Figure 4-22. Water Injection Pump
Replace nuts (1) and lockwashers (2) and torque to 217 in. lbs. in a criss-cross pattern, beginning at lower left.
Replace all original shims (10-13) when used. When new manifold is used reshim pump.
When starting the pump, check to see that there is no cylinder motion as this will cause
premature failure of the cylinder o-rings. Center cylinder motion can be eliminated by
switching with one of the end cylinders.
4-8.1.2 Servicing the Pumping Section.
Remove the discharge manifold as described in 4-8.1.1 a and b.
Grasp cylinders (14) by hand, and with an up and down motion, pull cylinders from inlet manifold (15).
Remove cotterpin (16), nut (17) and washer (18) from piston rod.
Next remove retainer (19), spacer (20) and piston/cup assembly (21). Remove inlet valve (22).
Examine inlet valve (22) surfaces for pitting, scale or grooves. Reverse valve and sand inlet side of valve using
240 grit paper for clean surface or replace if evidence of excessive wear. Slip onto piston rod.