Page 661 - Foton Workshop Manual - Auman EST-M

Engine section – Engine (Cummins ISF3.8) EG - 145

Lubrication system IN

Lubrication system DI
Overview

1. Lubrication system consists of oil collectors, oil pumps, oil filters, dipsticks and each pipeline. EG
2. Due to the different working conditions of the moving parts of the engine, the required lubrication
intensities are also different, so that the lubrication methods are also different. Lubrication methods TR
include pressure lubrication, splashing lubrication and gravity lubrication.

• Pressure lubrication is to compulsively send the lubrication oil to each friction surface by an oil pump.
AX
Generally, the pressure lubrication is used in the parts bearing relatively large force and quicker relative
movement speed, such as main crankshaft bearings, connecting rod bearings and wheel shaft bearings. In
addition, such as the valve rocker arm shaft, although the force is not large, because it is mounted on the FR
cylinder cover, the pressure lubrication must be used.

• Splashing lubrication is to lubricate with the oil mist formed by the lubrication oil sprayed when the ST
connecting rod journal and the main journal rotate and the lubrication oil sprayed from the special injection
holes. Generally, the splashing lubrication is used in the parts bearing relatively small force and slower
BR
relative movement speed, such as work surface of concave wheel and tappet. In addition, although the
cylinder wall has large work load, but the excessive lubrication is improper, otherwise the engine oil will glow
BW
to the combustion chamber, and the engine working will be deteriorated, so that, the splashing lubrication is
also used by it.
• Gravity lubrication is to utilize the gravity flow of lubricant itself to lubricate, for example, the lubrication of EL
the rocker arm to the valve and tappet is carried out by the gravity of lubrication oil in the rocking of the
rocker arm.
3. The scientific name of the engine oil is lubrication oil and it plays a non-negligible role in the normal
work of the engine.
a. Lubrication effect: lubricate the surface of movement parts, reduce frictional resistance and wear, and
reduce the power consumption of the engine.

b. Cleaning effect: the engine oil circulates continuously in the lubrication system to clean the friction surface
and take away debris and other foreign matters.
c. Cooling effect: the engine oil circulates continuously in the lubrication system to take away the heat
generated by friction of parts and plays a cooling role.
d. Sealing effect: the formation of oil film between the moving parts can improve their sealing and help
prevent air leaks or oil leaks.

e. Anti-corrosion effect: the formation of oil film on the surface of the parts can form a protective effect on the
surface of the parts and prevent corrosion and rust.

f. Buffering effect: the formation of oil film on the surface of moving parts can absorb the impact and reduce
vibration and play the buffering effect.

EG-145