C4/C5 Chevrolet Corvette EMT “Runflat” Tire Servicing

1. Clean demount head. Replace with a new unit if dirt is embedded in demount head.

2. Clean rim. Note and record any damage to rim prior to servicing.

3. Remove the valve core. Remove the sensor
retainer nut (11mm). Drop sensor into the tire.

4. Clamp wheel. Verify rim is squarely clamped by checking rotational runout. If not square, briefly release and reclamp.

5. Lock upper roller. Push roller down ¼ inch below edge of rim to secure the rim while loosening lower bead.

6. Watch wheel underside in mirror.

7. Loosen and lubricate lower bead. Rotate counterclockwise. Loosen bead just enough to expose the safety hump.

8. Loosen upper bead. Retract lower roller prior to upper bead loosening. Loosen just enough to expose safety hump. Use special care on pre 1997 versions, because they are more susceptible to potential invasive damage.

9. Lubricate rim flange and tire.

10. Lubricate end of “HM” bead lever tool.

11. Place “HM” lever with sleeve protector between tire and rim. Retract upper roller.

12. Push demount head downward against rim. Adjust arm perpendicular to rim. Use the “Plus One” detent from the forward position.

13. Rotate tire counterclockwise to position “HM” lever onto demount head.

14. Rotate wheel counterclockwise while pulling tire onto demount head. Counterclockwise rotation rolls tire bead automatically into drop center and pulls demount head down against rim (eliminates bead depressors and excessive effort).

15. Push tire up with lower roller. Switch hands on “HM” lever. Position bead roller assembly. Set diameter to 1 inch larger than rim size before positioning. Lock column.

16. Grasp Tire and Rotate Clockwise To Demount Tire. Pulling tire along with wheel prevents lubricated rim from slipping inside stiff tire.

17. Pull tire straight up. Push tire forward to tilt away. Hold tire in drop center with thigh.

18. Lift lower bead onto demount head. HINT: Lubricate “HM” lever halfway up. Insert, lift, and briefly rotate counterclockwise increasing gap to ease removal.

19. Push “HM” lever through tire halfway. Pull upward on both ends and hold. Demount clockwise. HINT: Using sleeve protector eliminates need for pulling up in this manner.