BEARING 8T5590 - Caterpillar

In order to accommodate the new shaft water seal design, the water pump housing and impeller designs were slightly modified. As a result, the new 154-9291 Water Seal is not compatible for parts service in the former basic water pump groups. The new 154-3945 and 154-3946 Water Pump Housings are required for use with the new 154-9291 Water Seal and 155-8758 Impeller.
The new 160-0461 Impeller is the service replacement for the 7N-5910, 4W-9645, and 134-7422 Impellers in former basic water pump groups.
The 4W-3864 Water Seal and new 160-0461 Impeller must be used to service the former basic water pump groups. The new 149-0791 and 156-7088 Shafts and the new 154-4482 Oil Seal may be used to service the former basic water pump groups.