AIR CLEANER GP 4497366 - Caterpillar

Inspect the body of transformer (3) and ground spring (5). Verify that there is no corrosion nor damage. Verify that the screws for ground spring (4) are secure.
Inspect secondary terminal (7) for corrosion and/or for damage.
Inspect O-ring seal (9) inside extension (8) for damage.
Check for a secure connection between the transformer and the spark plug.Note: Punch through is caused by misfire in the engine that does not generate a diagnostic code.
Check extension (8) near spacer (6) for signs of punch through (pin holes) and/or of arcing.
The extension can be scratched and damaged with a wire brush. Do not use a wire brush on the extension.
Clean any deposits from the inside of the extension. Use a 6V-7093 Brush with isopropyl alcohol.Expected Result:The transformer is in good condition.Results:
OK - The transformer is in good condition. Proceed to Test Step 3.
Not OK - An inspection found a problem with the transformer.Repair: Repair the transformer, when possible. Replace the transformer, if necessary. Be sure to use the correct transformer for the G3500B Engine.Reset the control system. Restart the engine. Clear the logged codes. Stop.Test Step 3. Check the Primary Circuit and the Secondary Circuit
Illustration 3 g01091176
Schematic for the primary circuit and for the secondary circuit (10) 2-pin connector for the transformer (11) + Terminal (12) - Terminal (13) Flyback diode (14) Blocking diode (15) Primary coil of the transformer (16) Secondary coil of the transformer (17) Resistor (18) Spark plug gap
Measure the primary circuit by checking the voltage of blocking diode (14) .
Illustration 4 g01091178
Ignition transformer and extension (11) + Terminal (12) - Terminal (4) Screw for the ground spring (7) Secondary terminal for the spark plug
Set the multimeter to the diode scale. Connect the multimeter leads to terminals (11) and (12) of the 2-pin connector. The polarity of the leads is not important. Measure the voltage between the terminals. Record the measurement.
Reverse the multimeter leads. Measure the voltage between the terminals again. Record the measurement.
Measure the resistance of the secondary circuit.Note: The resistance of the secondary coil will vary with the temperature. Illustration 5 demonstrates the relationship between the secondary coil's resistance and the temperature. A reading that is within 1000 Ohms is acceptable. For example, if the transformer's temperature is 60 °C (140 °F), the correct resistance is between 21,000 and 23,000 Ohms.
Illustration 5 g00863850
Resistance versus temperature (Y) Resistance in Ohms (X) Temperature in degrees celsius (degrees fahrenheit)
Set the multimeter to the 40,000 Ohm scale. Measure the resistance between the screw for the ground spring (4) and the secondary terminal for the spark plug (7) .Expected Result:For the primary circuit, one of the voltage measurements is approximately 0.450 VDC. The other voltage measurement indicates an open circuit.For the secondary circuit, the resistance between the screw for the ground spring and the secondary terminal for the spark plug is within the acceptable tolerance.Results:
OK - All three of the measurements are correct. Proceed to Test Step 4.
Not OK - At least one of the measurements is incorrect.Repair: Make sure that the engine control switch to