8-97105872-0 OEM Fit Cylinder Head Gasket 113.5 mm Bore MLS Head Gasket for ISUZU 4HF1
| Bore Diameter: | 113.5 Mm | Thickness: | 1.75 Mm (variants: 1.50 / 1.80 / 2.10 Mm) |
| Material: | Multi-Layer Steel (MLS) / Metal Composite | Cylinders: | 4 |
| Engine Compatibility: | 4HF1 / 4HF1-O | Installation Position: | Between Cylinder Block And Cylinder Head |
| Combustion Pressure: | Exceeding 160 Bar | OEM Part Number: | 8-97105872-0 / 8971058720 |
| High Light: | 8-97105872-0 OEM Fit Cylinder Head Gasket,113.5 mm Bore Head Gasket,MLS Cylinder Head Gasket |
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Cylinder Head Gasket 8-97105872-0 / 8971058720 for ISUZU NPR, NKR and NPS trucks with the 4HF1 engine — a verified OEM-fit, 113.5 mm bore Multi-Layer Steel (MLS) head gasket engineered for dependable combustion, coolant and oil sealing.
The 8-97105872-0 head gasket is a verified direct-fit replacement for ISUZU NPR66 / NKR66 / NPS66 / NQR / NKS series trucks equipped with 4HF1 / 4HF1-O diesel engines. As the core sealing component of the combustion chamber sealing system, it is installed between the cylinder block and cylinder head, sealing the combustion chamber, coolant passages and oil galleries to maintain correct engine compression, cooling and lubrication.
The cylinder head gasket is compressed between the engine block and cylinder head, forming a static seal for the combustion chamber, coolant passages and oil galleries. It must withstand combustion pressures exceeding 160 bar while compensating for minor deformation of the block and head during thermal cycling. The 8-97105872-0 gasket uses a Multi-Layer Steel (MLS) construction, achieving reliable sealing through the elastic deformation of multiple thin steel layers and surface coatings. Compared with traditional asbestos or composite gaskets, MLS offers higher pressure resistance, heat resistance and creep resistance. The 4HF1 is a 4.3L inline-four diesel engine with a 113.5 mm bore, widely used in ISUZU NPR/NKR series trucks and Hitachi construction equipment.
Replace the head gasket when any of the following symptoms appear:
- Coolant or oil seepage at the cylinder head joint — visible fluid traces along the head-to-block mating surface, or white exhaust smoke (coolant entering the combustion chamber).
- Compression loss between cylinders — a blown head gasket allows compression to leak between adjacent cylinders, causing misfiring, rough idle and power loss.
- Exhaust gas bubbles in the radiator — combustion gases entering the cooling system through a failed head gasket, pressurizing the coolant hoses.
- Oil contamination with coolant or vice versa — milky emulsion in the oil or oil slicks in the coolant.
- Overheating — combustion gases in the cooling system cause localized hot spots and persistent overheating.
- Visible burning, cracking or delamination on the gasket — sealing beads burned or MLS layers separated upon inspection.
⚠️ Critical Inspection Note: ISUZU service manuals require that the cylinder head gasket be replaced, never reused, when the cylinder head is removed. Check block and head flatness and clean all mating surfaces before installation.
Cylinder head bolts must be torqued in the specified sequence (4HF1 cylinder head bolt base torque approximately 2.0–2.4 kgf·m, combined with angle tightening — confirm with the workshop manual). After installation, adjust valve clearance to specification (cold intake approximately 0.25–0.30 mm, exhaust approximately 0.45–0.50 mm) and bleed the cooling system thoroughly.
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-97105872-0 | OKISUZU; Spanish Isuzu-Truckspares |
| Part Number (Long) | 8971058720 | OKISUZU; Futurenowinc |
| Official Part Name | GKT;CYL,HD | OKISUZU |
| Vehicle Models | ISUZU NPR66 / NKR66 / NPS66 / NQR / NKS | Brett's Truck Parts; QC Qicheng |
| Engine Compatibility | 4HF1 / 4HF1-O | Multilingual product pages |
| Bore Diameter | 113.5 mm | Everychina product page |
| Thickness | 1.75 mm (variants 1.50 / 1.80 / 2.10 mm) | OKISUZU; Spanish product page; King Auto Parts |
| Material | Multi-Layer Steel (MLS) / Metal Composite | Brett's Truck Parts; Spanish product page |
| Cross-Reference OEM | 8-97105-871-0 / 8971058710 | Multilingual product pages |
| Cross-Reference OEM | 8-97107-567-0 / 8971075670 | QC Qicheng; Diesel-dv |
| Cross-Reference OEM | 8-97048-348-0 / 8970483480 | QC Qicheng; Brett's Truck Parts |
| Cross-Reference OEM | 8-97017-444-0 / 8970174440 | QC Qicheng |
| Cross-Reference OEM | 8-97044-061-0 / 8970440610 | QC Qicheng |
| Certification | ISO/TS 16949 | Third-party system audit |
| Warranty | 12 Months | Manufacturer standard |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR66 | 4HF1 | 1994–2002 |
| ISUZU | NPR | NPR66 | 4HF1 | 1991–2002 |
| ISUZU | NPS | NPS66 | 4HF1 | 1993–1998 |
| ISUZU | NQR | NQR | 4HF1 | 1996–2000s |
| ISUZU | NKS | NKS | 4HF1 | 1990s–2000s |
| Brand | Model | Application |
|---|---|---|
| Hitachi | ZX200 series | Excavator |
| Others | Construction equipment with 4HF1 engine | — |
⚠️ Important Fitment Notes:
- This head gasket is designed for 4HF1 / 4HF1-O engines with a 113.5 mm bore. Confirm your engine model and original gasket thickness before ordering.
- The 8-97105872-0 is the primary OEM number. The 8-97105-871-0, 8-97107-567-0, 8-97048-348-0, 8-97017-444-0 and 8-97044-061-0 are cross-reference numbers for the same application. Verify against your original component.
- Thickness note: 4HF1 head gaskets are available in 1.50 mm, 1.75 mm, 1.80 mm and 2.10 mm specifications. The correct thickness must be selected based on the original gasket or the cylinder head/block resurfacing amount — incorrect thickness will affect compression ratio and valve timing.
- Check block and head flatness and clean all mating surfaces before installation.
- Cylinder head bolts must be torqued to specification with angle tightening; new bolts are recommended.
- Adjust valve clearance and bleed the cooling system thoroughly after installation.
- For right-hand drive (RHD) vehicles, verify installation 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.
| Feature | Benefit + Verification Signal |
|---|---|
| Multi-Layer Steel (MLS) Construction | Higher pressure resistance, heat resistance and creep resistance compared with traditional composite gaskets, maintaining stable sealing under high combustion pressure and thermal cycling — verified by Brett's Truck Parts specification. |
| 113.5 mm Precision Bore | Exact match to 4HF1 cylinder bores for correct sealing bead positioning — verified by Everychina product page bore data. |
| 1.75 mm Standard Thickness | Matches most 4HF1 original applications, with 1.50 / 1.80 / 2.10 mm variants available for different resurfacing amounts — verified by OKISUZU and multilingual product pages. |
| Metal Composite Surface Coating | Improves micro-sealing performance, compensating for minor surface irregularities of the block and head — verified by Spanish product page "Compuesto del metal; Elastico" description. |
| Wide Vehicle Compatibility | Covers ISUZU NPR66, NKR66, NPS66, NQR, NKS and Hitachi ZX200 series — verified by Brett's Truck Parts and QC Qicheng application data. |
| ISO/TS 16949 Certified | Full traceability with material certificates and batch inspection reports — third-party system audit. |
| QC Item | Verification Method / Standard |
|---|---|
| Bore Diameter (113.5 mm) | CMM, 100% inspection |
| Thickness (1.75 mm etc.) | Micrometer, 100% inspection |
| Sealing Bead Height & Width | CMM / profilometer, 100% inspection |
| Interlayer Bond Strength | Peel test, batch sampling |
| Surface Coating Thickness | Coating thickness gauge, batch sampling |
| Material Composition | Spectrometer analysis, batch sampling |
| Compression & Recovery | Compression tester, batch sampling |
| Coolant / Oil Resistance | ASTM D471 immersion test, batch sampling |
| Surface Finish | Visual inspection — no cracks, no delamination, no contamination |
| Batch Traceability | Material lot number + production date |
| Packaging Protection | Sealed bag + moisture barrier + carton |
⚠️ IMPORTANT: Engine overhaul is a professional-level operation. It must be performed by a qualified diesel engine technician in a clean workshop. The head gasket must be replaced, never reused. New cylinder head bolts are recommended.
- 1Preparation: Drain coolant and oil. Remove the cylinder head and associated lines. Thoroughly clean the block and head mating surfaces, removing old gasket residue, carbon and oil.
- 2Inspection: Check block and head flatness (straightedge + feeler gauge). Inspect the head for cracks. Measure liner protrusion (if applicable).
- 3Gasket Installation: Place the new gasket on the block dowels, observing the TOP / FRONT markings. Confirm the thickness matches the original component.
- 4Cylinder Head Installation: Carefully lower the head. Apply clean oil to bolt threads. Tighten the head bolts in the specified sequence in stages (base torque approximately 2.0–2.4 kgf·m, with angle tightening).
- 5Valvetrain Installation: Install the rocker shaft, push rods, etc. Adjust cold valve clearance to specification (intake approximately 0.25–0.30 mm, exhaust approximately 0.45–0.50 mm).
- 6Final Assembly: Refill with fresh coolant and oil. Bleed the cooling system thoroughly.
- 7Road Test: Start the engine and check for leaks, abnormal noise or exhaust smoke. Perform a road test.
| Fastener | Torque |
|---|---|
| Cylinder Head Bolts (Base) | Approx. 2.0–2.4 kgf·m (confirm with workshop manual; includes angle tightening) |
| Valve Clearance (Cold) | Intake 0.25–0.30 mm / Exhaust 0.45–0.50 mm |
- Every 10,000 km: Check coolant level and condition. Inspect for external leaks.
- Every 40,000–50,000 km: Inspect head joint for seepage. Check valve clearance.
- After any overheating event: Inspect head gasket sealing immediately (compression test, cooling system pressure test).
- At engine overhaul: Always replace the head gasket and cylinder head bolts.
- Standard Packaging: Sealed bag + moisture barrier + neutral carton.
- Custom Packaging: Neutral box, color box or customer-branded packaging.
- Suitable For: Engine repair shops, ISUZU parts distributors, fleet maintenance centers and construction equipment repair shops.
- Supply Capacity: Stable batch supply with batch-level quality reports available.
- MOQ: Small quantities accepted (quantity discounts available).
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