Chery Tiggo T11 LHD. Manual — part 79



When the bolt is excessively tightened,
it should be fully loosened and then
begin to be tightened again from step
(1).

3

、Check



Cylinder cover

(1)

Check the flatness of the bottom of cylinder

cover with straightedge and plug gauge.
Standard value: 0.03mm
Limit value: 0.2mm

(2)

When the distortion exceeds the limit value,

modification by abrasion is needed.
Abrasion limit value: * 0.2mm
*Together with the abrasion of cylinder
block.
Height of cylinder cover(standard value of
new part): 119.9

～120.1mm



valve

(1)

Check whether the working surfaces of valve

are contacted properly. If the contact is
improper, abrade again with valve polishing
machine. The contacting side of valve seat
should be conformed to the center of valve
working surface.

(2)

If the edge thickness exceeds the usage limit

value, the valve should be replaced.
Edge thickness standard value:
intake. . 1.0mm
exhaust. . 1.2mm
Usage limit value: intake. .
0.5mm
exhaust. . 0.7mm

(3)

Measure the total height of valves. If it is

smaller than the limit value, the valve should be
replaced.
Standard value:
intake: . . 112.30mm
exhaust. . 114.11mm
Limit value:intake. . 111.80mm

exhaust. . 113.61mm



Valve spring

(1) Check the free height of the valve spring. If it is
smaller than the limit value, it should be replaced.

Standard value: 51.0mm
Limit value: 50.0mm

(2) Check the verticality of spring central line and the
bottom surface. If the gradient exceeds the limit
value, it should be replaced.

outer diameter

of valve rod

inner diameter

of valve duct

contact position (in the
center of the splay)

edg
e
thick

included angle between spring central
line and bottom surface vertical line

spring

free

height

valve duct

Standard value: ≤2°
Limit value: 4°



Valve duct

(1) Check the clearance between the

valve duct and the valve rod. When
the clearance exceeds the limit
value, the valve duct or the valve or
both of them should be replaced.
Standard value: intake. .
0.02

－0.05mm

exhaust. . 0.03

－

0.07mm

Limit

value:

intake. . …0.10mm

exhaust. . …
0.15mm



valve seat

(1)Assemble the valve and measure the flange height of

valve rod between the end of valve rod and seat
surface of valve spring. If the measurement value
exceeds the assigned limit value, the valve seat
should be replaced.

Standard value: intake. . 49.30mm
exhaust. . 49.30mm
Limit value: intake. . 49.80mm
exhaust . . 49.80mm



Points for maintaining the valve seat

(1) Before maintaining the valve seat, check the clearance

between the valve duct and the valve rod. Maintain
after replacement of valve duct if necessary.

(2) Repair the width and angle of the valve seat until their

adjustment to the assigned value with abrasion
machine.

(3) After repairing the valve seat, rub the valve and the

valve seat in pairs with rubbing cream. Then check the
flange height of valve rod. (Refer to the checking item
of valve seat).



Points for changing valve seat

(1)Cut a part of the to-be-replaced valve seat from the

end

of

valve rod

flange height

of valve rod

seat surface

of

valve

spring

cut off

height of valve
seat washer

enlarge

the

inner

diameter

inner side to make it thinner and then
remove it.

(2)Repair and adjust the seat hole in cylinder

cover according to the outer diameter of the
enlarged valve seat.

Diameter of valve seat washer

intake

valve seat

enlargement size 0.30

34.435-34.455

enlargement size 0.60

34.735-34.755

exhaust

valve seat

enlargement size 0.30

31.935-31.955

enlargement size 0.60

32.235-32.255

(3)Before assemble the valve seat

washer, heat the cylinder cover to
the temperature of about 250

℃, or

cool the valve seat washer in the
liquid nitrogen in order to engage
inside the cylinder cover.

(4)Repair and adjust the valve seat to

the assigned width and angle with a
valve seat milling cutter. (Refer to
Points for maintaining the valve
seat).

flange value

Points for changing of valve duct
(1) Press out the valve duct to the

direction of cylinder with press
machine.

(2) Modify the valve duct hole of cylinder

cover until the hole diameter gets to
the size of enlarged valve duct to be
installed.

。Caution:

Do not use a new valve duct with the
same size as the disassembled valve
duct.
Duct hole diameter of valve in the
cylinder cover.

enlarge size 0.05

： 11.05-

11.068

enlarge size 0.25

： 11.25-

11.268

enlarge size 0.50

： 11.50-

11.518

(3)As shown in the illustration, press the

valve duct to the assigned flange
value.
Standard value: 14mm
Caution:
。Press the valve duct from the top
surface of cylinder head.
。 the length of intake valve duct

and exhaust valve duct are
different.

(Intake valve

：

45.5,exhaust valve

：50.5）

(4)After installation of valve duct, insert

the new valve and check if it could
move smoothly.