A Detroit Diesel has unit injectors, which pump the fuel to injection pressure as well as spraying it into the cylinder. In the first video Adrian shows me all the parts of a unit injector and how they work, then pressure tests them (after setting up the cam rollers and oil pump).

We replace Renko's N60 injectors with N50s, then tune up her engine and the 4-53 in Mammoot: setting the valve clearances and injector heights and running the rack.