When reinstalling the RPM sensor, turn the rpm sensor (Item 1) [Figure 70-91-1] in until it makes contact with the engine flywheel.
Turn the jam nut (Item 2) [Figure 70-91-1] until it contacts the flywheel housing. The jam nut should not be tightened, it needs to turn with the RPM sensor when the sensor is turned back out for adjustment.
Turn the RPM sensor and the jam nut out from the flywheel. Set a clearance of .050 inch (1,27 mm) between the jam nut and the housing with a feeler gauge (Item 1) [Figure 70-91-2].
NOTE: New RPM sensors have a plastic tip which is used as a gauge during installation. The feeler gauge method is not used. The plastic tip is designed to come off after the engine is started.