The Marine Diesel Division of the Allis-Chalmers Corp., Milwaukee, Wis., recently received an order valued at more than $6 million covering construction of 60 mud pumps for drilling rigs made by the Wilson Manufacturing Co., Wichita Falls, Texas.

The division, whose major activity is construction of large marine diesel engines, also operates a custom manufacturing department which produces a wide range of products to specifications of other firms.

The Wilson Manufacturing Co. is a major supplier of products used by oil well drillers. Allis-Chalmers will make equipment in Wilson's line of model 600 duplex mud pumps, 600 hp maximum at 95 strokes per minute.

Allis-Chalmers said that the order includes an option for 60 additional pumps. The order includes Allis-Chalmers responsibility for manufacture, assembly, test, and shipping of the pumps to Wilson dealers.