Northern Lights — Replacing Raw Water Pump Impeller
Maintenance
From a Northern Lights operator's manual covering: M20CRW3, M844DW3, M844LW3, M844LW3G Gem series, 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 engine
Before you start
- Place protection under screwdrivers to avoid damaging the pump housing.
- Keep an extra impeller and cover gasket in reserve on board.
Procedure
- 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 new impeller; place sealing washers in outer end of 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 or as needed
Full service-parts list: Northern Lights M20CRW3 →, Northern Lights M844DW3 →, Northern Lights M844LW3 →, Northern Lights M844W3 →
Source: Northern Lights operator'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.