Northern Lights — Changing lube oil filter (SP3)

Maintenance

From a Northern Lights owner's manual covering: 643/673, M643, M673, NL643, NL673. Check it applies to your exact model before use.

Applies to: Northern Lights M643, Northern Lights M673, Northern Lights NL643, Northern Lights NL673, Northern Lights L643 / L673 engine

Procedure

1. Use a filter wrench to remove the old filter and dispose of it in an approved manner.
2. Make sure the old gasket is removed and discarded; clean the mount face.
3. Spread a thin film of engine oil on the new filter rubber gasket.
4. Screw the filter on the nipple until the gasket meets the sealing surface.
5. Using hands only, tighten one-half turn farther.
6. Fill engine with oil, start and check for leakage; stop, wait 3 minutes and check level.

Full service-parts list: Northern Lights M643 →, Northern Lights M673 →, Northern Lights NL643 →, Northern Lights NL673 →

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.

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