NOTE

Take special care when you clean aluminum alloy parts. Some cleaning solvents will attack and corrode aluminum. Mineral spirits is a good neutralizer after using cleaning solvents.

Pump Reassembly

After you complete] y clean and inspect the pump and the parts of it, reassemble the pump as prescribed by the manufacturer's manual. In all assembly operations, be careful to remove burrs and use a good pressure lubricant on the mating surfaces during all pressing operations. A good pressure lubricant aids in pressing and prevents scoring and galling. Use flat steel washers. They go next to the aluminum to prevent goring by the spring steel lock washers.

Pump Testing

The PT fuel pump is mounted on a test stand, as shown in figure 5-35. In the test, the pressure from the PT pump is measured and adjusted before the pump is placed on the engine. To test this pump, let pressure develop across the special orifices in the orifice block assembly. The pressure is measured on the gauges

Figure 5-35.-PT pump mounted on test stand.

Figure 5-34.-Cummins PT fuel pump.