76 4 DLT ENGINE ELECTRICALLYOPERATEDAUTOMATIC KSB: Refer Fig.160. (Wherever Fitted) Control device is ON. The pump has got an automatic KSB (cold start accelerator) operated by a 12V power supply. The control device (1) Contains a wax module which is connected to the KSB control lever (2) Through a cable (3) When the engine is running, the control device draws current from battery through the stop solenoid (4) The current drawn from the battery is used to heat the wax module and the expanded wax releases the KSB control lever (which is held against a torsion spring) towards the ‘ZERO’ position of the injection advance unit plunger through the connecting cable (3). In this position, the KSB control lever rests against a stop plate (5) Fitted with pump housing. When the current supply is cut OFF to the actuating unit, the wax solidifies and the KSB control lever is pulled back to the advanced position (max. 2.5 deg. cam angle). This ensures automatic timing advance during engine start. It is to be noted that during engine running the power supply to the KSB control device is on. Setting static timing on the engine fitted with KSB unit. After fitting the pump loose on the engine a 12V power supply to be connected to the KSB control device to ensure that the KSB control lever rests against the KSB stop plate. (This takes 3 to 4 minutes after giving supply.) This corresponds to the fully retarded position of the advance unit plunger. At this position, the specified lift of pumping plunger to be set at TDC of the engine and the pump is tightened. Temperature controlled idle speed increase (TLA): Above pump has also got the feature TLA. The TLA is likewise actuated by the control device (1) and is an advisable addition to the automatic KSB. For this purpose, the KSB control lever (2) is extended and a ball pin (6) is fitted. When the engine is started in cold, this ball pin presses against the speed control lever and lifts it off the idle stop screw (7). The idle speed is thus increased and engine warm up is improved. By the time the engine is warm, the KSB control lever is against the KSB stop plate. Consequently, the speed control lever also rests against the idle stop screw ensuring normal idling and the temperature controlled idle speed increase is no longer operative. Refer enclosure for description of various parts and the electrical circuit connected with the automatic KSB & TLA.
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