ISUZU NPR 4HG1 Cylinder Liner 8-97351558-0 OEM Fit Boron Alloy Cast Iron with Phosphate Coating Dry Type
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
NPR 4HG1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Inner Diameter: | Ø115 Mm | Liner Type: | DRY (Flange Flange / FF) |
| Flange Outer Diameter: | Ø123.7 Mm | Net Weight: | 0.75 Kg |
| Piston-to-Liner Clearance: | 0.081–0.116 Mm | Material: | Boron Alloy Cast Iron |
| Outer Diameter: | Ø118 Mm | Overall Length: | 180 Mm |
| High Light: | Boron Alloy Cast Iron Cylinder Liner,Phosphate Coating Cylinder Sleeve,Dry Type Engine Liner |
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Product Description
ISUZU NPR 4HG1 Cylinder Liner 8-97351558-0 8973515580 OEM Fit
Cylinder Liner 8-97351558-0 8973515580 for ISUZU NPR NQR NKR 4HG1 4HG1-T — Verified OEM Fit Ø115*118*180 mm Dry Type Cylinder Sleeve with Flange
Product Overview
The Cylinder Liner with OEM numbers 8-97351558-0 and 8973515580 is a verified direct-fit replacement for ISUZU NPR / NQR / NKR / NPR71 / NQR71 / NPS / ELF / CXZ light and medium-duty trucks and Bogdan A-091 / A-092 buses equipped with 4HG1 / 4HG1-T diesel engines. This cylinder liner is a critical component of the engine's combustion system, responsible for forming the cylinder bore in which the piston reciprocates, providing a durable wear surface for the piston rings, and transferring combustion heat to the engine cooling system.
Working Principle
The cylinder liner (also called cylinder sleeve) is a cylindrical component installed in the engine block to form the cylinder bore. In the 4HG1 engine, the liner is of the dry type — meaning the outer wall does not contact engine coolant directly. Instead, the liner is press-fitted into the engine block bore, and cooling is achieved through the block's water jacket surrounding the liner. This design allows for a thinner liner wall, better block rigidity, and reduced risk of coolant leaks compared to wet liners. The liner must withstand combustion pressures exceeding 160 bar, provide a wear-resistant surface for the piston rings, and transfer heat efficiently to maintain proper engine operating temperatures. The 4HG1 is a 4.57L inline-four direct-injection diesel engine producing approximately 121 HP, widely used in ISUZU NPR/NQR trucks from 1994 to 2016. The liner features a phosphate coating on the outer surface to improve press-fit retention and corrosion resistance during service.
Failure Symptoms
Replace the cylinder liner when any of these symptoms appear:
- Excessive oil consumption / blue exhaust smoke — worn liner-to-ring clearance allows oil into the combustion chamber.
- Loss of compression and power — a worn or scored liner reduces cylinder sealing, causing power loss, hard starting, and rough idle.
- Cylinder wall scoring (scuffing) — foreign objects, snapped snap rings, or overheating can scratch the liner bore, producing vertical grooves.
- Piston slap or knocking noise — excessive liner-to-piston clearance causes the piston to rock in the bore, especially when cold.
- Overheating — a cracked or deformed liner can reduce heat transfer efficiency, causing localized hot spots.
- Metal debris in the oil pan — liner wear particles contaminate the engine oil and accelerate wear of other components.
⚠️ Critical Inspection Note: ISUZU service manuals require that cylinder liners be replaced as a complete set of four to maintain balanced compression across all cylinders. The 4HG1 cylinder liner is available in multiple service grades (1X, 2X, 3X) corresponding to the engine block bore grade. Measure the block bore diameter before ordering to select the correct liner grade. Grade mismatch will cause abnormal liner protrusion or distortion. After pressing the liner in, measure liner protrusion with a dial indicator and verify it is within specification. Phosphate-coated liners are recommended for improved press-fit retention.
Technical Specifications
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-97351558-0 | ISUZU OEM Parts Database |
| Part Number (Long) | 8973515580 | ISUZU OEM Parts Database |
| Part Name | CYLINDER LINER (Cylinder Sleeve) | ISUZU EPC |
| Engine Compatibility | 4HG1 / 4HG1-T (4.57L, 4-cylinder, DI) | ISUZU application catalog |
| Inner Diameter | Ø115 mm | Gasgoo specification; JW Patent specification |
| Outer Diameter | Ø118 mm | Gasgoo specification |
| Flange Outer Diameter | Ø123.7 mm | JW Patent specification |
| Overall Length | 180 mm | Gasgoo specification; JW Patent specification |
| Liner Type | DRY (Flange Flange / FF) | JW Patent specification |
| Material | Boron Alloy Cast Iron | Product specification |
| Surface Treatment | Phosphate Coating | Product specification |
| Net Weight (per unit) | 0.75 kg | Bossgoo specification |
| Service Grades Available | 1X / 2X / 3X (match block bore grade) | ISUZU workshop manual |
| Piston-to-Liner Clearance | 0.081–0.116 mm | ISUZU 4HG1 workshop manual |
| Certification | ISO/TS 16949 | Third-party system audit |
OEM Cross-Reference
| Type | Number |
|---|---|
| Primary OEM — Short | 8-97351558-0 |
| Primary OEM — Long | 8973515580 |
| Consecutive / Replacement | 8-97144-178-0 / 8971441780 |
| Consecutive / Replacement | 8-97176-729-0 / 8971767290 |
| Consecutive / Replacement | 8-97351-558-1 / 8973515581 |
| Consecutive / Replacement | 8-97351-559-0 / 8973515590 |
| Consecutive / Replacement | 8-98014048-0 / 8980140480 |
| Consecutive / Replacement | 8-98014048-1 / 8980140481 |
| Related OEM (Bogdan) | 8-813352-1 |
Vehicle & Engine Compatibility
Primary Applications
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR | NPR66 / NPR70 / NPR71 / NPR75 | 4HG1 / 4HG1-T | 1994–2016 |
| ISUZU | NQR | NQR70 / NQR71 / NQR75 | 4HG1 / 4HG1-T | 1996–2016 |
| ISUZU | NKR | NKR66 / NKR71 / NKR77 | 4HG1 / 4HG1-T | 1994–2007 |
| ISUZU | NPS | NPS | 4HG1 | 1994–2016 |
| ISUZU | ELF | N-Series | 4HG1 / 4HG1-T | 1994–2016 |
| ISUZU | CXZ | CXZ | 4HG1 | 1990s–2000s |
Non-ISUZU Applications (Same Platform):
| Brand | Model | Application |
|---|---|---|
| Bogdan | A-091 / A-092 | Bus |
| Chevrolet | W3500 / W4500 | Light Truck |
| GMC | W3500 / W4500 | Light Truck |
⚠️ Important Fitment Notes:
- This cylinder liner is designed for the 4HG1 / 4HG1-T engine family with a Ø115 mm bore. Confirm your engine model before ordering.
- The 8-97144-178-0, 8-97176-729-0, 8-97351-558-1, 8-97351-559-0, 8-98014048-0, and 8-98014048-1 are interchangeable OEM numbers for the same application.
- The 8-813352-1 is the Bogdan A-091 / A-092 bus application reference number.
- CRITICAL: The 4HG1 cylinder liner is available in multiple service grades (1X, 2X, 3X). Measure the block bore diameter before ordering to select the correct grade. Grade mismatch will cause abnormal liner protrusion or distortion.
- Always measure liner protrusion after installation and verify it is within the workshop manual specification.
- Pistons and rings should be replaced together with the liner for optimal results.
- 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 |
|---|---|
| Dry Type (FF) Design | Thinner liner wall, better block rigidity, and reduced risk of coolant leaks compared to wet liners — verified by JW Patent specification (DRY, Flange Flange type). |
| Ø115 mm Bore * 180 mm Length | Precision-matched to the ISUZU 4HG1 cylinder block — direct press-fit installation — verified by Gasgoo specification and CMM dimensional inspection. |
| Boron Alloy Cast Iron Construction | Excellent wear resistance and thermal stability under heavy-duty diesel operation — verified by product specification and material certificate. |
| Phosphate Coating | Improved press-fit retention and corrosion resistance for extended service life — verified by product specification. |
| Precision-Ground Bore Surface | Ensures proper piston ring seating and oil film formation — verified by CMM dimensional inspection. |
| Multiple Service Grades (1X / 2X / 3X) | Accommodates different block bore wear conditions for precise fitment — verified against ISUZU workshop manual specifications. |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified. |
| Installation Success Rate ≥ 99% | Based on repair order tracking — confirms reliable fitment across the 4HG1 platform. |
Quality Control & Verification
| QC Item | Verification Method / Standard |
|---|---|
| Inner Diameter (Ø115 mm) | CMM, 100% inspection |
| Outer Diameter (Ø118 mm) | CMM, 100% inspection |
| Flange Diameter (Ø123.7 mm) | CMM, 100% inspection |
| Overall Length (180 mm) | CMM, 100% inspection |
| Bore Roundness & Taper | Roundness tester, 100% inspection |
| Surface Hardness | Rockwell hardness tester, batch sampling |
| Material Composition | Spectrometer analysis, batch sampling |
| Phosphate Coating Thickness | Coating thickness gauge, batch sampling |
| Bore Surface Finish (Ra) | Surface roughness tester, 100% inspection |
| Flange Flatness | Surface plate + feeler gauge, 100% inspection |
| Crack Detection | Magnetic particle inspection (MT), 100% inspection |
| Batch Traceability | Material lot number + production date |
| Packaging Protection | Anti-rust oil + VCI film + carton |
Installation & Maintenance Recommendations
⚠️ IMPORTANT: Cylinder liner installation is an engine overhaul-level operation. It must be performed by a qualified diesel engine technician in a clean workshop. Measure the block bore diameter and select the correct liner grade (1X / 2X / 3X) before ordering. Thoroughly clean the block bore before installation. Never reuse old liners.
Installation Guidelines — Reference ISUZU 4HG1 Workshop Manual
- Preparation: Remove the cylinder head and oil pan. Disassemble the engine and remove the old pistons and connecting rods. Clean the engine block thoroughly.
- Block Inspection: Measure the block bore diameter with a cylinder bore gauge. Compare to specification to determine the correct liner grade (1X, 2X, or 3X). Inspect the block bore for scoring, corrosion, or distortion.
- Liner Selection: Select the matching liner grade according to the block bore grade. Grades must match. Verify the liner dimensions against the original component.
- Block Cleaning: Clean the block bore thoroughly to remove all carbon, scale, and old sealant residue. Wipe with a lint-free cloth.
- Liner Installation: Apply a thin coat of clean engine oil or dedicated liner installation lubricant to the liner outer surface. Use a dedicated pressing tool to press the liner into the block bore vertically. Do not hammer.
- Protrusion Measurement: After pressing, measure liner protrusion with a dial indicator. Verify it is within the workshop manual specification.
- Piston & Ring Installation: Install new pistons and rings into the liners. Verify the piston-to-liner clearance is within 0.081–0.116 mm. Ensure ring gaps are positioned correctly (typically 120° apart).
- Final Assembly: 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 |
|---|---|
| Cylinder Head Bolts | Per ISUZU workshop manual specification |
| Connecting Rod Bearing 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 liner wear metals (iron, chromium).
- Every 100,000 km: Perform compression test to monitor cylinder sealing.
- At engine overhaul: Always replace liners as a complete set of four with new pistons and rings.
- When blue smoke or oil consumption is detected: Inspect cylinder liners immediately. Replace if worn or scored.
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, bus fleet operators.
- Supply Capacity: Stable batch supply with batch-level quality reports available.
- Minimum Order Quantity: 4 PCS (complete set for 4-cylinder engine)
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