TTEC4842- AUTOMOTIVE ENGINES (Cooling system)

      TTEC4842- AUTOMOTIVE ENGINES (cooling system) 

                     ENGINES- Cooling system

                                         


Important: while carrying out the tasks to check the cooling systems remember the engine may be moving parts that could injure if your hands or other body parts come into contact with them.
Safety: 

• Hot metal parts of the system can burn.
• Hot water and steam scalds and burns.
• The cooling system is under pressure when hot.
• Injury from moving parts of the engine.
• Corrosion and anti freeze splkashes in the eyes.
• Personal injury from hand tools.

Indirect cooling: To complete this practical task  we need an indirect (liquid) cooled engine that is complete and working.
Here we learn how to check the radiator visually for security of the mounts. when we checked the radiator core for corrosion , we rubbed the hand gently over fins and see if they are flaking off.

and for leaks at the top and bottom of the tank were seen by detection of  stains or white powdery deposits along tank seams.

REPORT: Hoses were in good condition, no leaks around the cap & no leaks n damage to top & bottom tank, condition of fins n tubes not much good.

CHECKING COOLANT  ANTIFREEZE SPECIFIC GRAVITY:Engine coolant should have a antifreez & a corrossion inhibitor in it. Then we checked ratio of the coolant mix usingcooling system hydrometer.

My Reading was: 10%
Which was out of manufacturers spec., n most spec are 50%

Q.Then we were asked 'If the capacity of the cooling system is 8 litres, then what action needs to be taken in bring the coolant to manufacturer's specifications?
= So as our result is 10% , so 90% is my water that means 7.2L water is inside radiator so we need to take out 3.2L of water and add  3.2L of coolant to make it 50% of water & 50% of coolant.


CHECKING RADIATOR HOSES:Here we learn to check the radiator hoses, which can be seem quite serviceable from outside, but perished on the inside .
then we checked it for the internal flaking, oil soaked or swollen , and hard and cracking.


other faults check:
                                     TOP hose         Bottom hose 

Hardening                      ok                       ok                                       
Cracks                            ok                      ok                                    
Internal flaking             ok                       ok                                             
Chaffed or burned        ok                      ok                                          
oil soaked or swollen     ok                      ok            



So, no damages were detected while checking the hoses.




THERMOSTAT INSPECTION:
Here we learn to check the thermostat against manufacturers specification.


The thermostat manufacturers specification.= 86degree C.
Then i checked the thermostat by putting in boiling water along with the temperature reader. And kept till the thermostat open.

Thermostat opened at 92degree C.
Specs. 86degree C.
Thermostat was within the specs.? NOActions to bring thermostat within specs? We have to replace it with the right manufacturing specs. thermostat.


VISUAL CHECK OF RADIATOR PRESSURE CAP:

Q. Check the radiator cap for visible damage and report findings?
No visual damage.
Q.Check the sealing surfaces to ensure that they are in good order and report findings?
Pressure valve seal full of cracks , so replace the cap with the manufacturers specs.
Q.Locate the radiator cap vacuum valve is working correctly and report when it operates and what its purpose is?
vaccum valve working good , opens n closes at good time.



Then I,checked the cars radiator cap pressure and checked & determined  correct opening pressure..


At what Pressure should cap release at? 13psi
Whats pressure  did the cap release at ? 11 psi
Is this within the manufacturing specification? N/A
REPORT: Replace it with the same manufacturing  specs which is 13psi.

PRESSURE TEST THE COOLING SYSTEM:
Using a cooling system pressure tester, we checked the cooling system for leaks, to manufacturers specification on the radiator cap.

Manufacturer's pressure release specification? 13psi
Then check for the any leaks in the following areas like RADIATOR TANKS, radiator & heater hoses, heater core, cylinder head gasket , frost plugs, water pump ...etc. SO EVERYTING WAS ALL GOOD.

ACTIONS TO REPAIR LEAKS? Relace seals and gasket.




FAN BELT INSPECTION:

Here we checked the the condition, check it for cracking or deterioration, checked the sides for signs of slipping & checked fr signs of wear.

FAN BELT NUMBER:- 11A0965
Checked the "v" of the belt against the "v" of the pulley
Is the "v" correct for the vehicle? yes
Is the lenght of the belt correct for the vehicle? yes
Is belt serviceable? yes
If the belt is not suitable for further , action required? we have to replace fan belt with the same specs one.

WATER PUMP BEARING TEST:We learn to check the water pump pulley for damagesand signs of leakage, check the pulley shaft for any play and bearing for any noise by spining.

REPORT: Water pump is all in good  condition, there is no buzzing sound from the bearing or any leaks.

REFIT THE FAN BELT:HERE we refitted the fan belt using the given instruction.

Correct tension for the belt for our vehicle is 5mm.
And using a fan tension gauge I,determined the tension.

ADJUST THE DRIVE BELT:
 Here we learned to adjust the drive belt as all belts have some form of mechanical adjustments. So we folled the give manual loaded with all th steps during its adjust.

ELECTRICAL COOLING FAN:
And in last we checked the the operation of the electrical cooling fan by some simple test.

Here we located and disconnected the water/thermo switch connection, switch the ignition on.....if, the fan operates the fan is ok.

DOES THE FAN OPERTAES?? YES