FNM HPE Series Owner's Manual page 91

3. Remove the impeller with the appropriate puller. Mark the impeller with a pen on the side at
sight to reposition it (only if it isn't damaged) in the same way.
4. If the impeller is too worn, provide for replacement.
5. When using a new impeller, lubricate it with silicon spray grease before mounting it.
Figure 36 - Lubrication of the impeller
6. Install the new impeller on the grooved shaft.
7. Re-close the pump cap and replace the seal gasket if possible.
8. Open the sea water intake valve.
9. Restart the engine and check for any leaks.
Use only original FNM spare parts.
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FNM HPE Series 87