ISUZU 4HG1 Engine Piston with ALFIN Insert Oil Gallery and High-Silicon Aluminum Alloy OEM 8-97219032-0
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
4HG1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Compression Height: | 60.70 Mm | Oil Ring Groove: | 4.00 Mm × 2.50 Mm |
| Net Weight: | 1.46 Kg | Bore Diameter: | Ø115.00 Mm |
| Combustion Chamber Diameter: | 51 Mm | Piston-to-Liner Clearance: | 0.081–0.116 Mm |
| Piston Overall Height: | 119.50 Mm | Piston Pin Size: | 36 × 79 Mm |
| High Light: | ALFIN Insert Engine Piston,Oil Gallery Piston,High-Silicon Aluminum Alloy Piston |
||
Product Description
ISUZU 4HG1 Engine Piston 8-97219032-0 8972190320 OEM Fit
Engine Piston 8-97219032-0 8972190320 for ISUZU NKR NPR NQR 4HG1 4HG1-T — Verified OEM Fit Ø115 mm Alfin Oil Gallery Piston with Pin
Product Overview
The Engine Piston with OEM numbers 8-97219032-0 and 8972190320 is a verified direct-fit replacement for ISUZU NKR / NPR / NQR / ELF / NPR-HD light and medium-duty trucks equipped with 4HG1 / 4HG1-T diesel engines. This piston is a critical component of the engine's combustion system, responsible for transferring the force of combustion to the crankshaft via the connecting rod while maintaining a gas-tight seal within the cylinder.
Working Principle
The engine piston is the moving component contained within the cylinder, sealed by piston rings. Its primary function is to transfer force from expanding combustion gases to the crankshaft through the connecting rod. The 8-97219032-0 piston features an ALFIN insert — a special austenitic cast iron ring carrier cast into the top ring groove to counteract wear under the extreme pressure and temperature of diesel combustion. The piston also incorporates an oil gallery (cooling channel) that circulates engine oil to reduce piston crown temperature, preventing thermal fatigue and extending service life. The piston crown is anodized to improve heat resistance above 500°C and anti-corrosion properties. The piston skirt is graphite-coated to reduce friction and improve initial running-in efficiency.
Failure Symptoms
Replace the engine piston when any of these symptoms appear:
- Engine knocking or abnormal noise — excessive piston-to-cylinder clearance causes piston slap, especially when the engine is cold
- Excessive oil consumption — worn piston rings or damaged ring grooves allow oil to enter the combustion chamber
- Blue or white exhaust smoke — oil burning in the combustion chamber produces blue smoke; white smoke indicates unburned fuel or coolant ingress
- Loss of compression and power — worn piston rings or a damaged piston crown reduce compression pressure, causing power loss and hard starting
- Visible cracks, scuffing, or melting on the piston crown — overheating or detonation can cause catastrophic piston damage
- Metal debris in the oil pan — piston skirt scuffing or ring land failure produces metal particles that contaminate the engine oil
Critical Inspection Note: ISUZU service manuals require that pistons be replaced as a complete set of four to maintain balanced compression across all cylinders. Always measure the cylinder liner bore and piston clearance before installation — the specified piston-to-liner clearance for the 4HG1 is 0.081–0.116 mm. Inspect the piston ring grooves for wear and replace rings as a set. Use new piston pin snap rings during assembly.
Technical Specifications
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-97219032-0 | ISUZU OEM Parts Database |
| Part Number (Long) | 8972190320 | ISUZU OEM Parts Database |
| Part Name | PISTON; ENGINE | ISUZU EPC |
| Vehicle Models | ISUZU NKR / NPR / NQR / ELF / NPR-HD | ISUZU application catalog |
| Engine Compatibility | 4HG1 / 4HG1-T (4.57L, 4-cylinder, DI) | ISUZU application catalog |
| Bore Diameter | Ø115.00 mm | Agenuine JIUP115AO-46 specification |
| Piston Overall Height (GL) | 119.50 mm | JW Patent specification |
| Compression Height (KH) | 60.70 mm | Agenuine specification |
| Piston Pin Size | 36 * 79 mm | Agenuine specification |
| Combustion Chamber Diameter (M Dia) | 51 mm | JW Patent specification |
| Ring Groove 1 | 3.00 mm (HK) * 4.10 mm | Agenuine specification |
| Ring Groove 2 | 2.50 mm * 4.80 mm | Agenuine specification |
| Ring Groove 3 (Oil Ring) | 4.00 mm * 2.50 mm | Agenuine specification |
| Material | High-Silicon Aluminum Alloy | Product specification |
| Piston Type | ALFIN Insert + Oil Gallery + Tin/Graphite Coated | Product specification |
| Net Weight (per unit) | 1.46 kg | French Autopart-Masters specification |
| Piston-to-Liner Clearance | 0.081–0.116 mm | ISUZU workshop manual |
| Certification | ISO/TS 16949 | Third-party system audit |
OEM Cross-Reference
| Type | Number |
|---|---|
| Primary OEM — Short | 8-97219032-0 |
| Primary OEM — Long | 8972190320 |
| Alternate Format | 8-97219-032-0 / 8-97219-0320 |
| Consecutive / Replacement | 8-97183-666-0 / 8971836660 |
| Consecutive / Replacement | 8-97221-484-0 / 8972214840 |
| Related OEM | 8-98209-745-0 / 8982097450 |
| Related OEM | 8-97219032-1 / 8972190321 |
| Related OEM | 8-97105-867-0 / 8971058670 (Ring Set) |
| Competitive Cross-Reference | IZUMI IZ05-M004E, Yenmak 8972190320, ROYBUS 8972190320, BZLP 8972190320, TEIKIN 39676AG STD |
Product Details
| Part Number: | 8-97219032-0 8972190320 | Product Name: | Piston |
| Car Model: | 4HG1 | Engine Model: | 4HG1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It As Requested | ||
| Material: | High-strength aluminum alloy & precision bearings | ||
| Cooling Type: | Engine coolant circulation | Installation: | Direct OEM replacement |
| Quality Standard: | OEM equivalent / ISO quality control | ||
Vehicle & Engine Compatibility
Primary Applications
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | NKR | NKR66 / NKR71 / NKR77 | 4HG1 / 4HG1-T | 1994–2016 |
| ISUZU | NPR | NPR66 / NPR70 / NPR71 / NPR75 | 4HG1 / 4HG1-T | 1994–2016 |
| ISUZU | NQR | NQR70 / NQR71 / NQR75 | 4HG1 / 4HG1-T | 1998–2016 |
| ISUZU | ELF | N-Series | 4HG1 / 4HG1-T | 1994–2016 |
| ISUZU | NPR-HD | NPR-HD | 4HG1 | 1999–2010 |
| ISUZU | NPS | NPS | 4HG1 | 2000s–2010s |
Non-ISUZU Applications (Same Platform):
| Brand | Model | Application |
|---|---|---|
| Chevrolet | W3500 / W4500 | Light Truck |
| GMC | W3500 / W4500 | Light Truck |
| Bogdan | A-091 / A-092 | Light Truck |
Important Fitment Notes:
- This piston is designed for the 4HG1 / 4HG1-T engine family with a Ø115.00 mm bore. Confirm your engine model before ordering
- The 8-97183-666-0 and 8-97221-484-0 are interchangeable OEM numbers for the same application. The 8-98209-745-0 is a later production replacement
- The 8-97105-867-0 piston ring set is a recommended companion purchase for a complete piston replacement
- Always measure the cylinder liner bore and piston clearance before installation. The specified piston-to-liner clearance for the 4HG1 is 0.081–0.116 mm
- Pistons should be replaced as a complete set of four to maintain balanced compression
- For right-hand drive (RHD) vehicles, verify clearance and orientation. Refer to the ISUZU workshop manual for the correct procedure
Fitment Verification: To ensure 100% accurate matching, please provide the VIN or chassis number before ordering. We will verify it through the ISUZU global EPC system.
Features & Benefits
| Feature | Benefit + Verification Signal |
|---|---|
| ALFIN Insert in Top Ring Groove | Special austenitic cast iron ring carrier counteracts wear under extreme diesel combustion pressure — verified by product specification |
| Oil Gallery (Cooling Channel) | Circulates engine oil to reduce piston crown temperature, preventing thermal fatigue — verified by product specification |
| Anodized Piston Crown | Improves heat resistance above 500°C and anti-corrosion properties — verified by product specification |
| Graphite-Coated Skirt | Reduces friction and improves initial running-in efficiency — verified by product specification |
| High-Silicon Aluminum Alloy | Provides excellent thermal stability and wear resistance under heavy-duty diesel operation — verified by material certificate |
| OEM-Exact Ø115.00 mm Bore | Precision-matched to the ISUZU 4HG1 cylinder liner — direct drop-in fit without modification — verified by CMM dimensional inspection |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified |
Quality Control & Verification
| QC Item | Verification Method / Standard |
|---|---|
| Bore Diameter (Ø115.00 mm) | CMM, 100% inspection |
| Compression Height (60.70 mm) | CMM, 100% inspection |
| Piston Overall Height (119.50 mm) | CMM, 100% inspection |
| Piston Pin Bore (36 mm) | CMM, 100% inspection |
| Ring Groove Dimensions | CMM, 100% inspection |
| Combustion Chamber Diameter (51 mm) | CMM, 100% inspection |
| Material Composition | Spectrometer analysis, batch sampling |
| Crown Hardness (Anodized) | Hardness tester, batch sampling |
| ALFIN Insert Bonding | Ultrasonic inspection, 100% inspection |
| Oil Gallery Flow Test | Flow test, 100% inspection |
| Surface Finish | Visual inspection — no cracks, no porosity, no scuffs |
| Batch Traceability | Material lot number + production date |
| Packaging Protection | Anti-rust oil + VCI film + carton |
Installation & Maintenance Recommendations
IMPORTANT: Piston installation is an engine overhaul-level operation. It must be performed by a qualified diesel engine technician in a clean workshop. Always measure the cylinder liner bore and piston clearance before assembly. Never reuse old piston pins or snap rings.
Installation Guidelines — Reference ISUZU 4HG1 Workshop Manual
- Preparation: Remove the cylinder head and oil pan. Disconnect the connecting rod caps and withdraw the piston and rod assemblies from the top of the cylinder block
- Disassembly: Remove the piston pin snap rings. Press the piston pin out using a proper pin press. Separate the piston from the connecting rod
- Inspection: Inspect the cylinder liner bore for wear, scoring, or taper. Measure the bore diameter and compare to specification. Inspect the connecting rod small end bushing for wear
- Preparation for New Piston: Clean the new piston thoroughly. Install new piston rings onto the piston using a ring expander. Ensure the ring gaps are positioned correctly (typically 120° apart)
- Piston Pin Installation: Lubricate the piston pin and connecting rod small end bushing with clean engine oil. Install the piston pin and new snap rings
- Clearance Check: Measure the piston-to-liner clearance using a feeler gauge. Verify the clearance is within the specification of 0.081–0.116 mm
- Installation: Install the piston and rod assembly into the cylinder liner using a ring compressor. Ensure the piston orientation mark (arrow or "FRONT") faces the front of the engine
- Final Assembly: Install the connecting rod cap. Tighten the rod bolts to specification. Install the cylinder head and oil pan. Refill with fresh engine oil and coolant
- Road Test: Start the engine and check for abnormal noise or smoke. Perform a road test to verify proper operation
Recommended Torque Values:
| Fastener | Torque |
|---|---|
| Connecting Rod Bearing Bolts | Per ISUZU workshop manual specification |
| Cylinder Head Bolts | Per ISUZU workshop manual specification |
| Piston-to-Liner Clearance | 0.081–0.116 mm |
Maintenance Schedule
- Every 5,000–10,000 km: Change engine oil and filter. Check oil pressure
- Every 40,000–50,000 km: Perform oil analysis to detect piston wear metals (aluminum, iron)
- Every 100,000 km: Perform compression test to monitor piston ring sealing
- At engine overhaul: Always replace pistons, rings, and pin snap rings as a complete set
- When abnormal noise or smoke is detected: Inspect pistons immediately. Replace if worn or damaged
Packaging & Supply
- 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 available
- Minimum Order Quantity: 4 PCS (complete set for 4-cylinder engine)
RELATED PRODUCTS
Engine Block 5873102680 5-87310268-0 For ISUZU 100P 4JB1 Diesel Engine Parts
Engine Block 5873102680 5-87310268-0 For ISUZU 100P 4JB1 Diesel Engine Parts Part Number: 5873102680 5-87310268-0 Product Name: Engine Block Car Model: ISUZU 100P Engine Model: ISUZU 4JB1 Condition: 100% Brand New Size: Standard Weight: Standard Origin: China Mainland Main Market: Middle East ,Asia...
Engine Overhaul Gasket Kit 5-87811868-1 5878118681 For ISUZU NPR 4HF1
High-quality Engine Overhaul Gasket Kit 5-87811868-1 for ISUZU NPR trucks equipped with 4HF1 engine. Complete OEM-equivalent gasket set designed for full engine overhaul and long-term sealing performance. Part Number: 5-87811868-1 5878118681 Product Name: Engine Overhaul Gasket Kit Car Model: ISUZU ...
Cylinder Liner Kit 5-87810143-1 5878101431 For ISUZU FSR 6BF1
High-quality Cylinder Liner Kit 5-87810143-1 for ISUZU FSR trucks equipped with the 6BF1 engine. OEM-equivalent replacement designed to restore engine performance and extend service life. Part Number: 5-87810143-1 5878101431 Product Name: Cylinder Liner Kit Car Model: ISUZU FSR Engine Model: ISUZU ...
Water Pump Assembly With Gasket for ISUZU NPR59 4BC2 8970211711 8-97021171-1
Water Pump Assembly With Gasket for ISUZU NPR59 4BC2 8970211711 8-97021171-1 Part Number: 8970211711 8-97021171-1 Product Name: Water Pump Assembly Car Model: ISUZU NPR59 Engine Model: ISUZU 4BC2 Condition: 100% Brand New Size: Standard Weight: Standard Origin: China Mainland Main Market: Middle ...
