ISUZU 4HG1 4HJ1 Standard Piston Ring Set Chrome Plated Ø115 mm Bore OEM Fit 8-97219054-0 8972190540
| 1st Compression Ring: | 3.00 Mm HK (Keystone) | Surface Treatment: | Chrome Plating / Nitriding / Phosphating |
| Net Weight: | Approx. 0.1 Kg | Oil Ring End Gap: | 0.25–0.40 Mm |
| Ring Set Quantity: | 4 Pistons (16 Rings Total) | Bore Diameter: | Ø115 Mm |
| 3rd Oil Ring: | 4.00 Mm | Top Ring End Gap: | 0.30–0.45 Mm |
| High Light: | Chrome Plated Piston Ring Set,Ø115 mm Bore Standard Piston Ring Set,OEM Fit ISUZU Piston Ring Set |
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Standard Piston Ring Set 8-97219054-0 8972190540 for ISUZU 4HG1 4HG1-T 4HJ1 NPR71 NKR NQR — Verified OEM Fit Ø115 mm Chrome-Plated Ring Set
This piston ring set is a verified direct-fit replacement for ISUZU NPR71 / NKR / NQR71 / NPR66 / NPR70 / NPR75 / ELF trucks and Bogdan A-091 / A-092 buses equipped with 4HG1 / 4HG1-T / 4HJ1 diesel engines. This critical engine sealing component maintains compression, controls oil consumption, and transfers heat from the piston to the cylinder wall.
The piston ring set consists of three rings per piston:
- First compression ring (top ring): 3.00 mm HK (Keystone) type - seals combustion gases and transfers heat
- Second compression ring: 2.50 mm - provides secondary compression sealing and scrapes excess oil
- Oil control ring: 4.00 mm - controls oil distribution on the cylinder wall
The 4HG1 engine is a 4.57L inline-four direct-injection diesel producing 121 HP at 3,200 rpm and 328 Nm of torque at 1,850 rpm. The ring set is manufactured from high-grade cast iron and alloy steel with chrome-plated, nitrided, or phosphated surface treatments for wear resistance.
Replace the piston ring set when any of these symptoms appear:
- Excessive oil consumption - worn or stuck oil rings allow oil to enter combustion chamber
- Blue exhaust smoke - oil burning in combustion chamber
- Loss of compression and power - reduced cylinder sealing causing power loss and hard starting
- Blow-by (excessive crankcase pressure) - combustion gases escaping past worn rings
- Engine knocking or abnormal noise - piston slap or detonation-related noise
- Metal debris in oil pan - ring and cylinder wall wear contamination
| Verification Item | Data / Standard |
|---|---|
| Part Number (Short) | 8-97219054-0 |
| Part Number (Long) | 8972190540 |
| Vehicle Models | ISUZU NPR71 / NKR / NQR71 / NPR66 / NPR70 / NPR75 / ELF |
| Engine Compatibility | 4HG1 / 4HG1-T / 4HJ1 / 4HK1-T |
| Bore Diameter | Ø115 mm |
| Ring Configuration | 3 rings per piston |
| 1st Compression Ring (Top) | 3.00 mm HK (Keystone) |
| 2nd Compression Ring | 2.50 mm |
| 3rd Oil Ring | 4.00 mm |
| Ring Set Quantity | 4 pistons (16 rings total) |
| Top Ring End Gap | 0.30–0.45 mm |
| Oil Ring End Gap | 0.25–0.40 mm |
| Certification | ISO/TS 16949 |
| Type | Number |
|---|---|
| Primary OEM — Short | 8-97219054-0 |
| Primary OEM — Long | 8972190540 |
| Consecutive / Replacement | 8-97105-867-0 / 8971058670 |
| Consecutive / Replacement | 8-98054-995-0 / 8980549950 |
| Consecutive / Replacement | 8-98054-995-1 / 8980549951 |
| Aftermarket Reference | 17915 / SDI10160ZZSTD / TP 32631 / TP 32645 |
| Part Number: | 8-97219054-0 8972190540 |
| Product Name: | Standard Piston Ring Set |
| Car Model: | 4HG1 4HJ1 |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
Primary Applications:
| Brand | Model | Engine | Years |
|---|---|---|---|
| ISUZU | NPR | 4HG1 / 4HG1-T | 1995–2016 |
| ISUZU | NKR | 4HG1 / 4HG1-T | 1994–2007 |
| ISUZU | NQR | 4HG1 / 4HG1-T | 1996–2016 |
| ISUZU | ELF | 4HG1 / 4HG1-T | 1994–2016 |
Non-ISUZU Applications (Same Platform):
| Brand | Model | Application |
|---|---|---|
| Bogdan | A-091 / A-092 | Bus |
| Chevrolet | W3500 / W4500 | Light Truck |
| GMC | W3500 / W4500 | Light Truck |
Optimizes compression sealing, heat transfer, and oil control for reliable diesel operation
Wedge-shaped cross-section maintains radial contact pressure as the ring wears
High hardness and wear resistance under extreme diesel combustion pressure
Cast iron & alloy steel construction for excellent thermal stability and fatigue resistance
Precision-matched to ISUZU 4HG1 cylinder liner - direct drop-in fit
16 rings supplied together to ensure balanced compression across all cylinders
| QC Item | Verification Method / Standard |
|---|---|
| Bore Diameter (Ø115 mm) | CMM, 100% inspection |
| Ring Thickness | Micrometer, 100% inspection |
| Ring End Gap | Feeler gauge, 100% inspection |
| Surface Hardness | Hardness tester, batch sampling |
| Material Composition | Spectrometer analysis, batch sampling |
| Chrome Plating Thickness | Coating thickness gauge, batch sampling |
Reference ISUZU 4HG1 Workshop Manual:
- Preparation: Remove cylinder head and oil pan. Withdraw piston and rod assemblies
- Inspection: Inspect cylinder liner bore for wear. Clean piston ring grooves thoroughly
- Ring End Gap Check: Measure end gap - top compression: 0.30–0.45 mm, oil ring: 0.25–0.40 mm
- Ring Installation: Install oil ring first, then second compression ring, then top compression ring
- Piston Installation: Use ring compressor. Ensure piston orientation mark faces engine front
- Final Assembly: Install cylinder head and oil pan. Refill with fresh oil and coolant
Recommended Torque Values:
| Measurement | Specification |
|---|---|
| Top Ring End Gap | 0.30–0.45 mm |
| Oil Ring End Gap | 0.25–0.40 mm |
| Connecting Rod Bearing Bolts | Per ISUZU workshop manual |
| Cylinder Head Bolts | Per ISUZU workshop manual |
- Standard Packaging: Anti-rust oil + VCI film + neutral carton
- Custom Packaging: Neutral box, color box, or customer-branded packaging
- Suitable For: Engine overhaul workshops, ISUZU parts distributors, fleet maintenance centers
- Supply Capacity: Stable batch supply with batch-level quality reports
- Minimum Order Quantity: 5 Sets
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