Northern Lights M150A13 / M80A13 — Remove, Inspect and Clean Heat Exchanger Core

Maintenance

For the Northern Lights M150A13 / M80A13, from the Northern Lights owner's manual.

Applies to: Northern Lights M150A13

Procedure

1. Close sea cocks and drain sea water system.
2. Drain about two gallons engine coolant; close drain cock.
3. Remove hoses and end caps with heat exchanger core.
4. Clean buildup from end caps and inspect zinc plugs.
5. Clean each tube with 4.76 mm brass rod.
6. Flush tubes with clean water.
7. Install end caps and tighten screws to 24 N·m.
8. Fill cooling system, open sea cock, run and check leaks.

Full service-parts list: Northern Lights M150A13 →

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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