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Babbitt Bearing Tips


| November/December 1974

You can pour a connecting rod bearing by the same procedure. However, I would remove the rod and use a piece of shafting same size as the throw part of the crankshaft for a mandrel. It will be easier to pour the rod bearing away from the engine. Remember to include some shims.

Babbitt metal is an alloy of 4 parts copper, 88 parts tin, and 8 parts antimony. You can use the babbitt from the old bearing plus a little more new or used babbitt.

To pour a split bearing, both upper and lower halves at the same pouring:

1. Align the shaft, square and centered.



2.  Place cardboard liners between the two halves and against the shaft. Make holes in the cardboard near the shaft for the passage of the molten babbitt from the upper to the lower part. Pour thru the grease hole in the cap. The metal at the holes is easily broken when the cap is removed.

To form the ends of the bearing make cardboard washers and back them up with fire clay mixed with water. Be sure no water comes in contact with the melted babbitt. Even a few drops of water will cause the metal to spatter.



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