The lapping material and oil mix is spread with a brush over the
babbitt bearing surface of one bearing at a time. The other bearing
surfaces are coated with oil so they don’t get dry.In this instance, the lapping compound is mixed with oil, per the
instructions on the container, to make the compound like a gritty
lubricant. That lubricant-like lapping compound is spread on the babbitt
bearings, and then the moving part is put into position and turned (in
this case, the part is the crankshaft or camshaft). The lapping compound
takes away the high areas on the bearing to make the surface smoother.
The accompanying photographs show the lapping process on the A-
400 engine’s crankshaft bearings. Detailed information, including
measurements and warnings, can be found in the product’s instructions.
Be sure to follow these instructions carefully to prevent damaging engine
components.
SOURCE:
Metal Crafters
2701 Chamber St., Stevens Point, WI
715-341-3461