8976026990 Metal Camshaft Bearing for Isuzu 6HK1

Part number 8976026990 (also commonly written as 8-97602699-0) is an original genuine accessory from Isuzu, specifically designed as a camshaft bearing for the 6HK1 series diesel engine. This engine is widely used in various large and medium-sized construction machinery, mainly suitable for excavators such as Hitachi Construction Machinery's ZX330, ZX350, ZX360H-3G, EX330, etc. This bearing is the core supporting component of the engine valve train, and its universal part number is this number.

This product is a sliding bearing (bushing) for the engine camshaft. Its core function is to support the camshaft, ensuring its precise position and stable lubrication during high-speed rotation and bearing valve spring loads. It is usually made of high-strength steel backed composite wear-resistant alloy layer (such as copper lead alloy or aluminum based alloy). This structure gives it excellent load-bearing capacity, fatigue resistance, and embeddedness, and can adapt to the impact load and small foreign objects of the engine. The original parts ensure extremely high precision in their inner diameter size, wall thickness, oil groove and oil hole position. The surface is covered with anti friction coating to achieve the minimum friction coefficient and optimal oil film formation ability. It is a key component to ensure accurate valve timing and reduce engine noise.

Before installation, it is necessary to use precision measuring tools to measure the diameter and roundness of the camshaft journal, and thoroughly clean the bearing seat hole and the back of the bearing shell to ensure that there are no impurities or oil stains. During installation, pay attention to aligning the positioning lip on the bearing shell with the positioning groove on the seat hole, and tighten the bearing cover bolts in the order and torque specified in the maintenance manual to ensure even clamping force. Daily inspections should be combined with oil analysis. If excessive copper or lead elements are found in the oil, it may indicate abnormal wear of the bearing. Symptoms of malfunction include rhythmic knocking sounds on the upper part of the engine, abnormal decrease in oil pressure, or misalignment of valve opening and closing timing. Once it is confirmed that the wear exceeds the limit, all camshaft bearing shells must be replaced in groups