Abstract: A protective device is provided for discontinuing the operation of an internal combustion engine having two banks of cylinders, each cylinder bank having an associated pressurized cooling circuit. Each cooling circuit has a separate pump which circulates liquid coolant by increasing the coolant fluid pressure at the pump outlet relative to the pump inlet.

Abstract: In a lubricant delivery system for use in an air compressor having a rotatable crankshaft and an internal chamber accessible by removal of an inspection plate having inner and outer surfaces, a positive displacement fluid pump mounted in the internal chamber and fluid lines for conveying lubricating fluid from the pump to a removable filter mounted on the outer surface of the inspection plate. Pressure relief means are associated with the filter for relieving pressure above a set point, and a distribution ring is adaped to circumscribe the crankshaft for introducing lubricating fluid to the crankshaft and from there to areas where lubrication is required.