Abstract: A fuel injector assembly for use in repairing a damaged fuel injector cylinder in an internal combustion engine includes a replacement injector sleeve and a replacement injector lower body. The replacement injector sleeve is installed in the damaged fuel injector cylinder and covers a crack in the fuel injector cylinder sidewall or the fuel injector cylinder bottom wall to inhibit leakage of fuel into a cooling system of the internal combustion engine.

Abstract: A method for detecting leaks in a diesel engine is disclosed. The method includes connecting a nozzle of a leak testing device to a threaded inlet of the engine. The threaded inlet is in fluid communication with a high pressure oil cavity of the engine. A hose in fluid communication with the nozzle is connected to a pressurized air source to pressurize the engine with pressurized air from the pressurized air source. With the engine pressurized, a technician listens for an audible sound identifying the pressurized air leaking from the engine. A location of the leaking is then identified based on the audible sound from the engine.