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
Price:
Negotiable
MOQ:
6 pcs
Delivery Time:
5-8 Work Days
Brand:
YIMI
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
Similar Products
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
Unit 1313, Building 5, Changsheng DDP Fashion Center, No. 17 Dachi Road, Tancun, Shijing Subdistrict, Baiyun District, Guangzhou City.
Contact Person
James