Page 198 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

9 Ignition coil windings check up
a Connect the multimeter and select the resistance mode
b Connect the multimeter lead to the primary coil terminal. If primary winding resistance is between 0.5 to 2.0
ohms. It means it is in good condition. If the multimeter reading is less than 0.5 ohms that primary windings
is short circuited. If the reading is infinite value, it indicates the primary winding is open.

c Connect the multimeter leads from secondary coil terminal to one of the primary winding terminal. If the
resistance value is 8000-20000 ohms, it is in good condition and if it is less than 8000 ohms secondary
winding is short circuited. Infinite reading value is shown in the multimeter the secondary winding is open
circuit.
10 Set the ignition Timing
• Rotate the crank shaft till TDC marks on the pulley.

• Flywheel coincides with the timing mark pointer.
• Open the distributor cover.
• Ensure the 1st cylinder piston at TDC compression stroke. If it is not in compression stroke, rotate the
flywheel one complete turn.

• Turn the flywheel /Pulley in anticlockwise direction and match the timing mark at before TDC 5° position.
• Note down the CB point is just open condition in the distributor. If not adjust it properly by turning the
distributor.

11 Checking of ignition timing using timing light
• Connect the timing light to battery and HT wire of 1st cylinder spark plug
• Start the engine
• Pass the timing light on timing marks and check the timing marks coincides before TDC 5° at Idle speed of
engine. If not adjust the distributor.
• Recheck the ignition timing using ignition timing light.

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CITS : Automotive - Mechanic Diesel - Exercise 11.3 CITS : Automotive - Mechanic Diesel - Exercise 11.3