Main and connecting rod bearings — check

1. Used bearings should be stored at their place of installation for a thorough inspection, as wear marks on these parts allow the general condition of the engine to be restored (see photo).



2. Causes of failure of crankshaft bearings are insufficient lubrication, the presence of dirt and foreign particles, engine overload and corrosion. Regardless of the cause that caused the destruction of the bearings, it must be eliminated before the final assembly of the engine (see photo).



3. Get bearings from the block of cylinders and lay out loose leaves on a pure surface in an order of their installation. To prevent accelerated wear due to contamination, keep the engine assembly clean. During operation, it is recommended to change the oil and filters more often.


4. In case of insufficient lubrication, the bearing coating material is wiped off the steel base, the bearing is chipped from overheating (there is a bluish tint).

5. When driving in heavy engine conditions (wide open throttle, or low speed in high gear) there is a detachment of the bearing coating from the steel base in the form of small particles, the bearings are subjected to fatigue wear.

6. Frequent trips over short distances can cause corrosive wear of bearings, because due to insufficient warming up, condensed moisture does not have time to be removed.

7. Incorrect installation of bearings during assembly also leads to premature wear. If the clearance in the bearings is less than normal, then their lubrication is difficult, which leads to wear as well as due to "oil starvation".