Northern Lights — SP-15 Raw Water Pump
Maintenance
From a Northern Lights owner's manual covering: 844DW3, 844LW3, M20CRW3, M844DW3, M844LW3, M844W3. Check it applies to your exact model before use.
Applies to: Northern Lights M20CRW3, Northern Lights M844DW3, Northern Lights M844LW3, Northern Lights M844W3, Northern Lights 844 (844L for LW models) engine, Northern Lights 844L engine
Before you start
- Place protection under the screwdrivers so as not to damage the pump housing.
- Make sure there is always an extra impeller and cover gasket in reserve on board.
Procedure
- Change the seawater pump impeller every 500 hours, or as needed.
- Remove the pump end cover; pry out the impeller using needle-nose pliers or two screwdrivers; 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
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Change impeller every 500 hours
Full service-parts list: Northern Lights M20CRW3 →, Northern Lights M844DW3 →, Northern Lights M844LW3 →, Northern Lights M844W3 →
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.