Magazine for the professional tire industry
Issue link: https://mtd.epubxp.com/i/449261
MTD January 2015 TPMS not substitute a valve stem made of a diferent material, as the diferent metals will cause corrosion. CAUTION: Any time a sensor is to be installed in a wheel, a new seal and washer must be installed on the stem to ensure an air-tight sealing (see Figure 1). CAUTION: Do not reuse the sensor-to-wheel grommet. Always use a new grommet when installing a pressure sensor and properly torque the sensor nut. Removal 1) Remove the tire and wheel assembly from the vehicle. 2) Demount the tire from the wheel following tire changer manufacturer's instructions while paying special atention to the following to avoid damaging the pressure sensor: • When breaking the tire bead loose from the wheel rim, avoid using the bead breaker in the area of the sensor. Tat includes both front and rear beads of the tire (see Figure 3). • When preparing to demount the tire from the wheel, carefully insert the mounting/demounting tool at the valve stem +/- 10 degrees, then proceed to demount the tire from the wheel. Use this process on both the upper and lower tire beads. 3) Using a thin-walled socket, remove the special nut retaining the sensor to wheel. While removing the nut, hold pressure against the rear of the metal valve stem to keep the valve stem from pushing rearward, which could damage the antenna strap (see Figure 2). 4) Remove the sensor from the wheel (see Figure 4). Installation NOTE: Before reinstalling an existing tire pressure sensor, replace the seal and metal washer at the base of the valve stem to ensure proper sealing (see Figure 1). 1) Wipe the area clean around the sensor/valve stem mounting hole in the wheel. Make sure the surface of the wheel is not damaged. CAUTION: To avoid damaging the sensor antenna strap, hold pressure against the rear of the metal valve stem while the sensor is inserted through the wheel mounting hole and the nut is installed (see Figures 2 and 4). 2) Insert the sensor through the wheel as shown keeping pressure against the rear of the metal valve stem. Te poted side of the sensor is to be positioned toward the wheel. Do not atempt to mount the sensor otherwise, or damage may occur. Install the sensor nut (with the pressed-in washer) by hand (see Figures 4 and 5). NOTE: Before tightening the sensor nut, push downward on the sensor housing in an atempt to make it fush with the interior contour of the wheel. 3) Using a thin-walled socket, install the sensor nut. W hile holding the sensor in position, tighten the sensor nut to 58 in.-lbs. (6.5 N.m) CAUTION: Over-torquing the sensor nut by as litle as 106 in.-lbs. (12 N.m) may result in sensor separation from the valve stem. Under this condition, the sensor may still function; how- ever, the condition should be corrected immediately. Figure 4: Removing and installing the tire pressure sensor. Figure 5: Installing the tire pressure sensor. Quik-Link: 800-687-1557 ext. 11133 Sensor Wheel Nut Tire pressure sensor Wheel interior 74