TTEC4843 :- FUELS AND FUELS SYSTEM

TTEC4843: Ignition Off CAR & ON CAR



>In this we started with testing distributor components for serviceability.

Here we obtain and test 3 vacuum advance units for serviceability.

• We will use Mini -Vac name tester. 
• And before carrying out serviceability tests on the vacuum operated components- we should release the excess pressure by the valve in mini vac.

our vacuum unit test result:

1. mm/hg (mercury) held:- 65
   
   Did the diaphragm linkage move:-yes
   Did the diaphragm hold vacuum:- yes
   So, doesn't need any service, vacuum is in good condition.
2. mm/hg (mercury) held:- 71
   
   Did the diaphragm linkage move:-yes
   Did the diaphragm hold vacuum:- yes
   So, doesn't need any service, vacuum is in good condition.
3. mm/hg (mercury) held:- 69
   
   Did the diaphragm linkage move:-yes
   Did the diaphragm hold vacuum:- yes
   So, doesn't need any service, vacuum is in good condition.

Now we have to test the ignition coils:

• Firstly we have to obtain the 2 coils with different part numbers nos.
• Then list all coils part numb, voltage, internal resistance specification as per specification manual.

coil specification:

• coil 1 no: C6R-500
  coil 1 voltage: 12V
  coil 1 primary: 3.4
  coil 1 secondary: 7.84 kohm
• coil 2 no: C1T-118
  coil 2 voltage: 12V
  coil 2 primary: 3.5
  coil 2 secondary: 9.2 kohm

REMEMBER:
Always check the meter error and deduct that value off your final reading.
>.5ohm(our value result)


(most important when using the 0-200 ohm scale)The test result after deducting the error from the above result.
coil 1 primary: 2.9
coil 1Secondary: 7.34
coil 2 primary: 3
coil 2 Secondary:  8.7

*>That showed us our primary is in good condition and has reached itz spec which is 2-8.*>For secondary itz fail as it couldnt reach itz specification which is 18 kohms.

so , as a result change d coils if the result out of spec. n that means d coils r need to be replaced.


Now we have to test the ballast resistors:

1. obtain 2 ballast resistor with different part numbers.
2. list part numbers and resistance specification.
3. Then have to measure the resistance of resistors.

SPECIFICATION:

*Ballast resitor 1No: 2.0ohm.               *Ballast resistor no.2: 2.3ohm
*Ballast resistor no.1 ohm spec. : 1.6ohm. *Ballast resistor no.2 ohm spec:1.6ohm.

MEASURED RESISTANCE VALUES:

Ballast resistor no.1 measured ohms:- 1.6 > pass
Ballast resistor no.2 measured ohms:-1.9 > fail 

we check the ballast resistor with the multimeter setting it on 200 ohms that showed us that one is in good condition and other one is fail, not in specification.

Then we moved on by Testing stall current and voltage drop.

1. Firstly wire up the ballast resistor in series with two individual coils that have different primary winding valve. (U NEED TWO MULTIMETERS FOR THIS)
2. insert amp meter in series and note the current flow valve.
3. And then measure the note the voltage drop across the ballast resistor and coil primary.

 COIL 1 NO:  Su 12RCOIL 1 VOLTAGE DROP : 6.0 v

BALLAST RESISTOR VOLTAGE DROP: 5.7v
COIL1 PRIMARY CURRENT VALUE: 4.20 amp

COIL 2 NO: C6R-500
COIL 2 VOLTAGE DROP: 0.3V
COIL 2 PRIMARY CURRENT VALUE: 10 AMP

This shows us the result that the testing stall current value and voltage drop is good and we had good reading as we spose too, that showed us coils and ballast resistor...r in good condition for one n not for other.



THE NEXT TASK WAS TO STATICALLY TIMING AN ENGINE: 

                                                                                                          

1. Firstly we removed the distributor cap and high tension leads from the engine.
2. Then remove the sparks plugs from the cylinder head.
3. remove the distributor (disconnect the low tension cable connection)
4. remove the tapped cover assembly.
5. remove ignition key from ignition switch , for your safety

THEN WE ADJUSTED THE CRANKSHAFT ON .5 BEFORE TOP DEAD CENTER. SO AS TO SET CORRECT ENGINE ROTATION.