Standard Piston 8-97183666-0 8971836660 For ISUZU NPR NQR NKR 4HG1 4HG1T 4.6L — Verified OEM Direct Fit, 115mm STD Alfin Oil-Gallery Diesel Engine Piston
Price:
Negotiable
MOQ:
4 pcs
Delivery Time:
5-8 Work Days
Brand:
YIMI
Product Description
Standard Piston 8-97183666-0 8971836660 For ISUZU NPR NQR NKR 4HG1 4HG1T 4.6L — Verified OEM Direct Fit, 115mm STD Alfin Oil-Gallery Diesel Engine Piston
Product Overview
The Engine Piston with OEM numbers 8-97183666-0 / 8971836660 is a verified direct-fit replacement for ISUZU NPR, NQR, and NKR series trucks equipped with the 4HG1 / 4HG1T (4.6L) diesel engine. This critical reciprocating component converts combustion pressure into crankshaft rotation and manages thermal load within the cylinder.
Part Number: 8-97183666-0 8971836660
Vehicle Model: ISUZU NPR NQR NKR
Engine Model: ISUZU 4HG1 4HG1T
Condition: 100% Brand New
Size: Standard 115mm
Key Specifications:
- Piston Diameter: 115 mm
- Compression Height: 60.7 mm
- Pin Diameter: 36 × 79 mm
- Total Height: 104.4 - 104.5 mm
- Combustion Chamber: Ф51.6 mm
- Ring Grooves: 3.0 mm (top, Keystone) / 2.5 mm (second) / 4.0 mm (oil control)
Vehicle & Engine Compatibility
| Brand | Model / Series | Engine | Years |
|---|---|---|---|
| ISUZU | NPR | 4HG1 / 4HG1T | 2000-2016 |
| ISUZU | NPR71 | 4HG1 | 1996-2002 |
| ISUZU | NQR | 4HG1 | 1997-2016 |
| ISUZU | NQR71 | 4HG1 | 1996-2002 |
| Chevrolet | NPR / NQR / NNR | 4HG1 | 1999-2012 |
Important Fitment Notes:
- Confirm engine variant: 4HG1 (naturally aspirated) vs. 4HG1T (turbocharged)
- Verify piston-to-bore clearance and valve-to-piston clearance against ISUZU workshop manual
- 4HG1-T engines are known for tight valve clearances that can cause piston contact
- Piston rings and pin are not included unless specified
Features & Benefits
Alfin Insert
Reinforces top ring groove against thermal fatigue and micro-welding
Oil Gallery Construction
Improves heat dissipation from crown and ring zone, reducing scuffing risk
Tin Coating
Enhances break-in characteristics and reduces friction during initial operation
Precision Ring Grooves
Ensures correct ring seating and sealing to restore compression
115mm STD Diameter
Direct-fit replacement for original bore without machining
4-Cylinder Application
Matched to 4HG1's 4-cylinder configuration for balanced performance
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-to-valve contact: 4HG1-T engines are known for interference when valve clearances aren't maintained
- Knocking or tapping noise: Piston slap or bearing wear requiring inspection
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 | Tin coating thickness measurement |
| Weight consistency | Batch weighing tolerance control |
Manufacturing conforms to ISO/TS16949 quality management system standards. Each unit undergoes 100% quality inspection before packaging.
Installation & Maintenance
IMPORTANT: Professional engine rebuild experience required. Always refer to the ISUZU 4HG1 workshop manual for complete specifications. Improper installation can result in 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
- Check valve-to-piston clearance: Verify thermal clearances within specification
- 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
Maintenance Schedule:
- Inspect compression and oil consumption every 50,000 km or annually
- Replace piston rings and inspect pistons during any top-end overhaul
- Monitor valve clearances - 4HG1 is sensitive to thermal valve clearance adjustments
- After 400,000 km, inspect for cylinder ellipticity and piston wear
Packaging & Supply
- Standard packing: Corrugated carton with anti-rust paper; 4 pcs in one box
- Set options: Piston only, or piston set with pin & clips
- 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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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