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Old 05-17-2021, 10:44 PM   #8
firehoser75
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City: Nanaimo
Vessel Name: former owner of "Pilitak"
Vessel Model: Nordic Tug 37
Join Date: Feb 2018
Posts: 1,703
John,
If you have not had the raw water components serviced off engine in the 10 years you have owned the boat, then my guess is it is time. Running acid through the components on engine, is a "stop gap" method of reducing temperatures mid season to "get through the boating season". It will not remove impeller bits, or all of the zinc pieces that can accumulate over time. O rings or seals should be replaced, and each component (such as heat exchanger, gear oil cooler, etc.) should be pressure tested and repaired or replaced as needed. We do not want salt water where it is not supposed to be.
I agree with Dave about ensure that your gauge is reading correctly as a first step. However, if real servicing has been left for 10 years, then it is time.
Many marine diesel mechanics suggest this as being essential.
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Tom
Nanaimo, BC
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