1. Buff or roughen the tube surface to be patchedfor at least 1 inch around the hole. Then clean it withsolvent. When a buffer is not available, use theperforated cover of the kit as a scraper.2. Apply a thin coat of rubber patching cementevenly over the roughened surface and allow it to dry.3. From the kit, choose a patch of the proper sizethat is about 3/4 inch larger than the hole in the tube fromthe kit. Remove the protective covering from the stickyside of the patch; place the patch over the hole, and rubit down firmly.4. Inflate the tube with enough air to check forleaks. If you cannot hear or feel air escaping from thepatch, you can make another check by inserting thepatched area in water. If no escaping air bubbles arenoticed, the tube may be dried and replaced in the tireor stored.tube, the burning material is ignited, allowed to burn,and then removed after cooling for at least 5 minutes.After this, examine the completed patch to see if theedges of the patching material are attached securely tothe tube. Then install the valve core and test the tube.Hot patches of assorted sizes are supplied in kits similarto the cold patch kits. You will also find pressure clampsand roughening tools in the hot patch kits.TIRE ROTATIONRotating tires or changing them from one wheel toanother so they wear evenly is recommended by themanufacturer. Tire rotation is performed to themanufacturer’s specification for each vehicle.Examples of tire rotations are shown in figure 3-37.TIRE SAFETYHot PatchesHot patches consist of a slow burning block of fuelheld in a notched metal pan on the bottom of which is apatch of uncured rubber. To apply a hot patch, followthe manufacturer’s instructions on the kit.Although methods of applying patches vary withthe clamping devices provided and the shape of thepatch, you clean and roughen the tube just as you did inapplying the cold patch. When the patching unit isplaced in the notches of the patch and clamped to theThe tire shop in most commands is supervised bythe maintenance supervisor. When you are assigned tothe tire shop, the maintenance supervisor should ensureyou are briefed on tire safety by either the shopsupervisor, the tire shop foreman, or the crew leader.People inexperienced in tire repair should onlyrepair tires when under the direct supervision of anexperienced person. Additionally, always refer to theappropriate manufacturer’s manuals for directions andinstructions and remember: SAFETY COMES FIRST.Figure 3-37.-Tire and wheel rotation.3-20
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