GAC QST30 Conversion — Installing Magnetic Speed Pickup

For the GAC QST30 Conversion.

Applies to: GAC QST30 Conversion

Procedure

1. Ensure the engine is not running and the ignition is in the OFF position.
2. If no mounting location is pre-drilled, drill and tap a threaded hole in the flywheel housing perpendicular to the center line of the crankshaft and centered over the ring gear teeth. Spot face the hole to provide a flat surface on which to anchor the locknut.
3. Insert the magnetic speed pickup into the hole and turn it until the magnetic speed pickup makes contact with the crown of a gear tooth.
4. Back out the magnetic pickup by turning it counter clockwise, about 1/4 turn.
5. The gap between the pickup and gear should be between 0.025 in (0.64 mm) and 0.035 in (0.89 mm). Wire leads should be twisted for their entire length from the magnetic speed sensor to the control unit. Shielding is required if external interference is present or the leads are longer than 10 ft (3 m).
6. Use an AC voltage meter to verify proper magnetic pickup installation. During cranking, sensor output should be 1.5 V AC minimum.

Source: manual:175 Series QST30-Conversion-Solution-A5-1.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.