Repair steps for valve stem strain
①Use a file to remove the burr from the valve stem. At the shallow part, use a flat shovel to a depth of about 1mm, and then use a sand cloth or an angle grinder to roughen it. A new metal surface will appear at this time. .
②Clean the surface with TL-700 metal cleaner to make the repaired surface free of oil, dust and dirt.
③Apply wear-resistant repair agent.
④Detail trimming.
Preparation and coating process of wear-resistant repair agent
①According to the volume ratio of 3.8: 1 to prepare repair agent;
②Scrape the adhesive on the scratched surface, the first pass should be applied as little as possible, from top to bottom, no bubbles are allowed;
③After 1h of the first pass of adhesive (that is, after the initial curing of the adhesive), reconstitute the repair agent as required and apply the second pass, which is 1 ~ 2mm higher than the original size;
④After natural curing for 1h, it can be heated with 80 ~ 100 ℃ iodine tungsten lamp for 3h.
Detail trimming process requirements
①Use a file, scraper, emery cloth and other tools to remove the adhesive that is higher than the original size. Measure at any time during operation. Do not make the adhesive layer lower than the original size, and reserve 0.5mm as the finishing amount;
②When the size reaches the finishing amount, use the pre-processed grinding tires for finishing (80-mesh emery cloth);
③When the size is higher than the original size 0.2mm, replace the emery and grind to the actual size accuracy.
Precautions:
Due to the on-site repair, in order to ensure the repair quality, the dust and oil stains around the repair (especially the upper part) must be cleaned up; after the repair, if there are defects (such as small pores, etc.), the glue should be repaired.
