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Old 10-18-2016, 10:57 AM   #2
DavidM's Avatar
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 5,032
Seems like I remember that Seaboard Marine in Oxnard, Ca charges $600 to do a Cummins after cooler.

Go to and look under Tony's tips for articles on after cooler servicing. He strongly recommends re-assembling with heavy water proof grease to retard future corrosion. Look at the Cummins article first as it has more written info and then the Yanmar 6LY picture essay. The 4LH after cooler is similar.

You can probably DIY as good or better than the shop if you follow his instructions. The main problem will be getting the old core out. Sometimes it takes days of soaking with WD40 and a little pounding with a mallet and wooden plug to get it out.

But if you have the shop do it, make sure they use LOTS of grease. It will come apart a lot easier the next time.

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