3907458 3912019 Sherwood M71 Raw Water Sea Pump Cummins Diesel Engine 4BT 4B. Water Pump x 1. The package contains all the parts shown in the picture. Sherwood Pumps M71 M70. Cummins Pumps 3907458 3912019. Port Size Outside Diameter 1- 1/4 or 32mm. Major Service Kit KC1025. Minor Service Kit MC1025. Made of high-quality materials, wear-resistant, corrosion-resistant, aging-resistant, and with a long product lifespan. Fit Cummins B series engines, Cummins 4B (up to 150HP) and 6B (up to 210HP) engines. Marine Engine Models Specifications. 4B3.9M, 4B3.9D(M), 4BT3.9M, 4BT3.9-D9(M), 4BTA3.9M, 4B5.9M, 6B5.9M, 6B5.9-D(M), 6BT5.9M, 6BT5.9-D(M). Use the OE number as an accurate reference. If you don’t know the OE number of the parts you need, please provide us with the brand, horsepower, model, or year of your boat Motor.