Great Wall GW491QE, Service Manual

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LU-2
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฀Composition฀/function฀of฀lubrication฀system
Model฀491QE฀petrol฀engine฀adopts฀a฀compound฀lubrication the฀combination฀of฀pressure฀lubrication฀and
splash฀lubrication ; ฀And฀the฀lubrication฀system฀mainly฀consists฀of฀oil฀filter,฀oil฀pump,฀oil฀cooler,฀pressure-
limiting฀valve,฀etc.
Lubrication฀system฀has฀key฀functions฀as฀described฀below:฀lubrication,฀sealing,฀cooling,฀cleaning,฀shock
absorption,฀hydraulic฀pressure,฀buffer฀action,฀and฀anti-rust฀function.
Structure฀of฀lubrication฀system฀as฀shown฀in฀the฀figure฀below:
Inspection฀on฀machine-oil฀pressure
1. Inspection฀on฀the฀quality฀of฀oil฀of฀engine
Check฀whether฀machine-oil฀has฀deteriorated,฀has฀water฀content,changes
color,฀or฀becomes฀thin.
Machine-oil฀shall฀be฀changed฀if฀the฀quality฀is฀too฀bad.
It’s฀allowed฀to฀use฀machine-oil฀stated฀below:฀SG฀grade฀petrol฀machine-
oil,฀with฀viscosity฀coefficient฀API฀10W-40
(GB11121-1995 );฀or฀better฀than฀SG฀grade;฀or฀machine-oil฀with
recommended฀viscosity.
2.฀Inspection฀on฀the฀level฀of฀engine฀oil
The฀level฀of฀liquid฀shall฀be฀between฀the฀mark฀฀฀
“L”
and฀ the฀ mark
made฀on฀oil฀gauge฀If฀the฀level฀of฀liquid฀is฀too฀low,฀check฀whether
there’ sany฀leakage,฀and฀whether฀machine-oil฀has฀been฀filled฀to฀the฀mark
recommended฀viscosity( SAE)
temperature฀ranges฀before฀oil฀change
push฀rod
valve
tappet
camshaft
Lubrilation฀system-Composition฀/function฀of฀lubrication฀system ¡¢ Inspection฀on฀machine-oil
pressure
“F”
“F”
:
(
)
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