47 MLB Engine Systems Flashcards
Engine Coolant System
The Detroit Diesel 6V92TA has a 10-12 gallon capacity closed-circuit cooling system. It is comprised of a 50/50 mixture of Power Cool and distilled water.
Engine Lubrication System
The Detroit Diesel 6V92TA has a closed-circuit, pressurized lubrication system with a capacity of 5.5 gallons, including filter and lines, of 40-weight lubricating oil. The normal operating range is 49-70 PSI.
At what PSI does the spring-loaded pressure relief valve mounted on the cylinder block discharge excess oil to the oil pan?
When the pressure exceeds 105 PSI.
Explain the oil flow
The oil flows from the oil cooler adapter plate to the full-flow oil filter (30 micron). Then it flows through the oil cooler and then back into the cylinder block. Here, a short vertical oil gallery and a short diagonal oil gallery carry the oil to the main longitudinal oil gallery through the middle of the block. Valves are also provided to bypass the oil filter and oil cooler if either becomes plugged.
Explain the oil pressure regulator valve
A pressure regulator valve located at the end of a vertical oil gallery stabilizes lubricating oil pressure at all speeds regardless of the oil temperature. The regulator valve opens when the oil pressure at the valve exceeds 62 PSI and discharges oil back to the oil pan.
