Yanmar 4JH3-DTE Heat Exchanger Autopsy: Why maintenance on time can save you ALOT!

Today I pull apart (or attempt to!) remove the heat exchanger tube bundles for service and while doing so discovered some severe damage requiring housing replacement alongside tube bundle servicing/replacement. While the tube bundles can be pricey, the housings are even more pricey, so you really don't want to wait so long that they are destroyed too! Learn from this owners mistake and maintain your heat exchangers!