ZONGSHEN CBS300 User manual

共50 页第1页
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CBS300 发动机
维修手册
CBS300 Engine
Maintenance Manual
编制：
Prepared by:
校对：
Checked by:
审核：
Reviewed by:
批准：
Approved by:

共50 页第2页
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主要性能技术参数
Main Technical Parameters
项目
Item
规格
Specification
发动机
Engine
型号
Model number ZS174MN-3
型式、汽缸数
Type and number of
cylinders
单缸、水冷、四冲程、顶置单凸轮式
Single-cylinder, water-cooling,
four-stroke, single overhead camshaft
缸径×行程
Bore × stroke φ74×65mm
汽缸工作容积
Displacement 279.5ml
压缩比
Compression ratio 10.2~10.7：1
化油器形式
Carburetor type
真空膜片式
Vacuum membrane
空气滤清器
Air filter
纸滤芯
Paper filter element
润滑方式
Lubrication method
压力+飞溅
Pressure + splash
起动方式
Starting method
电起动
Electric
最大功率/相应转速
Max. power/corresponding
speed
18.5(1±5%)kW/8500(1±5%)rpm
最大扭矩/相应转速
Max. torque/corresponding
speed
22(1±5%)N.m/7000(1±5%)rpm
怠速
Idle speed 1400±100 r /min
传动系统
Transmission System
离合器
Clutch
手动湿式多片式
Manual wet multi-plate
变速器
Transmission
常啮合两级传动六档变速
Constant mesh, two-stage
transmission, 6-speed gearshift
变速方式
Gearshift method
左脚操纵往复式
Reciprocating operation by left foot
初级减速比
Primary reduction ratio 3.091
齿轮速比
Gear ratio
第1档
1st gear 2.58
第2档
2nd gear 1.86
第3档
3rd gear 1.44
第4档
4th gear 1.16
第5档
5th gear 1
第6档
6th gear 0.857

共50 页第3页
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项目
Item
规格
Specification
点火系统
Ignition System
点火方式
Ignition method
电容储能式
Capacitor discharge
火花塞
Spark plug CR8EB
火花塞间隙
Spark plug gap 0.7mm-0.8mm
油料
Fuel
燃油牌号
Fuel grade ≥RQ90
发动机机油
Engine oil
规格
Specification SJ 10W/40
容量
Capacity 1.3L

共50 页第4页
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汽缸头和气门
Cylinder Head and Valve
维修须知
Maintenance instructions
故障排除
Troubleshooting
汽缸头盖的拆卸
Removal of cylinder head cover
汽缸头的拆卸
Removal of cylinder head
汽缸头盖的分解
Disassembling of cylinder head cover
气缸头的分解
Disassembling of cylinder head
气门和气门弹簧的检查
Inspection of valve and valve spring
摇臂及摇臂轴的检查
Inspection of rocker arm and rocker arm shaft
凸轮轴部件的检查
Inspection of camshaft components
汽缸头的检查
Inspection of cylinder head
气门座的检查、研磨
Inspection and grinding of valve seat
气门导管的检查
Inspection of valve guide
气门导管的更换
Replacement of valve guide
测量气门座接触面的宽度
Width measurement of valve seat contact
surface
汽缸头的组装
Assembling of cylinder head
气缸头盖的组装
Assembling of cylinder head cover
汽缸头的安装
Installation of cylinder head
气缸头盖的安装
Installation of cylinder head cover
维修须知
Maintenance Instructions
注意事项：
Notes:
● 凸轮轴是由缸头上油道孔供油润滑的，缸头上的油道绝对不能有异物进入，并保持畅通。
The camshaft is lubricated with oil supplied through the cylinder head oil passage hole,
which shall never have foreign matters and shall be kept unblocked.
● 在安装汽缸头之前，缸头定位销一定要装配好。
Before installation of cylinder head, the cylinder head dowel pins shall be well assembled.
● 凸轮轴不能有划伤痕迹，装配时先打上机油。
The camshaft shall have no scratch marks and be applied with oil before being assembled.
各部件维修参数
Maintenance parameters of components
项目
Item
标准值 mm
Standard Value
(mm)
维修极限值 mm
Maintenance
Limit Value (mm)
摇臂与缸头盖摇臂开档的轴向间隙
Axial clearance between rocker arm and cylinder
head cover
0.05～0.3 0.5

共50 页第5页
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项目
Item
标准值 mm
Standard Value
(mm)
维修极限值 mm
Maintenance
Limit Value (mm)
摇臂与摇臂轴的径向间隙
Radial clearance between rocker arm and rocker arm
shaft
0.016～0.045 0.08
气门间隙
Valve clearance 0.02～0.04 ------
凸轮轴基圆跳动
Camshaft base circle run-out 0.02 0.04

共50 页第6页
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项目
Item
标准值 mm
Standard Value
(mm)
维修极限值 mm
Maintenance
Limit Value (mm)
气门
Valve
气门杆外径
Outer diameter of
valve stem
进气
Intake φ4.972～φ4.987 φ4.96
排气
Exhaust φ4.96～φ4.975 φ4.94
气门导管内径
Inner diameter of
valve guide
进气
Intake φ5～φ5.015 φ5.025
排气
Exhaust φ5～φ5.015 φ5.025
气门密封带宽度
Width of valve sealing strip 1.5 ----
汽缸头
Cylinder head
平面度
Planeness 0.04 0.05
气门座工作面宽度
Width of valve seat working surface 0.8 ----
故障排除
Troubleshooting
缸内气压低：
Low pressure in cylinder:
1、气门
Valve
---------- 气门间隙调整不正确
Incorrect adjustment of valve
clearance
---------- 气门密封不严
Insufficient sealing of valve
---------- 配气正时不对
Incorrect valve timing
---------- 气门弹簧断裂
Breakage of valve spring
2、汽缸头
Cylinder head
---------- 火花塞与汽缸头连接不紧密
Loose connection between spark
plug and cylinder head
---------- 汽缸头垫损坏
Damage of cylinder head gasket
---------- 汽缸头有裂纹或砂眼
Cracks and sand holes on cylinder
head
3、缸体、活塞、活塞环
Cylinder body, piston, piston ring
---------- 活塞环间隙过大或断裂
Excessive clearance or breakage of
piston ring
---------- 活塞有裂纹或过度磨损
Cracks or excessive wear of piston
---------- 缸体内径过大或砂眼
Excessive inner diameter of cylinder
body or sand holes on it
排气有黑烟
Exhaust having black smoke
1、气门导管磨损
Wear of valve guide
2、挡油罩渗漏或损坏
Leakage or damage of oil shield
3、汽缸头垫渗漏
Leakage of cylinder head gasket
4、活塞环间隙过大
Excessive clearance of piston ring
噪音过大或异响
Excessive or abnormal noise
1、气门调整不正确
Incorrect adjustment of valve
2、气门卡住或气门弹簧断裂
Valve getting stuck or valve spring getting
broken
3、上摇臂过度磨损
Excessive wear of upper rocker arm
4、配气正时不准
Inaccurate valve timing
5、凸轮轴磨损
Wear of camshaft

共50 页第7页
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汽缸头盖的拆卸
Removal of Cylinder Head Cover
1、拆下汽缸头盖进气、排气两侧气门室盖的 4
颗GB/T16674 小盘 M6×20 的紧固螺栓。
Remove the 4 small GB/T16674 M6×20
pan-head fastening bolts on intake and
exhaust valve chamber covers of cylinder
head cover.
2、拆下气缸头进气、排气两侧的气门室盖。
Remove intake and exhaust valve
chamber covers of cylinder head.
3、拆下紧固缸头盖的 2颗GB/T16674 小盘螺
栓M6×105、2颗GB/T16674 小盘螺栓
M6×20、1颗GB/T16674 小盘螺栓 M6×32，
1颗GB/T16674 小盘螺栓 M6×28，2颗
GB5789 大盘螺栓 M6×65。
Remove the 2 small GB/T16674 M6×105
pan-head bolts, 2 small GB/T16674
M6×20 pan-head bolts, 1 small
GB/T16674 M6×32 pan-head bolt, 1 small
GB/T16674 M6×28 pan-head bolt and 2
large GB5789 M6×65 pan-head bolts on
cylinder head cover.
注意：
Note:
2颗大盘螺栓各有一铜垫片(φ6.2×2×φ13)。
Each of the 2 large pan-head bolts has a
copper gasket (φ6.2×2×φ13).
4、拆下缸头盖。
Remove the cylinder head cover.
汽缸头的拆卸
Removal of Cylinder Head
1、拆下 NC250 缸头密封胶套，NC250 凸轮轴
档板（形状为半圆环）。
Remove the NC250 cylinder head sealing
bush and the NC250 camshaft baffle
(semicircular).
M6×20
大盘 M6×65
有铜垫
Large M6×65 pan-head bolts
have copper washers.
M6×20
M6×105
M6×28 M6×32
NC250 缸头密封胶套
NC250 cylinder head sealing
bush
NC250 凸轮轴档板（形状为半圆环）
NC250 camshaft baffle
(semicircular)

共50 页第8页
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2、拆下 2颗紧固启动电机的 GB5789 大盘螺栓
M6×28，拆下启动电机。
Remove the 2 large GB5789 pan-head
bolts fastening the starting motor, and
remove the starting motor.
注意：
Note:
电机底部靠近废管侧有一颗电机安装座圈，不
要遗漏。
There is a motor mounting seat ring near
the waste pipe side on the motor bottom,
which shall not be omitted.
3、拆下 CB125Z 张紧器密封螺栓 M6×6，拆下
2颗紧固张紧器的 GB70.1 内六角螺栓
M6×16，然后在拆下张紧器，张紧器密封垫。
Remove the CB125Z tensioner sealing bolt
(M6×6), the 2 pieces of GB70.1 M6×16
hexagon socket head bolts fastening the
tensioner, and then the tensioner and
tensioner sealing gasket.
注意：
Note:
避免张紧器上的 O形圈掉落
Prevent the O-ring on tensioner from
falling off.
4、拆下凸轮轴轴承 6201、轴承档板。
Remove camshaft bearing 6201 and
bearing baffle.
5、拆下凸轮轴组合。
Remove the camshaft assembly.
6、拆下 4颗AB 栓螺母 M10×1.25，然后拆下 4
颗平垫圈（10.5×2×20）。
Remove four AB bolt nuts (M10×1.25) and
then remove the 4 flat washers
(10.5×2×20).
7、拆下气缸头。
Remove the cylinder head.
底部有一颗座圈
A
seat ring on the
bottom 大盘 M6×28
Large M6×28 pan-head
bolts
内六角螺栓
M6×16
M6×16 hexagon socket head
bolts
张紧器密封螺栓
M6×6
M6×6 tensioner sealing bolt
凸轮轴轴承
Camshaft bearing
轴承档板
Bearing baffle
A
B栓螺母、垫片
Nuts and washers for AB bolts

Di
s
1、
拆
栓
R
s
h
c
y
注意
：
Note
螺栓
上
Ther
e
2、
拆
2
R
p
a
(
φ
3、
取
R
a
r
r
o
用气
门
然后
放
簧和
气
Use t
h
spring
valve
c
remo
v
and t
h
注
意
Not
e
1.
2.
汽
s
assemblin
g
拆
下缸头盖
上
栓
M14×1。
R
emove the
2
h
aft locatin
g
y
linder hea
d
：
:
上
带有 O形
e
are O-rin
g
拆
下顶部 2
颗
颗铜垫片(φ
R
emove th
e
a
n-head bo
φ
6.2×1×φ1
0
取
下进、排
气
R
emove the
r
m shafts a
o
cker arms.
气
Disassem
b
门
拆卸器将
气
放
松气门拆
卸
气
门。
h
e valve ext
r
and remo
v
c
ollet; then
l
v
e the valve
h
e valve.
意
：
e
:
为了防止气
份的压缩气
即可；
To avoid
p
valve spri
n
excessivel
y
valve colle
t
拆下的全部
零
配时达到原
来
All the pa
r
marked so
original lo
c
汽
缸头盖的
分
g
of Cylind
上
2颗NC2
5
2
pieces of
N
g
plate bolt
s
d
cover.
圈φ9.4×2.
4
g
s (φ9.4×2.
4
颗
GB16674
小
6.2×1×φ10
)
e
2 small
lts and the
0
).
气
摇臂轴，
进
intake an
d
s well as i
n
气
缸头的分
解
b
ling of Cyl
气
门弹簧压
下
卸
器，取下
气
r
actor to pr
e
v
e the valv
e
l
oosen the
v
spring reta
i
门弹簧产生
永
门弹簧，只
需
p
ermanent
n
g, it shall
y
but as m
o
t
can be re
m
零
件均应作
好
来
的装配位
置
r
ts remov
e
as to mou
c
ations dur
共
分
解
e
r Head C
o
5
0摇臂轴定
位
N
C250 roc
k
s
(M14×1)
o
4
。
4
) on the bol
小
盘螺栓 M
6
)
。
GB16674
M
2 copper g
进
、排气摇臂
d
exhaust
n
take and e
x
解
inder Head
，拆下气门
锁
门弹簧座，
气
e
ss down th
e
e
and remo
v
alve extrac
t
i
ners, valve
永
久变形，
不
需
能拆下气
门
deformati
o
not be pr
e
o
derately a
m
oved.
好
标记，确
保
置
。
e
d shall be
nt them to
ing assem
b
共
50 页第
Page 9 of 5
o
ve
r
位
板螺
k
er arm
on the
ts.
6
×18，
M
6×18
askets
。
rocker
x
haust
d
锁夹；
气
门弹
e
valve
o
ve the
t
or and
spring
不
能过
门
锁夹
o
n of
e
ssed
a
s the
保
在装
well
their
b
ling.
9页
0
s
小
盘
Sm
a
铜
垫
φ6.
2
摇
臂轴定位板螺栓
M
M
14×1 bolts for ro
c
s
haft locating plate
盘
螺栓 M6×18
a
ll M6×18 pan-hea
d
垫
片φ6.2×1×φ10
2
×1×φ10 copper w
a
M14×1
c
ker arm
e
d
bolts
a
shers

In
检查
气
损，
测
Chec
k
the v
a
outer
d
value
s
进气：
Intak
e
排气：
Exha
u
接触
面
Maint
e
surfa
c
注
意
Not
e
如
果
门
座
更
换
If t
h
rou
g
con
gua
val
v
Insp
e
检查
摇
隙，
如
隙偏
大
Chec
k
and t
h
any
w
cleara
shall
b
检查
摇
则需
更
Chec
k
seriou
repla
c
气门
和
spection o
f
气
门是否弯
曲
测
量气门杆
外
k
the valve
f
a
lve stem fo
r
d
iameter of
s
:
φ4.96mm
e
: φ4.96mm
φ4.94mm
u
st: φ4.94m
m
面
的宽度维
修
e
nance limi
c
e: 1.5mm
意
：
e
:
果
气门接触
面
座
接触不正
常
换
气门。
h
e contact
g
h, uneve
n
tact with
v
a
rantee the
v
e shall be
r
摇
臂
e
ction of R
o
摇
臂是否有
磨
如
磨损、毁
坏
大
则均需更
换
k
the rocke
r
h
e rocker ar
m
w
ear and d
a
a
nce of roc
k
b
e replaced
摇
臂轴是否
有
更
换新的摇
臂
k
the rocker
s wear, th
e
c
ed with a n
e
和
气门弹簧
的
f
Valve and
曲
、烧伤或气
外
径。维修
极
f
or bending
r
abnormal
w
valve stem.
m
修
极限值：1.
5
t value for
面
很粗糙，
磨
常
，不能保
证
surface
o
n
ly abraded
v
alve seat
,
sealing p
e
r
eplaced.
臂
及摇臂轴的
o
cker Arm
a
Shaft
磨
损、毁坏、
坏
现象严重
或
换
新的摇臂。
r
arm for
w
m
roller for
a
a
mage or f
o
k
er arm roll
e
with a new
o
有
磨损现象，
臂
轴。
arm shaft f
o
e
rocker a
r
e
w one.
共
的
检查
Valve Spri
n
门杆有不正
常
极
限值：
and burnin
w
ear; meas
u
Maintenan
c
5
mm
width of
c
磨
蚀不均匀
或
证
密封性能，
o
f valve is
or in abn
o
,
which c
a
e
rformanc
e
检查
a
nd Rocke
r
摇臂滚轮的
轴
摇臂滚轮的
轴
w
ear and d
a
a
xial cleara
n
o
r excessiv
e
e
r, the rock
e
o
ne.
如果磨损现
象
o
r wear; in
c
r
m shaft s
h
共
50 页第
Page 10 of
5
ng
常的磨
g, and
u
re the
c
e limit
c
ontact
或
与气
均应
very
o
rmal
a
nnot
e
, the
r
Arm
轴
向间
轴
向间
a
mage,
n
ce; for
e
axial
e
r arm
象严重
c
ase of
h
all be
排
气
标
识
Exh
sha
f
10 页
5
0
气
摇臂轴
识
“P”
aust rocker arm
f
t marked with "P"
排气摇
臂
Exhaus
t
arm
进气摇臂轴
标识“J”
Intake rocke
marked with
臂
t
rocker 进
气
Int
a
e
r arm shaft
"J"
气
摇臂
a
ke rocker arm