WASHER-THRUST 3207318 - Caterpillar

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Ignition Pulses Relative To Crank Angle TC Signal (Six Cylinder Engine)
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Close up Of Ignition Pulses Relative To Crank Angle TC Signal (Six Cylinder Engine)Sent from MIB (pin-A, 10 pin Connector) to Timing Control (pin-C).From TC to TC, this waveform should show one pulse for each number cylinder. The pulse is normally at 5 V and goes below 2 V when the MIB detects the ignition firing.Interaction Of The Interface Signals
The manual override signal is held below one volt, the MIB is placed in "Mag Cal" Mode. The TCM generates the Clock signal by squaring the Speed Sensor (TCMPU) signal. This clock signal is used by the MIB electronics in order to keep track of the rotational position. When the the Reset pulse is received from the TCM, the MIB counts nine Clock signal edges. The MIB will then signal to fire Cylinder Number One. The MIB continues to monitor the Clock. The MIB signals to fire the remaining cylinders through the rotation. When the MIB discharges to fire the cylinder, an ignition pulse is generated. The Ignition Pulse signal is a reduced voltage signal of the odd number bank's capacitor voltage. Ignition Timing is calculated by comparing the timing offset between TC from the Crank Angle Sensor and the Ignition Pulse for Cylinder Number One.When the Manual Override signal goes above one volt, the MIB operates in Manual (Standard) Mode. The MIB will no longer control ignition firing. The MIB will generate an ignition pulse at the most advanced ignition timing. The Ignition Timing is calculated in the same manner as in Electronic Timing Mode.
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Interaction Of Reset, Clock, Ignition Pulse And TC SignalWhen the MIB receives the Reset Pulse, the MIB generates a ignition pulse after 9 Clock Signal edges (both rising and falling edges). The MIB generates the Ignition Pulse for Cylinder Number One. This should occur before the TC signal of the engine.Ignition Pulse Firings
From TC to TC, this waveform should show one pulse for each cylinder. The pulses should go from 190 V to ground when the cylinder is signaled to fire.Magneto Wiring Diagram
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G3612 Engine Magneto WiringFiring Order 1-12-9-8-11-2-3-10-7-6Pin Order A-M-L-K-I-H-F-E-D-C-B
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G3616 Engine Magneto WiringFiring Order 1-2-5-6-3-4-9-10-15-16-11-12-13-14-7-8Pin Order A-T-H-F-P-N-M-L-K-J-S-R-E-D-C-BMagneto
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Variable Timing Magneto (1) Magneto interface box. (2) Alternator section of magneto. (3) Electronic firing section of magneto. (4) Magneto input connector. (5) Magneto output connector.The magneto is made of two sections.
Permanent magnet alternator section
Breakerless electronic firing sectionThere are no brushes or distributor contacts.
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Cross Section Of Variable Timing Magneto (2) Alternator section of magneto. (4) Magneto input connector. (5) Magneto output connector. (6) Vent. (7) Speed reduction gears. (8) Pickup coil. (9) Drive tang. (10) Energy storage capacitor. (11) Rotating timer arm. (12) SCR solid state switch.The engine turns the drive tang (9) . The drive tang turns the alternator section of the magneto (2) , the speed reduction gears (7) and the rotating timer