The ignition coil is a transformer, on the iron core of which the secondary is wound, and on top of its primary winding

The core with windings is installed in a sealed steel case filled with oil and closed with a high-voltage plastic cover.

Maintenance of the ignition coil

To prevent a possible breakdown of the plastic cover, the ignition coil must be cleaned of dirt, dust and oil, check the reliability of fastening of high and low voltage wires.

Removing the ignition coil

Unscrew the nuts 1 and disconnect the low-voltage wires from the coil terminals 3.

Disconnect high voltage wire 4 from the ignition coil.

Unscrew nuts 2 and remove coil 3.

GAZ-2705 ignition coil with ZMZ-402 engine

Ignition coils B116 and B116-01 are checked at the stand mod. K–295.

The coil must ensure uninterrupted sparking on a spark gap with a gap of 7 mm at a speed of rotation of the ignition distributor shaft of at least 2500 min–1.

Inspect the coil.

If there are chips, cracks, signs of heating or oil leakage on the plastic cover, replace the coils.

Check the primary resistance of the ignition coil by connecting an ohmmeter between the low voltage terminals.

The ohmmeter should show a resistance of 0.48-0.72 ohms.

Then check the resistance of the secondary winding by connecting an ohmmeter between the high voltage terminal and the "K" terminal of the coil.

The ohmmeter should read between 13,200 and 19,800 ohms.

If the measured parameters differ from those indicated, the coil must be replaced.