The ignition coil is one of the most important elements in the ignition system. It has the important job of converting low-voltage electrical current originating from the battery to extremely high-voltage current that's used to create the spark serves to initiate the internal combustion process that powers your vehicle. The voltage coming straight off the battery is usually around 12 volts. Once the current has passed through the coil, it has been amplified to a magnitude that may exceed 30,000 volts. The ignition coil is, in essence, an electrical transformer. It works by receiving the low-voltage current that then passes through a tightly coiled winding of heavy-gauge wire (shown in cutaway, figure A). From there the current passes into a much denser winding of much finer wire. The process of passing from the larger electrical pathway into a much smaller one can be thought of analogous to water flowing from a large pipe that then funnels down to a narrower one. The output at the end of the smaller pipe is intensified by the pressure. The process is similar with electrical current, but the increase is in voltage -- or intensity of charge -- rather than physical pressure. The intensified current is carried from the coil via the coil wire to the distributor, which then directs the charge to each of the spark plugs in the proper sequenced and in precisely controlled time-intervals. Replacing a worn-out coil in an older vehicle is a simple process, since the part is easily accessible. It's held in place on the outside of the engine block by a simple bracket. Materials:
New ignition coil
Socket wrench
Screwdriver, flat
Nut driver
As with any automotive project that involves electrical parts or wiring, disconnect the vehicle's negative battery cable before you begin, to avoid injury or damage to the electrical system. - Loosen the retaining screws that secure the electrical contacts on top of the coil. With the screws loosened, unhook the contacts.
- Use a socket wrench to loosen the coil bracket, then remove the coil from its bracket.
- Place the new coil in the bracket.
- Connect the wire leading from the vehicle battery to the positive post of the coil. With the wire attached, tighten down the nut that holds it in place (figure B).
- The negative post on the coil (figure C) is where the wire attaches that leads to the distributor. Attach the lug-contact on the end of the distributor wire to the negative post and tighten down the retaining nut (figure D).
- Reconnect the negative battery cable and start the engine to make sure the system is working.
RESOURCES :
Auto Repair for Dummies
Author: Deanna Sclar
ISBN: 0764550896
Professional Tips and Techniques for Tune-Up and Electrical Service
Model: 1879110156
Author: Michael Bishop and Dennis Holmes
To order this title from Amazon.com, click here.
Do-It-Right Publishing
New Hall, CA 91322
Standard Guide to American Muscle Cars
Model: 0873412303
Author: John A. Gunnel, editor
(2001)
To order this title from Amazon.com, click here.
Krause Publications
Website: www.krause.com
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