Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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Section VI Lubrication System
While the engine is working, all motion parts apply one specific force onto another part and generate relatively high
speed motion. With the relative motion, the friction is necessarily generated on the part surfaces, which will accelerate
the wear. Therefore, to relieve the wear, reduce the friction resistance, and prolong the service life, the engine must be
fitted with lubrication system.
z The engine oil filter is functioned to filter out the metallic wear dust, mechanical impurity, and engine oil oxide
from the engine oil. The ingress of these impurities into the lubrication system along with the engine oil will
speed up the wear of engine parts and may block the oil pipe or oil passage.
z The engine oil pump is of externally engaged gear pump and is driven by the crankshaft.
z The cooling nozzle of piston is arranged on the main oil passage to realize the stable oil spray for cooling. The
spray of engine oil into the cold oil passage within the piston can effectively reduce the thermal load of the
piston.
Va l ve
mechanism
Splash
Rocker arm bearing
Oil way of
cylinder block
Various cam
tappets
Splash
Various camshaft bearings
Various crankshaft
main bearings
Splash
Piston group
Timing gear
Turbocharger
Oil way of
cylinder bloc
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