8981142560 Original Isuzu 4HK1 Engine cylinder head gasket for Excavator 

Part number 8981142560 (also known as 1-87618391-0) is an original cylinder head gasket (also known as cylinder bed) specifically designed for Isuzu 4HK1 series diesel engines. This engine is widely used in multiple Hitachi ZX series hydraulic excavators. According to publicly available accessory information, the main compatible models include Hitachi ZX200-3, ZX210-3, ZX240-3, ZX270-3, etc. In addition, this gasket is also suitable for Sumitomo SH210-5, SH240-5, Case CX210B, Sany SY215/SY225 and other construction machinery equipped with the same 4HK1 engine. This part is a genuine original product, and its universal part number is 8981142560 or 1-87618391-0. It must be verified based on this during procurement.

The cylinder head gasket is the most critical static seal between the engine block and cylinder head. Its core function is to seal the high-temperature and high-pressure gas in the combustion chamber, while preventing oil and coolant from leaking or leaking out of the passage between the cylinder block and cylinder head. As an original component, it is usually made of high-quality multi-layer composite metal materials, which have excellent high temperature resistance, high pressure resistance, and corrosion resistance. It can withstand working temperatures exceeding 300 ° C and pressure differentials up to 10Mpa. Its structural design is precise, and there is usually a metal guard ring around the combustion chamber opening for reinforcement. There is a special sealing coating at the water and oil passage openings to ensure sealing reliability under engine thermal expansion, contraction, and long-term vibration conditions.

The maintenance core of the cylinder head gasket lies in one-time use, standardized installation, and strict torque control. Preparation before installation: The joint surface of the cylinder block and cylinder head must be thoroughly cleaned to ensure that there is no oil, scale, carbon deposits or old sealant residue, and the flatness should be checked with a ruler. Installation specifications: During installation, the gasket should be aligned with the positioning pin and all bolt holes, water channel holes, and oil channel holes, with the side marked with "TOP" or "FRONT" facing upwards. Tightening procedure: A calibrated torque wrench must be used, strictly following the torque values and tightening sequence specified in the original factory maintenance manual (usually diagonally from the center outward), and gradually tightening the cylinder head bolts in 2-3 times.