| CATEGORY | SPECIFICATION |
| Part name | CYLINDER HEAD SCREW(D) |
| Part number | 8970876600 |
| Brand | Isuzu Select Parts |
| Model | NPR |
| Engine model | 4HE1 |
| Packing quantity | 1 pcs |
| Material | Grade 12.9 high-strength alloy steel |
| Weight | About 0.12kg |
| size | M12×115 mm |
| Package | Original ISP packing |
| Delivery time | 5-8 working days |
| Payment Terms | T/T, Western Union, Paypal |
Design Philosophy
High-strength alloy steel cylinder head bolt (Grade 12.9, M12×115mm) cold-forged and heat-treated to maintain continuous structural clamping force under extreme engine compression. Black oxide coating ensures corrosion resistance and reliable sealing in Isuzu 4HE1 diesel engines.
How It Works
Threaded into the engine block through the cylinder head, this bolt clamps the head and gasket against the block. When tightened to specified torque and angle, it stretches elastically to generate clamping force that seals combustion pressure, coolant, and oil passages.
Problems It Solves
Fixes cylinder gasket blowouts, coolant leaks, and compression loss caused by stretched, corroded, or reused head bolts. New bolts restore proper clamping force and ensure reliable combustion sealing in NPR trucks.
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