Toyota 13041-75020-05 Bearing, Connecting Rod

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Even, when an engine is overhauled, whereas new main and connecting rod bearings should have been fitted, keeping the old bearings can be of considerable value in determining the state of the engine. Lack of lubber, contamination by dirt and other particle, overloading of the engine and corrosion are main causes of bearing failure and these has to be rectified before fitting of the bearings to avoid further incidences. When inspecting bearings, pull them out of their intended places, and organize them on a clean surface so that possible problems can be related to the crankshaft journal. Foreign material can get into the engine as contaminants during assembly, via the filter, or through machining operations and can become lodged in the bearing material; larger pieces can lead to scoring. Prevention is, therefore, very important and includes constant washing of all parts and replacement of oil and filters. Lubrication break down; may be due to causes such as excessive heat, overloading, leakage of oils, or blocked passages which causes such things as overheating and material extrusion. Other dynamics of the car, for instance, lug the engine or short drives also affects the bearing life adversely by causing oil film breakage and corrosion. Proper installation is important because misunderstanding can cause oil starvation or high spots that cause the product to fail. In case the original bearings are worn or in case the oil clearances are incorrect it is necessary to adhere to some specific steps to choose new bearings mainly if the crankshaft is ground anew, where new bearings with small size are required. For the standard size main bearings, it is recommended to use the same number as the original number and search for the obscured journal grade numbers in the engine block and crankshaft. To arrive at the correct bearing size, these numbers should be matched and for the connecting rod bearings one should use the number stamped on the connecting rod cap. Lastly, the oil clearance is the criterion for selecting new bearings, but in case of some doubts, one may need a dealer's help.

The bearing material may be wiped or extruded from the steel backing, and temperatures can rise to the point where the steel backing turns blue from overheating.

Seek help from a Toyota dealer parts or service department if unsure about which bearings to use.