ISUZU NPR59 4BD1 Cylinder Head Gasket OEM Fit Multi-Layer Steel 102 mm Bore
| Engine Displacement: | 3,268 Cc (4BC2) / 3,856 Cc (4BD1) | Temperature Range: | −60°C To +180°C |
| Material: | Metal / Graphite / Stainless Steel | Cylinder Head Bolt Torque (Step 1): | 6.0 Kg·m (58.8 N·m / 43.4 Lb·ft) |
| Cylinder Head Bolt Torque (Step 2): | 9.5 Kg·m (93.2 N·m / 68.7 Lb·ft) | Cylinder Head Bolt Torque (Step 3): | 11.5 Kg·m (112.8 N·m / 83.2 Lb·ft) |
| Gasket Bore Diameter: | 102 Mm | Net Weight: | 0.65 Kg |
| High Light: | OEM Fit Cylinder Head Gasket,Multi-Layer Steel Head Gasket,102 mm Bore Engine Gasket |
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Cylinder Head Gasket 8-94145839-0 8941458390 for ISUZU NPR59 ELF 350 4BD1 4BD1T 3.9L — Verified OEM Fit Multi-Layer Steel Head Gasket
This cylinder head gasket is a critical sealing component for the engine combustion chamber, responsible for maintaining compression, separating coolant and oil passages, and ensuring reliable engine performance under all operating conditions.
The cylinder head gasket is compressed between the engine block and cylinder head, forming a critical seal for the combustion chamber. It must withstand combustion pressures exceeding 160 bar while simultaneously sealing coolant passages and oil galleries.
The ISUZU 4BD1 is a 3.9L inline-four direct-injection diesel engine produced from 1980 onwards, widely used in ISUZU ELF/NPR trucks, buses, forklifts, and Hitachi excavators. These engines are known for exceptional durability, routinely exceeding 500,000 km in commercial service with proper maintenance.
- Coolant or oil seepage at the cylinder head joint
- Compression loss between cylinders
- Exhaust gas bubbles in the radiator
- Oil contamination with coolant or vice versa
- Overheating
| Specification | Value |
|---|---|
| Part Number (Short) | 8-94145839-0 |
| Part Number (Long) | 8941458390 |
| Engine Compatibility | 4BD1 / 4BD1T / 4BC2 (3.3L–3.9L) |
| Gasket Bore Diameter | 102 mm |
| Material | Metal / Graphite / Stainless Steel |
| Temperature Range | −60°C to +180°C |
| Net Weight | 0.65 kg |
| Certification | ISO/TS 16949 |
| Step | Torque Value |
|---|---|
| Step 1 | 6.0 kg·m (58.8 N·m / 43.4 lb·ft) |
| Step 2 | 9.5 kg·m (93.2 N·m / 68.7 lb·ft) |
| Step 3 | 11.5 kg·m (112.8 N·m / 83.2 lb·ft) |
| Type | Number |
|---|---|
| Primary OEM — Short | 8-94145839-0 |
| Primary OEM — Long | 8941458390 |
| Consecutive / Replacement | 8-94145839-1 / 8941458391 |
| Consecutive / Replacement | 8-94145839-6 / 8941458396 |
Primary Applications:
| Brand | Model | Engine | Years |
|---|---|---|---|
| ISUZU | ELF 350 | 4BD1 | 1985–1993 |
| ISUZU | ELF 250 | 4BD1 / 4BC2 | 1982–1993 |
| ISUZU | NPR | 4BD1 / 4BD1T | 1986–1993 |
Non-ISUZU Applications:
- Hitachi EX100 / EX100-2 / EX100-3 Excavator
- Hitachi EX120 / EX120-2 / EX120-3 Excavator
- Hitachi EX150 / EX90 / EX90-2 Excavator
- JCB Construction Equipment
Superior sealing under high combustion pressures and thermal cycling
Precision-matched to the 4BD1 / 4BD1T / 4BC2 cylinder bore
Withstands extreme temperatures (−60°C to +180°C)
Direct replacement without modification
- Remove the engine from the vehicle or position it for top-end access
- Remove cylinder head bolts in reverse of tightening sequence
- Check cylinder head and block decks for flatness
- Place new head gasket with TOP mark facing up and FRONT mark forward
- Lower cylinder head onto gasket and lubricate new head bolt threads
- Follow specified torque sequence in three steps
- Install remaining gaskets and seals
- Reconnect all components and refill fluids
- Every 5,000–10,000 km: Change engine oil and filter
- Every 40,000–50,000 km: Inspect for oil or coolant leaks
- Every 100,000 km: Perform compression test
- When overheating occurs: Inspect head gasket immediately
- At engine overhaul: Always replace head gasket and cylinder head bolts
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