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Questions and Answers
What is one of the primary purposes of lubrication in engines?
What is one of the primary purposes of lubrication in engines?
Which of the following systems are included in the lube oil system of GM locomotives?
Which of the following systems are included in the lube oil system of GM locomotives?
What is the function of the soak-back system?
What is the function of the soak-back system?
What is the discharge rate of the main lubricating oil pump?
What is the discharge rate of the main lubricating oil pump?
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Why is maintaining the correct quality of oil important for engine safety?
Why is maintaining the correct quality of oil important for engine safety?
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What happens when the pressure from the main lube oil pump exceeds that of the soak-back pump?
What happens when the pressure from the main lube oil pump exceeds that of the soak-back pump?
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Which part of the lube oil system has its own separate oil pump?
Which part of the lube oil system has its own separate oil pump?
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What pressure is the relief valve for the soak-back filter set at?
What pressure is the relief valve for the soak-back filter set at?
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What does the scavenging system do?
What does the scavenging system do?
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What is the discharge rate of the scavenging system?
What is the discharge rate of the scavenging system?
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What is the function of the by-pass valve in the oil filtering system?
What is the function of the by-pass valve in the oil filtering system?
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Where does the main lubricating oil system supply oil to?
Where does the main lubricating oil system supply oil to?
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What is the purpose of the relief valve in the main lubricating oil system?
What is the purpose of the relief valve in the main lubricating oil system?
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At what minimum oil pressure does the engine operate when idle?
At what minimum oil pressure does the engine operate when idle?
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What triggers the crank-case pressure shutdown switch?
What triggers the crank-case pressure shutdown switch?
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What does the hot oil detector do?
What does the hot oil detector do?
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Where does the piston cooling oil pump take its oil from?
Where does the piston cooling oil pump take its oil from?
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What is the primary purpose of the oil grooves in the piston pin bearing?
What is the primary purpose of the oil grooves in the piston pin bearing?
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What happens in the event of insufficient oil pressure in the engine?
What happens in the event of insufficient oil pressure in the engine?
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How is oil delivered to the two piston cooling oil manifolds?
How is oil delivered to the two piston cooling oil manifolds?
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Study Notes
Lube Oil System of GM Locomotive
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The system is a combination of four separate systems
- Scavenging system
- Soak back system
- Main lubricating system
- Piston cooling oil system
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Each system has its own oil pump
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The main lubricating oil pump and piston cooling oil pump are in the same housing
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The scavenging and soak back pumps are separate.
Need of Lubrication
- Essential for smooth operation of moving parts
- Cools bearings and pistons
- Protects metal surfaces from corrosion, rust, damage, and wear
- Keeps components clean and carbon-free, preventing damage from carbon deposition
- Ensures engine safety, component life depends on correct oil quality, quantity, and pressure, maintained by the lube oil system
Soak-Back System
- Ensures turbocharger bearings are lubricated before starting and after engine shutdown to remove residual heat
- Provides a separate lube oil pressure source.
- Soak-back system is controlled automatically by "start" and "stop" controls
Pump Discharges
- Main: 867 LPM (7-8 kg at 8th notch)
- Piston Cooling: 413 LPM (5-6 kg at 8th notch)
- Scavenging: 1703 LPM
- Soak Back: 11 LPM
Engine Protection Devices (EPD)
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Crank - Case Pressure Shutdown switch: When crancase pressure reaches a certain value, the CCPS switch triggers, drains governor oil, and shuts down the engine.
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Low Lube Oil switch: Attached to governor, shuts down the engine when lube oil pressure drops below a certain value.
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Hot Oil Detector: Operates when lubricant temperature reaches 126°C to prevent engine damage. Located on outlet elbow of the main lube oil pump
Trouble-Shooting
- Low oil pressure: Check lube oil level; add if low. Check lube oil viscosity. Check water and oil temperature; Clean strainer housing; Check for suction leaks; Change turbocharger oil filter element. Inspect piston pin, and connecting rod externally, check for overheating or loose components.
Main Lubricating Oil System
- Supplies lube oil to most of the engine's moving parts
- Oil from the pump flows to the main oil manifold located above the crankshaft
- A relief valve controls maximum oil pressure
- Oil is distributed to various engine parts (bearings, connecting rods, vibration damper, crankshaft thrust bearings, governor, gear train, turbocharger bearings) via branch pipe lines.
Piston Cooling Oil System
- Piston cooling oil pump takes oil from a common suction with the main lube oil pump
- Delivers oil to two piston cooling oil manifolds extending the length of the engine, one on each side
- A pipe at each cylinder directs oil through a carrier to cool the underside of the piston crown.
- Oil enters piston pin bearing grooves; remaining oil drains to the sump
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Description
Explore the intricacies of the Lube Oil System used in GM locomotives. This quiz covers the functions and components of four distinct lubrication systems, highlighting their importance for engine safety and performance. Test your understanding of how these systems work together for effective lubrication and cooling.
