C5290910 XCMG GR2605 motor grader cylinder block reinforcement plate

C5290910 is a cylinder block stiffener plate (also known as a cylinder block reinforcement plate) specifically designed for Cummins ISB, ISD, and QSB series engines. It serves as a critical structural reinforcement component for the bottom of the engine cylinder block. Precision-stamped from high-strength alloy steel plate, and subjected to integral heat treatment and surface anti-rust processing, it features high rigidity, deformation resistance, and fatigue durability. Its primary function is to reinforce the main bearing saddle area of ​​the cylinder block, suppressing vibration and deformation of the block during engine operation. This ensures the coaxiality of the main bearing bores and the operational precision of the crankshaft, while simultaneously sealing the lower oil cavity of the block and assisting in maintaining oil pressure. It is engineered to meet the heavy-duty operational demands of engines with displacements such as 4.5L and 6.7L.

**Technical Specifications**

– **Part Number:** C5290910 (5290910)
– **Type:** Cylinder Block Stiffener Plate / Cylinder Block Reinforcement Plate
– **Material:** High-Strength Structural Alloy Steel
– **Process:** Precision Stamping, Integral Heat Treatment, Surface Phosphating / Black Oxide Anti-Rust Treatment
– **Weight:** Approx. 4.47 kg
– **Structure:** Elongated plate-type structure featuring multiple sets of bearing saddle locating grooves and bolt mounting holes, precisely contoured to match the bottom profile of the cylinder block.
– **Installation Bolt Torque:** 43 ± 5.4 N·m (Tighten in a cross pattern, working outward from the center)
– **Compatible Displacements:** 4.5L, 6.7L
– **Replacement Models:** 4945783, 3965764

**Compatible Engines**

– **ISB Series:** ISB4.5, ISB6.7, ISBe5.9
– **ISD Series:** ISD4.5, ISD6.7
– **QSB Series:** QSB3.9, QSB4.5, QSB5.9, QSB6.7
– **Other Series:** B4.5, B5.9, G5.9, ISF3.8