Water Inlet System Flushing

Overheat Diagnosis

Water Inlet System Flushing

If the engine has overheated or if the raw water pump has been disassembled and the impeller has been found to be missing pieces, the pump inlet system should be flushed. To do this, remove the inlet hose from the raw water pump and from the power steering cooler as in figure 5. Then attach a garden hose as shown in figure 6, open the water valve for the hose slightly and allow water to flow. Any pieces of impeller that have fallen into the inlet hose will be flushed out into the bilge. Once this hose has been cleared of any debris the hose can then be reconnected at the power steering cooler and now the drive can be flushed.

Figure 5 Inlet Hose Disconnected From P/S Cooler

Overheat Diagnosis

Figure 6 Pump Inlet Hose Hookup for Flushing When flushing the drive it may be necessary to remove the cleanout cover on DP-SM or SXM drives to check for any foreign debris or to ensure that the flushing was successful (see figure 7). Ensure that the cover is properly resealed during cover reinstallation.

Figure 7 SX-M/DP-SM Drive Cleanout Cover