Title Minyak Enjin

7/31/2019 Title Minyak Enjin

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TITLE: Perform automatic transmission service

SPECIFIC OUTCOMES:

Upon completion the task, students should be able to:

1) Execute automatic transmission on road test

2) Execute automatic gear oil flushing3) Change automatic transmission oil

4) Execute transmission oil level check

5) Execute automatic gear changing test

6) Execute automatic transmission pressure test

TOOLS & EQUIPMENTS:

No Component Quantity

1 Spanar set 1 set

2 Screwdriver set 1 set

3 Special tool

a. MD998316 dial gauge support 1 unit

COMPONENTS:

No Component Quantity

1 Automatic transmission gearbox 1 unit

SAFETY PRECAUTIONS:

1. Understand the safety procedures specified by the lecturer.

2. Always aware, any machine or tool used in the practical task.

3. Do your task in an organized manner as this can

minimize the risk of accident occur.

4. Read and follow the experimental method and check with the

lecturer if any problem occur.

THEORY :

An automatic transmission contains more heat-generating parts than a manualtransmission. When an automatic transmission has warmed up after some distance of normal

driving, the temperature of the ATF in the oil pan is as high as 80C. When the vehicle has

been driven up a long slope or the engine has run at high speeds, the temperature may even

be 100C or higher. At extremely high temperatures, the ATF and the friction materials used

in transmission components generally start deteriorating. For this reason, a variety of

measures are incorporated in the automatic transmission to minimize heat resulting from

operation under demanding conditions. The cooling system is based on circulation of the

ATF through an oil cooler, which is itself cooled by air or water. The oil cooler is generally

incorporated into the radiator and is connected to the automatic transmission by two oilcooler

tubes; one for outflow fluid and the other for inflow fluid. Heated ATF in the torque

converter is directed to the oil cooler and after being cooled by the oil cooler, is directed tovarious transmission components to lubricate them. After being used as lubricant, the ATF


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collects in the oil pan.

Automatic transmission fluid (ATF) contains several types of additive. The additives

optimize the ATFs frictional characteristics, maintain adequate and consistent viscosity from

high to low temperatures, and suppress formation of bubbles. The additives, however, are not

immune to deterioration. They, and in turn the ATF, deteriorate over time (more quickly if

the vehicle is used under severe conditions). When ATF deteriorates badly, increased shockis felt during gearshifts and operational reliability of the clutches and brakes can be affected.

ATF that has deteriorated must be replaced. To determine whether ATF is good or no good

on the basis of its colour, recommendation is to use a test tube or a small-size beaker.

ATF is used for multiple purposes including lubrication and hydraulic actuation,

so the ATF level must be carefully controlled. If the level is too low, the oil pump may

suck air together with ATF, leading to insufficient control-valve pressure and inaccurate

movement of valve elements. Also, insufficient pressure can make the clutches and

brakes slip, making satisfactory gearshifts impossible. Other problems caused by a low

ATF level include poor lubrication and cooling. If the ATF level is too high, the clutch

retainer and other rotating parts may agitate the fluid. As the ATF gets hot when it is

agitated by these rotating elements, the life of the fluid may be shortened. Bubbles

generated by agitation may also give rise to problems.

The total quantity of ATF in the automatic transmission is as much as 6-8 liters.

Most of the ATF is contained in the torque converter and hydraulic circuit. One-third or

one-fourth of the total quantity of the ATF is in the oil pan during operation of the

automatic transmission. When the engine is shut down and the automatic transmission

stops operating, the ATF level in the oil pan rises greatly as some of the ATF in the torque

converter and hydraulic circuits drains into the oil pan. Since the ATF level in the oil panis not always the same, measuring the level when the engine is not running is pointless.

Ones must measure the level using the specified method when the ATF is in the specified

temperature range.


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PROCEDURE (ON ROAD TEST):

DIAGRAM PROCEDURE

1) Engine should be started in P (Park)

position where engine power is not

transmitted by transmission. Depress the

brake pedal.

2) Push the button and move the lever from P

(Park) to R (Reverse). Reverse gear will

engage and vehicle will start moving

backward.

3) Push the button and move the lever to N

(Neutral) position. Gear will be free from

engagement.

4) Move lever to D (Drive) position. 1st will

engages and vehicle starts to move forward.

Gear will increase to 2nd, 3rd and 4th if fuel

pedal is depressed.5) Move lever to 3 (3rd speed) position. Gear

will not increase higher than 3rd gear.C

4

6) Move lever to 2 (2nd speed) position. Gear

will not increase higher than 2nd gear.

7) Move lever to L (Low) position. Gear will

be fixed at 1st gear.

8) Reverse step 6 to 1.


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PROCEDURE (CHANGE TRANSMISSION OIL):

1) Park the vehicle on a flat surface.

2) Warm up the car to normal operating temperature (70C to 80C).

3) With the engine off, position the drain pan under the transmission pan and drain the fluid

by loosening the pan bolts. Loosen one corner more than the rest to direct the flow intothe drain pan.

4) Finish removing the transmission pan bolts, and lower the transmission pan down

carefully (Some fluid is still in the transmission pan).

5) Remove the old filter and discard. Make sure filter O-rings or seals are discarded with the

filter.

6) Install the new filter by using the same bolts or clips and use a new O-ring or seal.

7) Inspect the pan before cleaning. A small amount of fine gray clutch dust is normal.

However if find metal shavings, there could be a mechanical malfunction or transmission

damage.

8) Clean the transmission pan thoroughly with solvent and wipe dry so there is no harmful

residue. Clean the transmission and transmission pan mating surfaces of all gasketmaterial being careful not to damage the surfaces.

9) Position the transmission pan gasket on the pan.

10)Hand-tighten the transmission bolts in a crisscross pattern until snug. Use a torque

wrench to tighten the bolts to 11 Nm.

11) Refill the transmission through the dipstick fill hole.

12)With the vehicle on level ground recheck the fluid level. Check the transmission and lines

for leaks.

PROCEDURE (OIL LEVEL CHECK):

DIAGRAM PROCEDURE


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1) Park the vehicle on a flat surface.

2) Raise the ATF temperature to 70C to

80C.

3) Let the engine run at idle.

4) Move the selector lever through all

positions to fill the torque converter andthe hydraulic circuits with fluid, and

then move the selector lever to the N

position.

5) Pull the dipstick and check the level of

transmission fluid.

6) ATF should be in hot range.

PROCEDURE (GEAR CHANGING TEST):

1) Start the engine.

2) Depress the brake pedal and move gear selector to D (Drive).

3) Rotate the gear selector knob on the ECT Analyzer to the 1-2 position. The transmission

will shift to second gear.

4) Press and hold the first gear button. The transmission will shift to first gear.

5) Release the parking brake.

6) Accelerate to 10 mph (16km/h).

7) Release the first gear button. The transmission should shift to second gear.


9) Rotate the selector knob to the number 3 position. The transmission should shift into

third gear.


11) Rotate the selector knob to the number 4 position. The transmission should shift into

fourth gear.

12) Release the accelerator and coast.

13) Rotate the selector knob to the number 3 position. The transmission should downshift

into third gear.

14) Apply the brakes, and stop the vehicle. Testing is complete.

PROCEDURE (HYDRAULIC PRESSURE TEST):


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DIAGRAM PROCEDURE

1) Warm up the engine until the

automatic transmission fluid

temperature is 80C100C.

2) Jack up the vehicle so that the wheels

are free to turn.3) Connect the special tools (2,942 kPa

oil pressure gauge [MD998330] and

joints [MD998332, MD998900] to

each pressure discharge port.

4) Measure the hydraulic at each port

under the conditions given in the

standard hydraulic pressure table and

check that the measured values are

within the standard value ranges.

5) If a value is outside the standard

range, correct the problem whilereferring to the hydraulic pressure

test diagnosis table.


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RESULT (GEAR CHANGING):

RESULT (HYDRAULIC PRESSURE):


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DISCUSSION & CONCLUSION:

1) Describe the functions of automatic transmission fluid.

2) Why we need to change automatic transmission fluid periodically?

3) Automatic transmission dipstick contains 2 levels (H and C) which are different with

engine oil dipstick (high and low). What does H and C means? How does it function?

REFERENCES:

1) Automatic Transmission F4A41, F4A42, F4A51 Service Manual (Mitsubishi Motors

Corporation), May 20022) Automatic Transmission Training Textbook (Proton Holdings Bhd)

3) Automatic Transmission Inspection Sheet (Proton Holdings Bhd)

Documents

Title Minyak Enjin