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BF1 Digityre Lite Sensor Fitting

Mounting TPMS sensors looks straightforward enough but care must be taken to get the sequence and torque values correct in order for leak free service.
 
In this months tech primer, we're going to look at how to correctly fit and remove Bf1 Digityre Lite sensors.
 
 

1 - Check Sensor Clearance

1. Hold sensor up to wheel where the valve hole is and check to see if it protrudes above the lineof the tyre bead.

2. If the sensor is too high, the lower pads can be filed back for extra clearance.

 

2 - Tools Required

1. Torque screwdriver RS Part No 547-379 or torque wrench Wurth 07147120 (Set to 5.5Nm & 4.5Nm)
2. Hex to ¼” Adaptor
3. 11mm Socket with ¼” drive
4. Male to Female Hex Extension
5. Size 20 Torx Bit

 

3 - Valve Kit Parts (F1-02-0185-A)

A. Valve Caps
B. Nut
C. Washer
D. Stem (Valve core and high temperature ASC seal fitted)
E. Torx Screw
F. Reinforcement Plate
G. Torque Bar

 

 

4 Installation

1. Remove the existing valve from the rim (if fitted).
 
2. Check that there are no sharp edges on the valve hole, and that the spot face is clean.
 
 
3. Insert the valve stem through the rim; make sure that the small hole in the valve stem is at right angles to the rim, and facing upwards.
 
4. Place the plain washer over the valve stem.
 
5. Tighten the nut onto the valve stem using the Torque Driver and a 11mm socket; use the small bar to stop the valve rotating.
 
6. Tighten the nut until the torque driver breaks free (5.5Nm, THIS TORQUE MUST NOT BE EXCEEDED). The valve should now not be able to rotate.
 

 

7. Mount the sensor housing onto the back of the valve using the Torx bolt and reinforcement plate. Make sure that both of the sensor feet are in contact with the rim.

 

 

8. Using the Torque screwdriver tighten the Torx bolt until the screwdriver breaks free (4.5Nm) Use the small bar tovensure that the valve is not rotated during the tightening process. If the valve rotates the valve nut MUST be retorqued.
Remove the small bar

 

 

5 Notes

DO NOT ROTATE THE VALVE BODY, OR TWIST THE SENSOR ONCE THE VALVE ASSEMBLY HAS BEEN

INSTALLED, THIS WILL CAUSE THE VALVE TO LOOSEN AND THE VALVE NUT WILL THEN REQUIRE RETORQUING.THE TORQUE SETTING FOR THE TORX BOLT IS DESIGNED TO SLIGHTLY DEFORM THE SENSOR’S PEEK HOUSING, TO ENSURE THAT IT IS FITTED WITH MAXIMUM SECURITY.
THEREFORE, THE SENSORS ARE NOT DESIGNED TO BE REPEATEDLY REMOVED FROM THE WHEEL; THEY
SHOULD BE FITTED TO RIMS AND LEFT IN SITU FOR AS LONG AS POSSIBLE – i.e. THE LIFE OF THE
RIM/SENSOR. PLEASE DO NOT REMOVE SENSORS UNECESSARILY.

IF A SENSOR IS REMOVED FROM A RIM IT IS ESSENTIAL THAT IT IS FITTED TO THE SAME TYPE RIM AS
BEFORE, I.E. DO NOT INTERCHANGE FRONT SENSORS WITH REAR SENSORS.
NEW TORX BOLTS ARE PRE-IMPREGNATED WITH LOCTITE: IF A BOLT IS RE-USED THEN IT IS ESSENTIAL
THAT THE BOLT IS CLEANED AND LOCTITE 263 IS APPLIED PRIOR TO INSTALLATION.

 

6 Valve and Sensor Removal

1. Set the torque screwdriver to 6Nm. Place the torque bar in the hole on the valve dome, and hold it firmly.

Unscrew the TPMS bolt. When the thread has disengaged remove the sensor.

 

 

2. Fit the 11mm socket to the torque driver. Place the torque bar in the hole on the valve dome, and hold it
firmly. Unscrew the valve nut. When the thread has disengaged remove the nut, washer and valve. Please
note that the TPMS bolt cannot be reused. The valve, nut, washer and sensor can all be reused, providing
the sensor housing is unmarked.