Great Wall engine 4G64S4M. Manual - part 8

 

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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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