Northern Lights 984K / M984 — Retightening cylinder head bolts

Maintenance

For the Northern Lights 984K / M984, from the Northern Lights operator's manual.

Applies to: Northern Lights M984, Northern Lights 984K engine

Procedure

1. Retighten the head bolts after the first 50 hours, with the engine cold.
2. Loosen the nuts and remove the rocker arm cover and rocker arm shaft.
3. Tighten head bolts with a torque wrench in the order shown in Figure 6, evenly in 2 or 3 passes.
4. End at 79.0 - 87.0 ft/lbs (11.0 - 12.0 kg-m) on the final pass.
5. Reinstall the rocker arm shaft and adjust the valves.
6. Replace the rocker arm cover.

Full service-parts list: Northern Lights M984 →

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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