Northern Lights L6125 — Heat Exchanger Cleaning

Maintenance

For the Northern Lights L6125, from the Northern Lights operator's manual.

Applies to: Northern Lights L6125, Northern Lights L6125H engine

Procedure

1. Drain cooling system.
2. Remove cooling water pipes between heat exchanger and water pump inlet.
3. Disconnect hose to seawater pump.
4. Unscrew attaching bolts holding heat exchanger to expansion tank.
5. Remove bolts holding heat exchanger cover.
6. Wash core inside and out; chemical agents may be used if necessary.
7. Clean accessible parts of heat exchanger housing.
8. Reassemble using new gaskets and sealing rings.

Full service-parts list: Northern Lights L6125 →

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.

More Northern Lights repair guides →