Device Features
The system includes sources of electrical energy, a sensor-distributor. high energy ignition coil, switch, spark plugs, wires and ignition switch. The firing order is 1-3-4-2.
Bosch or Lucas margin gauge (pic. 7.38) four-spark, unshielded. with vacuum and centrifugal ignition timing controllers, with a built-in microelectronic control impulse sensor.
Pic. 7.38. Distribution sensor for JPA, LPA and LUA engines.
A - Bosch brands; B - Lucas.
1 - distributor assembly; 2 - fastening bolt; 3 - drive clutch; 4 - pin; 5 and 9 - gaskets; 6 - rotor; 7 - distributor cap; 8 - switch; 10 - vacuum regulator; 11 - roller with the leading plate of the centrifugal regulator; 12 - rotor; 13 - generator sensor.
Centrifugal and vacuum regulators automatically change the ignition timing depending on the crankshaft speed and engine load (pic. 7.39-7.44).
Pic. 7.39. Characteristics of the automatic ignition advance of the Lucas distributor mounted on JPA engines.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator.
When checking on the stand, reduce the values \u200b\u200bindicated on the graph by half. When checking on a car, add the value of the initial ignition timing to the indicated values.
Pic. 7.40. Characteristics of the automatic ignition timing of the Bosch distributor sensor installed on JPA engines.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator.
When checking on the stand, reduce the values \u200b\u200bindicated on the graph by half. When checking on a car, add the value of the initial ignition timing to the indicated values.
Pic. 7.41. Characteristics of the automatic ignition advance of the Lucas distributor mounted on LPA engines.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator.
When checking on the stand, reduce the values \u200b\u200bindicated on the graph by half. When checking on a car, add the value of the initial ignition timing to the indicated values.
Pic. 7.42. Characteristics of the automatic ignition advance of the Lucas distributor mounted on JPA engines.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator.
When checking on the stand, reduce the values \u200b\u200bindicated on the graph by half. When checking on a car, add the value of the initial ignition timing to the indicated values
Pic. 7.43. Characteristics of the automatic ignition advance of the Lucas sensor-distributor installed on the engines of the LUA model.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator.
When checking on the stand, reduce the values \u200b\u200bindicated on the graph by half. When checking on a car, add the value of the initial ignition timing to the indicated values.
Pic. 7.44. Characteristics of the automatic ignition timing of the Bosch distributor sensor installed on the LUA model engines.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator.
When checking on the stand, reduce the values \u200b\u200bindicated on the graph by half. When checking on a car, add the value of the initial ignition timing to the indicated values.
Vehicle ignition system «Escort XR3i» has a switch built into the rotor of the sensor-distributor and automatically turns off the ignition when the crankshaft speed reaches 6500 rpm.
Ignition coil
Bosch ignition coil (catalog number 0 221 122 030) or Lucas has a primary winding resistance of 0.72-0.88 ohms, a secondary winding resistance of 4.5-7.0 kOhm. The voltage of the secondary winding is not less than 30,000 V.
Switch
Switch (pic. 7.45) converts the current pulses of the sensor into current pulses in the primary winding of the ignition coil. The commutator is fixed on the body of the sensor-distributor (pic. 7.46).
Pic. 7.45. Ignition switch.
1 - body; 2 - output «-» low voltage from the coil; 3 - output «+» low voltage to the coil; 4 - conclusions of the connection with the sensor of control pulses; 5 - connector.
Pic. 7.46. The arrows indicate the fastening of the nameplate of the sensor-distributor and the switch.
Spark plug
Motorcraft Super spark plugs. The gap between the electrodes is 0.75 mm for the spark plugs of the LRA engine ignition system, for the rest of the spark plugs - 0.6 mm. Candle types are shown in Table 7.13.
Vacuum Regulator Control Device
The control device for the vacuum regulator of the non-contact ignition system of the LUA engine, in addition to delaying the change in vacuum, increases the vacuum value thanks to a special valve. Delay time to create a vacuum of 200 mm. R. st from 8 to 16 sec. delay valve catalog number D 5 VE - 12 A 208-AA - AB, valve color - green-white.
On cars «Escort» And «Orion» with automatic gearbox, the vacuum regulator has one diaphragm, working to reduce the ignition timing, and one diaphragm, working to increase this angle (pic. 7.47), and the control device for the vacuum regulator is different from the device installed on vehicles with a manual gearbox.
Pic. 7.47. The control device for the vacuum regulator of the ignition system on vehicles with automatic gearbox.
1 - fuel accumulator; 2 - electromagnetic two-way valve; 3 - blue thermostatic valve; 4 - green thermostatic valve; 5 - tees; 6 - return valve; 7 - calibrated section; 8 - vacuum regulator with two diaphragms; 9 - branch pipe on the inlet pipeline.
Therefore, the characteristics of the automatic ignition advance differ from the characteristics of other distributor sensors (pic. 7.48).
Pic. 7.48. Characteristics of the automatic ignition timing of the sensor-distributor installed on vehicles with automatic gearbox.
A - characteristic of the centrifugal regulator; B - characteristic of the vacuum regulator in the case of an increase in V03; B - characteristic of the centrifugal regulator in the case of a decrease in the UOP.
The applied sensor-distributor brand Bosch type 81 SF-1210 - ANA, blue-brown.
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