1. Reduction of the tensile strength of the metal; jagged scratches
2. Incorrectly planted; bright (polished) stripes
3. Scratched with dirt; dirt has eaten into the bearing surface
4. Lack of oil; the top layer has worn off
5. Excessive wear; the top layer has worn off over the entire surface
6. The bearing is deformed; the top layer has worn off in a circle
Even though old bearing shells are replaced with new ones during engine overhaul, it is necessary to carefully inspect the old shells. Inspection of the liner can reveal the cause of its wear.
Bearing failure occurs due to lack of lubrication, the presence of dirt and other foreign particles, engine overload and corrosion. In any case, the cause of bearing damage must be eliminated before starting engine assembly.
To select the correct bearing shell, use the lubrication gap size as a guide, which can be measured using a plastic measuring tape. If you have any problems with the selection of liners, please contact the specialists.
[The text of the article is taken from the website mazbook]