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the pictures covered my text. i pulled a 4bt from an aircraft power unit. when i pulled the pressure pump and timing gear from the 4bt to replace with a p7100 pump the shaft on the 7100 is way to big for the timing gear from the original pump. does anyone know what gear i would need to use?

hi guys, so i have a cummins question. i pulled a 4bt from an aircraft power unit. i pulled off the pressure pump and gear so i can replace that pump with p7100. however the 7100 shaft is way larger than the hole in the timing gear that was removed. any idea what timing gear i need?