Northern Lights NL673 — Valve Clearance Adjustment

Adjustments

For the Northern Lights NL673, from the Northern Lights operator's manual.

Applies to: Northern Lights NL673

Procedure

1. Adjust every 1000 hours or as needed.
2. Do after cylinder head bolts re-tightened; engine cold and not running.
3. Turn engine by hand until inlet opens and exhaust closes.
4. Turn crankshaft one more full turn.
5. Loosen lock nut and adjust clearance between rocker arm and valve guide.
6. Clearance both intake and exhaust: 0.008 in. (0.2 mm).
7. Repeat for each cylinder individually.
8. Replace rocker arm cover; tighten cover nuts to 5 - 8 ft/lbs (0.8 - 2.3 kg/m).

Full service-parts list: Northern Lights NL673 →

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.

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