Importance

Loading Importance Indicators...

Abstract

A diesel engine having a lubricating oil sump and a low pressure lubricating oil pump, is provided with a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump, a high pressure lubricating oil supply passage from said pump to said unit injector, a fuel supply to said unit injector, and an electronically controlled valve in said unit injector for controlling the application of the pressure of the lubricating oil to force said fuel to be expelled from said injector, wherein a priming reservoir is operatively connected to the low pressure lubricating oil pump and disposed upstream and above the high pressure supply pump and above the high pressure supply passage, preferably being disposed in the engine front cover and having a restricted return line to the oil sump for venting air from said reservoir, a siphon passage establishes fluid communication between said reservoir and said high pressure passage independently of the high pressure supply pump, and a check valve is disposed in the siphon passage to permit fluid flow from said reservoir to said high pressure passage, when the engine is not operating, while preventing flow from the high pressure passage to the priming reservoir, when the engine is operating.

Loading the Abstract Image...

First Claim