TTEC4843 - ignition off car & on car

TTEC4843 - Fuels and Fuel Systems -  practical

2/9/2011 tuesday

start = 1.00pm finsh = 4.30pm

In todays task we started on testing distributor components fo serviceabillity

first thing we started with was obtain and test 3 vacuum advance unit for serviceabilility.

Then we tested The distributor by using a mity vacuum.

Then we got the Vacuum unite test results which we had.

mm/ hg( mercury ) held = 10

did the diaphgram linkage move? no

did the diaphgram hold vacuum ? yes

That showed us our vacuum is in good condition no false things had to it.

Then we moved on  testing ignition coils.

First thing we did was to obtain 2 ignition coils with different part numbers nos.

Then we obtained a mulitimeter by setting it to 200 ohm . 

which we had our coil test results.

coil - primary 2.3 ohms              Pass

coil 1 secondary oL                   fail

That showed us our primary is in good condition and it it reached it spec which was 2 - 8 ohms

Then our seconday failed which had no reading going to the multimeter . which we could replace it or replace the whole ignition coil.

Coil 2 - primary OL  =        fail

coil 2 - secondary 6 kohms    =    fail

That showed us our primary had a false reading which we didnt get a reading .

Then our secondary had a reading of 6 kohms which its a fail test it didnt meet it spec which was 18 kohms.

Over all the test we did  on the ignition coils wernt what we expacted. so that showed us we if they dont work throw them out and buy new once.

Then we moved on by testing ballast resistors.

first thing we did was to obtain 2 ballast resistors with different part numbers.

first thing we did was to measure the resistance valuse which  we had

ballast resistor No1 measured ohms = 1.7 ohms    pass

ballast resistor No 2 measured ohms =   1.7 ohms  pass

we check the ballast resistors with a mulitmeter setting it to 200 ohms. that showed us they are in good condition and meeting the spec.

Then we moved on by testing current and voltage drop of the ballast resistor and the iganition coils.

first thing we did was wire up a ballast resistor in series with 2 individual coils that have different primary winding values.

Then insert a amp meter in series and note the current value.

Then measured and note the voltage drop across the ballast resistor.

Coil 1 No Ic,3

Coil 1 voltage drop = 5.96 v

ballast resistor voltage drop = 6.37 v

Coil 1 primary current value = 3.55 amps

Coil 2 No 11 c 12

Coil 1 voltage drop = 8.17 v

ballast resistor voltage drop = 4.26 v

Coil 2 primary current value = 2.44 v

This showed us our testing stall current value and voltage drop is good and we had good reading as we spose to. that showed us the coils and the ballast resisor we reading and they were in good condition.

The next task was to statically timing an engine.

• first the was remove the distributor cap and hi tension leads from engine
• remove the spark plugs frm the cylinder head
• remove the distributor ( disconnect the low tension cable connection ).
• remove the tappet cover assembly
• remove ignition key from ignition switch ( for your safety )

Then we set to correct engine rotation by assambling the crakshaft at .5 before top dead centre. by doing that we rotated the crankshaft clockwise.