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- Shoulder and sidewall damages on radial truck tires require section repairs. Do not attempt to repair this kind of damage with nail hole repair units, plugs or patches.
- Begin by demounting the tire and locating the injury
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Step 2:
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- Remove any injuring object, and make a careful visual inspection to determine the size, angle and extent of the injury.
- Use a Rema Awl to probe for unseen internal damage
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Step 3:
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- Determine whether injury is within repairable limits, as specified by the tire manufacturer and/or industry standards.
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Step 4:
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Repair Unit Reference Chart:
Tread Area Injuries Only |
| INJURY SIZE |
1/4" |
5/16" |
3/8" |
1/2" |
5/8" |
7/8" |
1" |
| LIGHT TRUCK |
| MINICOMBI |
A6 |
B8 |
B10 |
n/a |
n/a |
n/a |
n/a |
| REMASTEM |
RS-6 |
RS-8 |
RS-10 |
RS-12 |
RS-17 |
RS-22 |
RS-25 |
| REPAIR UNIT |
UP-6 |
RAD-120 |
RAD-120 |
RAD-120 |
RAD-140 |
RAD-140 |
RAD-140 |
| MEDIUM / HEAVY TRUCK |
| MINICOMBI |
A6 |
B8 |
B10 |
n/a |
n/a |
n/a |
n/a |
| REMASTEM |
RS-6 |
RS-8 |
RS-10 |
RS-12 |
RS-17 |
RS-22 |
RS-25 |
| REPAIR UNIT |
UP-6 |
UP-8 |
RAD-120 |
RAD-140 |
RAD-140 |
RAD-142 |
RAD-142 |
| n/a = Not Applicable *Not Applicable to speed rated tires |
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Step 5:
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- Using a low speed Buffer, or a low speed electric drill and a carbide cutter, begin by removing all damaged rubber and steel cord in the injury area.
- Be sure to remove damaged rubber from both sides of the injury.
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Step 6:
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- Cutting carefully along the sides of the injury (with a Skiving Knife) will reveal any stray or broken cords that were not removed during the previous step.
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Step 7:
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- Use a side cutters, as necessary, to trim stray cords. Loose strands of wire must not extend into the injury area.
- If a section of cord has even a few broken strands, it should be removed completely.
- Trim cord ends back to the upper or lower limit of the prepared area, leaving only solid, undamaged rubber at the sides of the opening.
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Step 8:
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- Use a high speed buffer ( 6490, 68-601...and more ) with a Pencil Stone to polish the exposed cord ends.
- Take care not to scorch the rubber around the injury, and avoid damaging cords at the sides of the prepared area.
- Check again for stray wires or broken cords.
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Step 9:
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- Use a Rema Brass Cleaning Brush to clean away any rubber or steel dust let behind by the buffing process. Be sure to clean both the inside and outside of the injury.
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Step 10:
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Step 11:
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- Prepare the skived area so that in cross-section, it is somewhat bell-shaped, as shown.
- Round edges slightly for best adhesion of the repair rubber at the edge of the skive.
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Step 12:
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- Begin preparing the inside surface of the tire by spraying the area around the injury with Rema Pre-Buff Cleaner.
- Make sure that the surface is thoroughly wet, and that the spray covers an area an out twice as large as the repair unit you will use.
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Step 13:
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- Allow the spray to stand for a few seconds, but do not allow it to completely evaporate.
- While the sprayed area is still wet with Pre-Buff Cleaner, use a Rema Scraper to remove mold release compounds, mounting lubricants, dirt and other innerliner contaminants.
- Be sure to scrape the entire area completely.
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Step 14:
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- Use the low speed buffer and buffing wheel to buff an area about 1" larger than the injury, all the way around it.
- Buff just until the surface has smooth, velvety, uniform texture to provide good adhesion for the repair rubber, but avoid overbuffing or gouging.
- As on the other side, round over the edges of the prepared area.
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Step 15:
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- Measure the thickness of the sidewall at the injury location, and note this measurement for later reference.
- Using a Crayon, write the thickness of the sidewall (in 32nds of an inch) near the repair area.
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Step 16:
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- Measure and record the dimension of the repair area.
- The measurement in the same direction that the body cords run is called thee"Radial" (orrR) dimension in this photo, the R dimension is 1-3/4".
- The measurement at right angles to the body ply cords is called thee"Axial" (or A) dimension. In this photo, the A dimension is 3/4".
- Use a Crayon to record both the R and the A dimension near the prepared area.
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Step 17:
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Step 18:
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- Repeat the process on the outside of the tire.. Be sure to coat all the surfaces that were buffed earlier.
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Step 19:
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- Secure a Rema Contour Plate firmly in place on the inside of the tire.
- Working from the center of the prepared area outward, fill the injury with extruded rubber (Extruder tool).
- Avoid creating any gaps, voids or air pockets as you fill the area.
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Step 20:
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- The extruded rubber should completely fill the injury area, and be about 1/8" higher than the tire surface around it.
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Step 21:
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- Working from the center outward, vigorously stitch the excluded rubber into place to drive out air pockets and to help fill the injury completely. (Tire Stitcher)
- Be sure to stitch rubber over the edges of the prepared area as well.
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Step 22:
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- Remove the backing plate, and repeat the stitching process on the inside of the tire.
- Once again, be sure to stitch rubber over the edges of the prepared area.
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Step 23:
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- Apply a sheet of Rema Anti-Stick material to the inside of the tire.
- Be sure to cover the entire stitched area, leaving at least 1/2" of overlap around the edges of the injury.
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Step 24:
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- Apply another sheet of Rema Anti-Stick material over the stitched rubber on the outside of the tire, again allowing about 1/2" of overlap around all sides of the area.
- Place the tire in a properly preheated vulcanizing unit.
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Step 25:
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- Oriented the heating pads to completely cover the injury in both directions and to provide even pressure during curing.
- Center a Rema Contour Plate and Pressure Equalization Cushion over the repair area on the outside of the tire.
- No special treatment is required on the inside of the tire.
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Step 26:
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- With a spot vulcanizer, make sure that the heating pads are aligned with each other, then use the ratcheting lever to gently apply pressure to the repair area.
- Make sure the heating pads, Contour Plate and Pressure Equalization Cushion are properly aligned and will not shift during the vulcanizing process.
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Step 27:
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- Apply pressure until the indicator is nearly touching the bottom of the groove.
- On vulcanizer apply pressure until the compression washers are completely flattened.
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Step 28:
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Set the timer for 5 minutes of cure time for every 1/32nd of injury thickness. For example, an injury through 5/16" of rubber thickness will require:
5/16" = 10/32" 10 x 5 min. = 50 min. curing time.
|
| mm |
inch |
32nds |
Cure Time (minutes) |
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mm |
inch |
32nds |
Cure Time (minutes) |
| 0 |
1/32 |
1 |
5 |
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13 |
17/32 |
17 |
85 |
| 1 |
1/16 |
2 |
10 |
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14 |
9/16 |
18 |
90 |
| 2 |
3/32 |
3 |
15 |
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15 |
19/32 |
19 |
95 |
| 3 |
1/8 |
4 |
20 |
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15 |
5/8 |
20 |
100 |
| 3 |
5/32 |
5 |
25 |
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16 |
21/32 |
21 |
105 |
| 4 |
3/16 |
6 |
30 |
|
17 |
11/16 |
22 |
110 |
| 5 |
7/32 |
7 |
35 |
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18 |
23/32 |
23 |
115 |
| 6 |
1/4 |
8 |
40 |
|
19 |
3/4 |
24 |
120 |
| 7 |
9/32 |
9 |
45 |
|
19 |
25/32 |
25 |
125 |
| 7 |
5/16 |
10 |
50 |
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20 |
13/16 |
26 |
130 |
| 8 |
11/32 |
11 |
55 |
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21 |
27/32 |
27 |
135 |
| 9 |
3/8 |
12 |
60 |
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22 |
7/8 |
28 |
140 |
| 10 |
13/32 |
13 |
65 |
|
23 |
29/32 |
29 |
145 |
| 11 |
7/16 |
14 |
70 |
|
23 |
15/16 |
30 |
150 |
| 11 |
15/32 |
15 |
75 |
|
24 |
31/32 |
31 |
155 |
| 12 |
1/2 |
16 |
80 |
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25 |
1 |
32 |
160 |
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Step 29:
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- At the end of the cure time, you may remove the tire from the curing press, but do not remove the Rema Anti-Stick material.
- Allow the tire to cool to room temperature, then remove the anti-stick material. The repaired area should look smooth and completely filled.
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Step 30:
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- Select the correct size RAD (or UP) repair unit, based on the size of the injury.
- If either dimension falls between entries, select the next larger unit, indicated by a higher number.
- Note: Shoulder injuries may require a different choice of repair unit.
- Never undersize the repair unit.
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Step 31:
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- Spray the repair area with Rema Pre-Buff Cleaner until the surface is thoroughly wet.
- After a few seconds, while the sprayed area is still wet, use a Rema Scraper to re-clean the repair area.
- Be sure to scrape an area larger than the chosen repair unit. Make sure to clean the area completely.
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Step 32:
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- Determine the area to be buffed, and mark it with an outline approximately 1/2" larger than the repair unit to be used.
- Hash marks at the center of each side of the repair unit, and at the center of each side of the outline ill help you position the repair later.
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Step 33:
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- Use a low speed buffer and an appropriate buffing wheel to buff the area marked in the previous step.
- Work from the center to the outside, and buff just until the surface has a smooth, velvety, uniform texture.
- Avoid overbuffing or gouging.
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Step 34:
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- Use a Rema Brass Cleaning Brush to clean away any rubber dust left behind by the buffing process.
- Thoroughly vacuum to remove all debris.
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Step 35:
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- Using a brush applicator top from a can of Rema Special Cement BL, apply cement to the entire buffed area on the inside of the marks made earlier.
- Spread cement evenly and thoroughly, then allow it to dry naturally (Do Not use blow driers, heat lamps or compressed air) until it is slightly tacky.
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Step 36:
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- If you have been using a bead spreader, be sure to relax the beads before applying the repair unit.
- Bend the repair unit, as shown, to split the pre-scored backing.
- Peeling back and fold over only about 1" of backing on both sides of the split area. Do not remove all of the backing at this stage.
- Take care not to touch the exposed portion of the repair unit, as dirt or oil from your fingers can contaminate the bonding layer.
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Step 37:
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- Center he repair unit over the prepared area, making sure that the bead indicator arrows are pointing towards the beads.
- Use the hash marks previously made on the repair unit and the tire to help align the RAD unit properly.
- Press the center of the unit into place, so that it adheres firmly.
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Step 38:
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- Use a stitcher to begin stitching the repair unit to the prepared area.
- Stitch from the center outward, to force out any trapped air and to secure the unit firmly.
- Once the center of the repair unit is secured, peel off the remaining protective backing, and continue stitching until the entire repair unit is completely stitched into place.
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Step 39:
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- After you have finished stitching the center, be sure to stitch all the way around the edge of the repair unit.
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Step 40:
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- After stitching, apply a generous coating of Rema Repair Sealant to the edge of the RAD repair unit and to the buffed area around it, to provide a complete seal around the repair unit and tire and to steal the innerliner.
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Step 41:
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- Using the low speed buffer and buffing wheel, lightly is flush with the surrounding area, presenting a smooth finished appearance.
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Step 42:
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- Be sure to apply Rema Section Repair ID Patches to indicate the location of the section repair.
- Note that when the tire is inflated to its recommended working pressure for the load, any bulge in the section repair area must not exceeded 3/8".
- If the injury exceeded 3/8" or required a reinforced repair unit, allow tire to stand 24 hours. Otherwise, tire may be returned to service.
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This tutorial was brought to you by Rema Tip Top (Rematiptop.com)
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