643-0 8973316430 For ISUZU 4HL1 6HL1 NPR NQR FRR Forward Elf
Product Overview
The Engine Piston with OEM numbers 8-97331643-0 / 8973316430 is a verified direct-fit replacement for ISUZU 4HL1 (4.8L) and 6HL1 (7.2L) diesel engines. This critical reciprocating component converts combustion pressure into crankshaft rotation and manages thermal load within the cylinder.
Part Number:8-94391598-0 8943915980
Product Name:Piston
Car Model:ISUZU NPR NQR FRR
Engine Model:ISUZU 4HL1 6HL1
Condition:100% Brand New
Size:Standard
Key Specifications & Verification
- ✓Dimensional Verification: Piston diameter 115 mm, compression height 58.3 mm, total length 112.0 mm, pin size 36 × 79 mm, combustion chamber Ф55 mm
- ✓Ring Groove Geometry: Ring grooves sized 3.0 mm (top) / 2.0 mm (second) / 3.0 mm (oil control)
- ✓Material & Construction: Aluminum alloy with Alfin insert for ring-land reinforcement, internal oil gallery cooling channel, and graphite-coated skirt
- ✓OEM Cross-Reference Verified: Replaces multiple OEM part numbers including 8-97331643-0, 8973316430, and related variants
- ✓Multi-Platform Application: Compatible with ISUZU NPR, NQR, NRR, NPS, FRR, Elf series and GMC/Chevrolet commercial trucks
Failure Symptoms - When to Replace
- Loss of engine compression: Worn or stuck piston rings reduce cranking pressure
- Excessive exhaust smoke: Blue/white/black smoke indicates oil passing rings or incomplete combustion
- Increased oil consumption: Glazed bores or tired ring packs allow oil into combustion chamber
- Piston scoring or scuffing: Visible skirt wear or liner wall scoring from thermal expansion or insufficient lubrication
- Knocking or tapping noise: Piston slap or bearing wear requiring immediate inspection
Vehicle & Engine Compatibility
| Brand | Model / Series | Engine | Years |
|---|---|---|---|
| ISUZU | NPR (Elf) | 4HL1 | 2002-2016 |
| ISUZU | NQR | 4HL1 | 2002-2016 |
| ISUZU | NPS | 4HL1 | 2002-2016 |
| ISUZU | Forward FRR | 6HL1 | 2000-2004 |
| GMC | W3500 / W4500 / W5500 | 4HL1 | 2003-2010 |
| Chevrolet | W3500 / W4500 / W5500 | 4HL1 | 2003-2010 |
Important Fitment Notes: Confirm engine variant (4HL1 vs 6HL1), verify piston-to-bore clearance, and check package contents. Piston rings and pin are not included unless specified.
Features & Benefits
Alfin Insert
Reinforces top ring groove against thermal fatigue and micro-welding
Internal Oil Gallery
Improves heat dissipation from crown and ring zone, reducing scuffing risk
Graphite-Coated Skirt
Provides self-lubricating properties during cold starts and reduces friction
Precision Ring Grooves
Ensures correct ring seating and sealing to restore compression
115 mm STD Diameter
Direct-fit replacement for original bore without machining
Dual Engine Compatibility
One piston covers both 4HL1 and 6HL1 engines
Quality Control & Verification
| QC Item | Verification Method |
|---|---|
| Piston diameter / ovality | CMM dimensional inspection against OEM drawing |
| Ring groove width & depth | Go/no-go gauge verification |
| Pin bore diameter & concentricity | Precision bore gauge |
| Material chemistry | Spectrometer analysis (aluminum alloy composition) |
| Surface treatment thickness | Graphite coating thickness measurement |
| Weight consistency | Batch weighing tolerance control |
Manufacturing conforms to ISO/TS16949 quality standards. Each unit undergoes 100% quality inspection before packaging.
Installation & Maintenance
Professional engine rebuild experience required. Always refer to ISUZU 4HL1/6HL1 workshop manual. Improper installation can cause engine damage and serious injury.
Installation Guidelines
- Verify fitment: Confirm piston diameter, compression height, and ring groove dimensions
- Check piston-to-bore clearance: Measure cylinder liner bore and piston skirt diameter
- Ring installation: Install rings with correct orientation; stagger ring end gaps at 120° intervals
- Pin & clip installation: Lubricate pin bore and install piston pin; secure with new snap rings
- Connecting rod torque: Follow manual sequence for specific engine variant
- Liner protrusion: Verify liner protrusion meets specification before final assembly
Maintenance Schedule
- 4HL1 engine oil capacity: 8.2 L (basic) + 0.7 L (filter) - Replace every 7,500 km or 12 months
- 6HL1 engine oil capacity: 15-17 L depending on variant - Normal oil pressure: 350-550 kPa
- Inspect compression and oil consumption every 50,000 km or annually
- Replace piston rings and inspect pistons during top-end overhaul
Packaging & Supply
- Standard packing: Neutral packaging / corrugated carton; custom branding available
- Set options: Piston only, or piston set with pin & clips
- Minimum order: 4 sets (4HL1) / 6 sets (6HL1) per order; bulk discounts available
- Suitable for: Engine rebuild workshops, fleet maintenance, spare parts distributors
- Related parts available: Piston ring sets, cylinder liner kits, piston pins, and full overhaul kits
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