The Rod Bearing in the Toyota Avalon is a form of plain bearing that allows the connecting rod to smoothly turn on the crankshaft journal with less metal-to-metal contact. The split upper and lower Rod Bearing inserts are installed in accurately machined saddles in the rod and cap and are designed to produce slight crush when torqued to stay firmly seated. When subjected to pump pressure, the oil flows through holes and grooves cut into the axle and the shaft. Thus, an oil film is created on which the load rotates and prevents direct contact of the two surfaces. The expectation of the Rod Bearing designed by Toyota for the Avalon is to maintain the protective layer even under high load. In many Toyota Avalon engines, this Rod Bearing features steel backing with either bi-metal aluminum alloy or tri-metal copper and lead-tin-copper layers, combining rigidity with surface hardness and fatigue resistance while also having the capacity to embed small debris. The oil clearance in a Toyota engine must be within 0.001 and 0.0035 inches for proper lubrication and heat dissipation. Undersize inserts matched to reground journals can correct excess clearance. Choosing a replacement Rod Bearing for any Avalon necessitates matching size markings to journal dimensions.
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