Inspection Marks On Bearings

All Caterpillar Engines

There have been some reports about marks on engine bearings in parts shipments. These marks are caused by tools that are used to measure bearing thickness. They do not affect bearing performance or service life in any way.

There are three basic quality control marks found on some bearings. The most common type of mark is two parallel lines near the edges of the bearing, as shown in Illustration 1. Illustration 2 shows another type of mark. There are usually five or six of these marks evenly spaced on the back of the bearing. The third type of quality control mark is shown in Illustration 3. These are short marks which extend in from both edges on the front of the bearing.

Illustration 1.
Illustration 2.
Illustration 3.

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