Great Wall GW491QE, Руководство по обслуживанию

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EM.1-19
(d)Pressed฀installation฀of฀piston฀pin
-฀Set฀the฀pressure฀of฀a฀hydraulic฀machine฀to฀6Mpa.฀When฀the฀piston฀is฀placed
to฀the฀clamping฀fixture฀(used฀for฀pressed฀installation)฀on฀a฀universal฀single-
column฀hydraulic฀machine,฀take฀out฀the฀connection-rod฀components฀sequentially
from฀oven,฀and฀the฀piston฀pin฀from฀the฀liquid฀nitrogen฀pot;฀The฀small฀head฀of
connection-rod฀will฀be฀inserted฀into฀the฀฀inner฀chamber฀of฀piston,฀with฀the
small-head฀hole฀facing฀exactly฀the฀installation฀hole฀of฀piston฀pin;฀Hold฀the฀bid
head฀of฀the฀connection-rod฀by฀left฀hand฀to฀keep฀the฀rod฀level,฀and฀insert฀the
piston฀pin฀into฀the฀installation฀hole฀of฀piston฀pin฀by฀right฀hand,฀then฀the
piston฀pin฀may฀be฀pressed฀and฀installed฀into฀place฀using฀hydraulic฀machine
to฀be฀effected฀by฀a฀clamping฀fixture฀used฀for฀pressed฀installation .
2.฀Installation฀of฀piston฀ring
(a)Manually฀install฀the฀oil-ring฀gasket฀spring฀into฀the฀ring-groove฀of฀combined
oil฀rings฀at฀the฀apron฀of฀piston;฀And฀do฀not฀overlay฀at฀the฀opening฀point.
(b)Special฀piston-ring฀installation฀pliers฀may฀be฀used฀to฀install฀the฀scrapin g
blades฀of฀oil฀ring two฀blades ,฀the฀second฀gas฀ring,฀and฀the฀first฀gas฀ring
into฀place฀sequentially.
Remark Two฀gas฀rings฀vary฀from฀each฀other:฀The฀first฀gas฀ring฀has฀a฀mark
AT G on฀end฀surface,฀the฀second฀one฀has฀a฀mark A2 on฀end฀surface.
And฀the฀side฀of฀gas฀ring฀having฀marks฀shall฀face฀upward.
(c)The฀adjustment฀of฀the฀opening฀position฀of฀piston฀ring฀is฀as฀shown฀in฀the
figure:
Note:
1.On฀the฀top฀of฀European- ฀piston,฀two฀gr ooves฀have฀been฀installed฀to
pr event฀air-valve฀fr om฀striking,฀and฀an฀anodic฀oxidation฀may฀be฀performed
on฀the฀top฀of฀piston฀as฀well.
2.E ur opean-
฀piston฀and฀piston฀r ing฀may฀be฀installed฀onto฀E ur opean-
device,฀but฀these฀two฀par ts฀ must฀ be฀ inter changed฀ simultaneously;
E ur opean- piston฀and฀piston฀r ing฀may฀not฀be฀installed฀onto฀E ur opean-
฀device,฀or ฀air ฀valve฀will฀str ike฀against฀the฀piston; ฀E ur opean- ฀piston
r ing฀may฀not฀be฀installed฀onto฀E ur opean- piston,฀or ฀it฀will฀lead฀to฀a
ser ies฀of฀tr ouble,฀eg.฀bur ning฀of฀oil,฀abnor mal฀sound฀pr oduced฀on฀engine,
etc.
3.Assembly฀of฀the฀connection-rod฀bush
(a) After฀ the฀ installation฀ of฀ piston฀ ring,฀ the฀ piston฀ &connection-rod
component฀may฀be฀transferred฀by฀group฀to฀a฀position฀where฀the฀connection-
rod฀bush฀will฀be฀installed.
(b)The฀connection-rod฀bushes฀may฀be฀selected฀in฀accordance฀with฀the฀group
No.(group฀ No.฀ for฀ big-head฀ hole฀ to฀ be:6,฀ 7,฀ 8)marked฀ on฀ the฀ big-
head฀hole฀side฀of฀the฀connection-rod.
(c) After฀nuts฀on฀connection-rod฀have฀been฀removed,฀a฀special฀bench฀vice
may฀ be฀ used฀ to฀ dismantle฀ bush฀ cover฀ from฀ the฀ connection-rod.
(d)฀Clean฀up฀the฀inner฀surface฀of฀the฀hole฀of฀connecting฀rod฀big฀end,then
mount฀the฀connecting฀rod฀bearing฀to฀the฀connecting฀rod฀and฀cover฀of฀the
connecting฀rod฀bearing฀respectively,the฀convex฀key฀of฀the฀connecting฀rod
bearing฀should฀be฀inserted฀into฀the฀locating฀notch฀of฀connecting฀rod.
piston฀pin
first
second
symbol฀mark
upper฀ring
lower฀ring
second฀compression฀ring
first฀ compression
ring฀and฀piston฀ring
front
oil฀control
Preparations฀before฀and฀key฀points฀to฀the฀disassembly฀of฀engine฀body
-Check฀whether฀the฀piston฀pin฀has฀been฀pressed฀and฀installed฀to฀place;฀Hold฀the฀piston฀by฀left฀hand,฀and฀pull฀the฀connection-rod฀by
right฀hand,฀and฀rotate฀the฀connection-rod,฀and฀the฀rotation฀of฀piston฀pin฀shall฀be฀made฀in฀a฀flexible฀฀way.
SST฀09221-00020฀฀09221-00030฀฀09221-00040
09221-00071฀฀09221-00081
Remark
The฀mark฀“forward”฀of฀piston฀shall฀be฀consistent฀to฀that฀of฀the฀connection- rod฀component.
Groups฀of฀the฀connection-rod฀divided฀by฀weight฀shall฀consistent฀to฀each฀other.
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