Renko, my steel trawler, is powered by a Detroit Diesel 4-71, a two-stroke diesel that's been around since the 1930s. When I bought Renko the engine had seized, so it came out, was rebuilt and went back in, and a year later it came out again for a second rebuild with Adrian, a Detroit Diesel mechanic. These topics cover how the engine works, both rebuilds, diagnosing problems, and its fuel and cooling systems.
PHOTO Dangar Marine Outboard Guide
How a Detroit Diesel two-stroke works
Open ›How a Detroit Diesel two-stroke compares with petrol two-strokes and four-strokes.
Rebuilding the Detroit Diesel 4-71
Open ›Every video from both rebuilds of Renko's engine, from taking it out to the first sea trial.
Diagnosing Detroit Diesel problems
Open ›Adrian diagnoses problems with Detroit Diesels, rebuilds a water pump and oil pump, and gets a seized 4-53 running.
Building, testing and replacing diesel injectors
Open ›Building and testing Detroit Diesel unit injectors, and fitting new ones to Renko.
Rebuilding a Detroit Diesel fuel pump
Open ›Adrian rebuilds the Detroit Diesel's blower, governor and fuel pump.
Cleaning and repairing a heat exchanger
Open ›Raw water cools an inboard engine's coolant through a heat exchanger, which gets blocked and corroded.
Thermal camera engine monitoring
Open ›Watching engine temperatures with a FLIR AX8 thermal camera on the Raymarine network.
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