08/09/2026
From a bare long block to a fully dyno-tested powerplant. At Cogswell Marine and Motorsports, we rebuild Volvo Penta diesel long blocks completely in-house, from precision machining and assembly to final dyno testing. Every engine is carefully assembled, thoroughly inspected, and run on our dyno, before it ever leaves the shop. That means you're getting a proven, reliable engine that's ready to bolt in and get back to work. When a new engine isn't available or isn't the most cost-effective option, our remanufactured long blocks can extend the life of your vessel, and save you thousands. Watch this D4 transformation from bare long block to dyno-proven power. Follow Cogswell Motorsports for more engine rebuilds, IPS repairs, dyno testing, and behind the scenes machine shop content.
Cogswellmarinemotorsports.com
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