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Old 06-03-2012, 05:22 PM   #8
Larry H
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City: Pacific Northwest
Vessel Name: Jacari Maru
Vessel Model: 2014 Ranger Tug R-27
Join Date: Nov 2010
Posts: 359
The Lehman heat exchange should be serviced at least annually. The procedure is to shut off the raw water inlet, and remove the end caps. They are held on with a single bolt in the center. This will spill the raw water inside. Inspect the tube ends and clean gently as needed (metal tools can damage the tubes). Remove any old zinc parts, and replace the zinc. Reinstall the end caps using new rubber gaskets.

This procedure will ensure that the raw water side of the heat exchanger is not blocked and that there is a new zinc with the old zinc parts removed.

I have found that in the PNW there is a crusty growth on the tube ends and about 25% of the tubes were either blocked or partially blocked after a year.
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Larry H
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