What can happen to a lubricating oil cooled piston if you stop lubrication oil pump as soon as you turn off the engine? (A) Nothing will happen. (B) You preserve the oil sealings in the piston. (C) The oil flashpoint will change. (D) Overheating of the piston and oil coke deposits in the cooling chambers. (E) Saya Tidak Tahu.
Answer (1)
When the lubrication oil pump is stopped immediately after turning off the engine, it can lead to significant issues in the engine's cooling and lubrication system, particularly in components like the piston that are cooled by lubricating oil.
The appropriate choice for this multiple-choice question is:
(D) Overheating of the piston and oil coke deposits in the cooling chambers.
Here’s why:
Lubrication Importance: Lubricating oil is crucial for cooling the piston and other engine parts by carrying away heat generated during operation. It also reduces friction and prevents wear and corrosion.
Engine Shut-down Process: Normally, after an engine is turned off, it is beneficial to continue circulating oil for a short duration. This helps to gradually remove residual heat from the engine components.
Consequences of Immediate Oil Pump Shutdown:
Overheating: If the lubrication oil flow is stopped immediately, the pistons may overheat since they are deprived of the oil that is necessary to carry away the residual heat.
Oil Coke Deposits: This overheating can cause oil to thermally degrade, forming coke or carbon deposits. These deposits can clog cooling passages, leading to further overheating and damage.
Therefore, allowing the oil pump to run briefly after engine shutdown helps prevent overheating and unwanted deposits, ensuring the longevity and efficiency of the engine components.
