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
| OEM Part Number: | 8-97183666-0 / 8971836660 | Part Name: | Standard Engine Piston (with Pin & Clip Options) |
| Engine Compatibility: | ISUZU 4HG1 / 4HG1T (4.6L, Naturally Aspirated & Turbocharged) | Vehicle Models: | ISUZU NPR, NQR, NKR, NHR (2000–2016) |
| Material: | Aluminum Alloy With Alfin Insert | Piston Diameter: | 115 Mm |
| Compression Height (KH): | 60.7 Mm | Total Height: | 104.4–104.5 Mm |
| Piston Pin Diameter: | 36 × 79 Mm | Ring Groove (Top / 2nd / Oil): | 3.0 Mm (3.0K) / 2.5 Mm / 4.0 Mm |
| Combustion Chamber: | Ф51.6 Mm | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 1 Year (standard Replacement Warranty) | Surface Treatment: | Tin Coating |
| Construction Features: | Alfin Insert, Oil Gallery | ||
| High Light: | Isuzu NPR diesel engine piston,OEM direct fit 115mm piston,Alfin oil-gallery piston 4HG1 |
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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.
- 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)
| 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 |
- 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
- 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
| 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 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
- 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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