Page 163 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Importance of testing of oil pumps

Objectives: At the end of this lesson you shall be able to
• demonstrate importance of testing of oil pumps.

• As the two moving parts must be supplied with oil in proper quantity
• So that the oil can be supplied in the right quantity to the required place
• To check if the oil pump is not working properly or if the relief valve opens at low pressure.
• If the oil pressure in the engine is less than normal

• If the inlet passage to the oil pump is choked up
• To check oil pipeline leakage
• To check whether the rotation of the pump gear creates a torque in the pump body due to centrifugal force and
pulls the oil from the oil sump by the pump into the oil pump body.

• To check if the oil in the pump body is pressed against the gear side due to the rotation of the gear and the oil
is forced out of the outlet port adjacent to the pump housing by pressure.
• To check if the pressure of the oil coming out of all pumps is 0.6 to 1.4 PSI at normal idling speed.

• To check if the oil pressure is between 2.5 to 4.0 kg sq cm in high speed

Importance of servicing oil filter

Objectives: At the end of this lesson you shall be able to
• demonstrate importance of servicing oil filter.

In this system all the oil passes through the filter before reaching the main oil gallery. One bypass valve is provided
in the filter which allows oil to reach the main oil gallery directly if the filter is choked.

Bypass oil filter system: In this system only a part of the engine oil enters the filter. After filtering, the oil goes to
the oil sump. The remaining oil goes directly to the main oil gallery.
Filter element: Filter elements are made of felt, cotton waste, cloth and paper. Oil filters are replaced after
certain kilometers of running of the engine as specified by the manufacturer.
Importance of Servicing the oil filter is
1 Cleanliness: The oil filter removes contaminants such as dirt, metal particles, and sludge from the engine
oil, ensuring that only clean oil circulates through the engine. This helps prevent wear and damage to engine
components.

2 Efficiency: A clean oil filter allows the engine oil to flow freely, ensuring proper lubrication of engine parts. This
helps maintain optimal engine performance and fuel efficiency.
3 Longevity: Regularly servicing the oil filter prolongs the life of the engine by reducing wear on critical
components. Clean oil also helps prevent corrosion and extends the lifespan of the engine.
4 Preventing Engine Damage: Contaminants in the oil can cause damage to engine components over time
if not filtered out. Servicing the oil filter helps prevent this damage, leading to a smoother and more reliable
engine operation.
Overall, regular servicing of the oil filter is essential for maintaining the health and performance of the engine, as
well as ensuring its longevity and reliability.

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CITS : Automotive - Mechanic Diesel - Lesson 39 - 46