Northern Lights — Raw Water Pump Impeller Replacement
Maintenance
From a Northern Lights owner's manual covering: M20C, M844, M844L, OM844K2, SP5, SP6. Check it applies to your exact model before use.
Applies to: Northern Lights M20C, Northern Lights M844, Northern Lights M844L
Before you start
- Place protection under the screwdrivers in order not to damage the pump housing.
- Make sure that there is always an extra impeller and cover gasket in reserve on board.
Procedure
- Change the seawater pump impeller every 1000 hours, or as needed.
- Remove the pump end cover. Pry out the impeller using needle-nose pliers or two screwdrivers.
- Be sure you remove all pieces of failed impeller.
- Clean the inside of the housing.
- Press in the new impeller and place the sealing washers in the outer end of the impeller center.
- Replace the cover using a new gasket.
Tools required
- Needle-nose pliers or two screwdrivers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Change impeller every 1000 hours
Full service-parts list: Northern Lights M20C →, Northern Lights M844 →, Northern Lights M844L →
Source: Northern Lights owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.