Great Wall engine 4G64S4M. Manual — part 8
11-26
ENGINE
ROCKER ARM AND CAMSHAFT
MD998448
6AE0160
9EN0058
roller end
7EN0064
outside claean
inside clean
fill didsel oil
A
B
C
6EN1698
diesel oil
6EN1699
NOTES FOR DISASSEMBLY
(1)
Before disassemble the rocker arm and rocker shaft
assembly, use the tools as shown in the figure to
prevent hydraulic lifter from falling.
CHECK
CAMSHAFT
(1)
Measure the height of camshaft
Standard value and operating limit are as follows:
Air intake
4G64-D-L3
37.39
36.89
Air exhaust
4G64-D-L3
36.83
36.33
ROCKER ARM
(1)
Check the roller surface, in case of existence of any trace
indicates there are damages or blockades, the rocker arm should
be replaced.
(2)
Check if the roller can rotate smoothly. If not or slacked, the
rocker arm should be replaced.
(3)
Check the inside diameter. In case of damages or blockages, the
rocker arm should be replaced.
HYDRAULIC LIFTER
NOTES:
1. Hydraulic lifter is a precise part. There shouldn
t be any
dust and foreign body, etc.
2. Do not disassemble the hydraulic lifter.
3. Clean the hydraulic lifter with clean diesel oil.
(1)
Prepare 3 vessels and about 5 litres of diesel oil. Pour enough
diesel oil into each vessel until the erect hydraulic lifter is
submerged, then take the following steps to operate the hydrau-
lic lifter:
(2)
Put the hydraulic lifter into vessel A to clean its external surface.
NOTES:
Use a nylon brush to remove hard attachments.
Type
Standard value
Limit value
A
11-27
ENGINE
ROCKER ARM AND CAMSHAFT
MD998442
MD998441
diesel oil
6EN1700
MD998441
MD998442
diesel oil
6EN1701
MD998441
MD998442
6EN1700
MD998441
6EN1701
diesel oil
(3)
Mount the special tool MD998441 onto the hydraulic lifter.
(4)
Use the special tool MD998442 to lightly expel the steel ball
inside the lifter and make it move 5-10 strokes until it can move
smoothly. Additionally, it can also eliminate resistance of the
plunger. Such operation can remove dirty oil.
NOTES:
Since the steel ball spring is extremely soft, so do not overexert
while impelling steel ball with air leak wire lest the hydraulic
lifter is damaged.
If the plunger can
t move smoothly or mechanical devices
seem abnormal, replace the hydraulic lifter.
(5)
Take the hydraulic lifter out of the vessel, then lightly expel the
steel ball and move the plunger, remove diesel oil away from
pressure chamber.
(6)
Mount the special tool MD998441 onto the hydraulic lifter.
(7)
Put the hydraulic lifter into vessel B, then use the special tool
MD998442 to lightly expel the steel ball inside the lifter and
make it move 5-10 strokes until it can move smoothly. Such
operation can clean the pressure chamber of hydraulic lifter.
NOTES:
Since the steel ball spring is extremely soft, so do not overexert
while impelling steel ball with air leak wire lest the hydraulic
lifter is damaged.
(8)
Take the hydraulic lifter out of the vessel, then lightly expel the
steel ball and move the plunger, remove oil away from pressure
chamber.
11-28
ENGINE
ROCKER ARM AND CAMSHAFT
(9)
Put the hydraulic lifter into vessel C, then use the special tool
MD998442 to lightly expel the steel ball inside the lifter.
NOTES:
Don
t clean the hydraulic lifter in vessel C. Otherwise foreign
body may enter the pressure chamber which is full of oil.
(10) Stick the hydraulic lifter up straight with its plunger at the top,
stably move the plunger downwards to its maximum stroke, then
pull it back slowly, and then release the steel ball to make the
pressure chamber full of diesel oil.
(11) Remove the special tool MD998441.
(12) Take the hydraulic lifter out of the vessel, stick it up straight with
its plunger at the top, stably impel the plunger until it can
t
move any more. Check and compare the height difference
between the plunger and the new hydraulic lifter.
NOTES:
If the hydraulic lifter becomes shorter, repeat step (9) to (12) and
fully fill the hydraulic lifter with diesel oil. If it still becomes
shorter after repetition of these steps, replace the hydraulic lifter.
(13) Mount the hydraulic lifter onto the special tool.
(14) After the plunger sink down (0.2~0.5mm), measure the time
taken for the plunger to sink down another 1mm.
Standard value: 3
20 sec./1mm ( use the diesel oil with a
temperature of 15
20)
Notes:
If the measured value doesn't conform to the standard, replace the
hydraulic lifter.
(15) Mount the special tool MD998441 onto the hydraulic lifter.
(16) Put the hydraulic lifter into vessel C again, then lightly impel the
steel ball inside the lifter downwards with special tool MD998442.
(17) Stick the hydraulic lifter up straight with its plunger at the top,
stably move the plunger downwards to its maximum stroke, then
pull it back slowly, and then release the steel ball to make the
pressure chamber full of diesel oil.
(18) Remove the special tool MD998441.
MD998442
6EN1702
MD998441
MD998442
MD998441
6EN1703
6EN1704
6EN1705
MD998440
scale=1mm
MD998442
MD998441
6EN1706
hydraulic
tappet
11-29
ENGINE
ROCKER ARM AND CAMSHAFT
(19) Take the hydraulic lifter out of the vessel, stick it up straight
with its plunger at the top, stably impel the plunger until it can
t move any more. Check and compare the height difference
between the plunger and the new hydraulic lifter.
NOTES:
If the hydraulic lifter becomes shorter, repeat step (15) to (19)
and fully fill the hydraulic lifter with diesel oil. If it still becomes
shorter after repetition of these steps, replace the hydraulic lifter.
(20) Keep the hydraulic lifter vertical lest the diesel oil overflows.
Prevent the hydraulic lifter from being contaminated by dirt or
foreign body and mount the hydraulic lifter onto the engine as
quickly as possible.
NOTES FOR MOUNTING
MOUNTING OF OIL SEAL
MOUNTING OF HYDRAULIC LIFTER
(1)
Insert the hydraulic lifter into the rocker arm (be careful not let
diesel oil overflow), then use the special tool to prevent it from
falling.
NOTES:
If the hydraulic lifter is used repeatedly, it must be cleaned.
6EN1704
9EN0060
MD998713
6AE0161
MD998443
hydraulic lifter
A
B
MOUNTING OF ROCKER SHAFT SPRING,
ROCKER ARM AND ROCKER SHAFT
(1)
Temporarily screw down the intake rocker shaft with bolt until
the rocker arm doesn
t push and press the valve.
(2)
Mount the rocker arm spring from the top and make it perpen-
dicular to the spark plug guide.
NOTES:You should mount rocker shaft spring first, and then the
exhaust rocker arm and rocker shaft.
(3)
Remove the special tool which is mounted for the purpose of
holding the hydraulic lifter.
(4)
Confirm that the cutting edge on the rocker shaft is in the
location as shown in the figure.
6AE016
6AE016
C
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