Cylinder Head Bolts | Isuzu 4HK1 / 4HE1 Engine
The Cylinder Head Bolts for Isuzu 4HK1 and 4HE1 diesel engines are precision-machined fasteners designed to ensure a secure and leak-free connection between the cylinder head and engine block. Manufactured to OEM torque specifications, they provide proper clamping force to maintain consistent compression, prevent head gasket failure, and ensure long-term engine reliability.
Built from high-tensile steel, these bolts are engineered to withstand extreme combustion pressures and heat cycles. Perfect for use during engine rebuilds, head gasket replacements, or maintenance on Isuzu NPR, NQR, and NKR truck engines.
Each set delivers consistent strength, corrosion resistance, and reliability—meeting or exceeding OEM standards for fit and performance.
🔧 Key Features
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✅ OEM-spec Cylinder Head Bolts for Isuzu 4HK1 and 4HE1 engines
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✅ Precision-engineered for accurate torque and tension
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✅ Ensures leak-free cylinder head sealing
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✅ High-tensile steel construction for strength and durability
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✅ Resists heat, corrosion, and vibration
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✅ Ideal for engine rebuilds or head gasket replacement
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✅ Long service life and consistent clamping performance
⚙️ Compatible Applications
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Engine Models: Isuzu 4HK1, 4HE1
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Vehicle Models: Isuzu NPR, NQR, NKR, ELF, and related diesel trucks
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Function: Cylinder Head Fastening / Engine Assembly
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Fitment Type: OEM-spec direct replacement
🌟 Benefits
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Maintains cylinder head alignment and compression integrity
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Prevents oil and coolant leaks from the cylinder head
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Increases engine longevity and reliability
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Ensures proper torque values during reassembly
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Provides OEM-grade fit and performance
FREQUENTLY ASKED QUESTIONS (FAQ)
What do cylinder head bolts do in an Isuzu 4HK1 or 4HE1 engine?
Cylinder head bolts secure the cylinder head to the engine block, maintaining compression and preventing leaks between the combustion chamber, coolant, and oil passages.
Are these head bolts compatible with both Isuzu 4HK1 and 4HE1 engines?
Yes, these OEM-spec bolts are compatible with Isuzu 4HK1 and 4HE1 diesel engines used in NPR, NQR, and other truck models.
Why should I replace cylinder head bolts during a head gasket replacement?
Head bolts stretch slightly during tightening, which can reduce their clamping force over time. Replacing them ensures proper torque and prevents gasket leaks.
What material are these head bolts made from?
These bolts are made from high-tensile steel, providing excellent strength, corrosion resistance, and heat durability.
How should I torque these cylinder head bolts?
Always follow Isuzu’s factory torque specifications and sequence during installation to ensure even compression and secure head sealing.
Can I reuse old head bolts?
Reusing old bolts is not recommended. Always use new OEM-quality bolts to maintain correct torque and prevent gasket failure.
Related products
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4BD2, 4HE1
Clutch Disc 21T | Isuzu 4BD2 / 4HE1 / 1992 – 2004
Durable 21 Tooth Clutch Disc for Isuzu 4BD2 and 4HE1 engines (1992–2004). Provides smooth engagement, consistent torque transfer, and reliable operation under heavy-duty conditions. Perfect OEM-fit replacement for NPR/NQR trucks.
SKU: IEK-434
