How We Built a Marine Cooling System for Our Cummins Truck Engines

In this episode, we tackle the critical task of fabricating and installing the cooling system for our newly mounted Cummins 6.7 marine engines aboard our 78-foot aluminum trawler, Tangaroa. With the Detroits gone, it was time to make sure these truck engines could handle marine duty-and cooling is key. We sourced aftermarket heat exchangers off eBay and got to work. Blaine had to custom-fabricate engine brackets, thermostat elbows, and support poles for the coolant tanks to make everything fit and function properly. This wasn't a bolt-on job. From pipe bending to bracket welding, nearly every piece had to be designed from scratch. If you're curious how we transitioned from old-school dry stack Detroit Diesels to modern Cummins diesels with a fully custom marine cooling system, this episode has you covered. We're documenting every step of this boat repower to help other boaters and DIYers who might be planning their own engine swaps or upgrades. Whether you're into Cummins swaps, Detroit Diesel nostalgia, or just love watching real-world boat projects unfold-this is the stuff we live for. #CumminsMarine #BoatRefit #MarineCoolingSystem ? Want to go deeper into life onboard Tangaroa and get early access to every video from both of our channels? Join our crew at www.onboardtangaroa.com or right here through YouTube Memberships. We're not on Patreon anymore-we've built our own space where we can connect directly with you, share behind-the-scenes updates, and offer crew-only perks like: ?? Early and ad-free access to all videos ?? Real-time Wheelhouse Weekly Video updates ?? Our Monthly Captain's Log newsletter ?? Discounts on exclusive crew-only and other merchandise ??A Crew-Only Discord Community - we're in there LOTS! Whether you're here for the tech builds, the off-the-grid living, or just the adventure of it all-your support helps us keep sharing it every step of the way. And in return, you get the full story-not just the YouTube edit. ? Join us here: www.onboardtangaroa.com or click "Join" on our YouTube channel to become part of the crew. ? Also check out our other channel: Exploring the World Onboard Tangaroa ? Our free newsletter is launching soon-sign up on the site! ?Tried, Tested & Tangaroa Approved ?... We use TIMEZERO for all our navigation - it's the system we trust to keep us safe out there. They've also given our viewers 10% off any product on their site with the code TANGAROA. ? Questions/Business Inquiries? Reach us at: crew@onboardtangaroa.com Programs We Use: ? Music from: Epidemic Sound https://share.epidemicsound.com/3jxxv9 ? Social media scheduling made easy: SmarterQueue https://smarterqueue.com/?afmc=207 ?Do you know what BOAT stands for? Bring On Another Thousand. - Unknown (but very relatable)