8973720770 6HK1 Diesel Engine Parts Crankshaft Metal Set

Part number 8973720770 is the original crankshaft bearing kit provided by ISUZU (Isuzu) for the 6HK1 series diesel engine. The kit usually includes a complete set of standard size (STD) main shaft bearings and connecting rod bearings for engine overhaul. Its universal model covers all equipment equipped with 6HK1 engine and is widely used in mainstream 20-22 ton medium-sized hydraulic excavators such as Hitachi ZX200, ZX240, Komatsu PC200, PC220, etc. It is strictly prohibited to mix different brands or grades of bearing shells to avoid poor lubrication, abnormal wear, and even crankshaft locking.

This product is a high-precision bimetallic bearing kit with a silver gray thin-walled part in the shape of a half moon. The substrate (steel back) is made of high-strength low-carbon steel, with a lead bronze or aluminum silicon alloy wear-resistant layer composite on the inner surface, presenting a silver gray luster as shown in the picture. The back of the bearing shell is printed with the part number, standard size identification "STD", and locating lip. D9B "is the material or production batch code. Its working surface has undergone precision machining and plating treatment, with oil storage micro pits that can form a stable oil film with the crankshaft journal under high loads. The standard wall thickness tolerance is strict, ensuring the fit clearance with the cylinder block and connecting rod (usually 0.02-0.08mm), which is the core friction pair to ensure smooth rotation of the crankshaft and withstand alternating impact loads.

Installation specifications (determining the success or failure of major repairs): 1 Cleaning measurement: Before installation, the crankshaft journal and bearing seat hole must be thoroughly cleaned, and the outer diameter micrometer and inner diameter dial gauge must be used to accurately measure and confirm the fit clearance. 2. Directional installation: The positioning lip on the back of the bearing must be accurately inserted into the positioning groove of the cylinder block and connecting rod to prevent rotation. 3. Lubrication and tightening: Apply sufficient assembly oil to the working surface of the bearing shell, use a torque wrench, and tighten the main bearing cap and connecting rod cap bolts in strict accordance with the order, frequency, and torque values specified in the maintenance manual.