How to repair a torn valve stem?

1. Use a file to remove the burrs from the valve stem strain; For areas with shallow strains, use a flat shovel to machine them to a depth of about 1mm, and then use sandpaper or angle grinder to roughen them. At this point, a new metal surface will appear.

2. Clean the surface with TL-700 metal cleaner to ensure that the repaired surface is free of oil, dust, and dirt.

3. Apply wear-resistant repair agent.

4. Detail finishing.

Preparation and application process of wear-resistant repair agent:

1. Prepare repair agent in a volume ratio of 3.8:1;

2. Apply the adhesive to the scratched surface, with the first coat applied as little as possible, from top to bottom, and no air bubbles are allowed;

3. After the first coat of adhesive is applied for 1 hour (i.e. after the adhesive has preliminarily cured), the repair agent should be re mixed according to the requirements and the second coat should be applied, with a height of 1-2mm higher than the original size;

4. After natural curing for 1 hour, heat with an iodine tungsten lamp at 80-100 ℃ for 3 hours.

Requirements for detailed finishing process:

1. Use tools such as files, scrapers, and sandpaper to remove adhesive that is higher than the original size. During the operation, measure it at any time and do not make the adhesive layer lower than the original size. Reserve 0.5mm as the finishing amount;

2. When the size reaches the precision level, use a pre processed grinding tool to adjust it (with an 80 mesh sandpaper pad);

When the size is 0.2mm higher than the original size, replace the diamond sand and grind it to the actual size accuracy.

Notes:

Due to on-site repair, in order to ensure the quality of the repair, it is necessary to clean up the dust, oil stains, etc. around the repair area (especially the upper part); If there are defects (such as small air holes, etc.) after repair, adhesive repair should be carried out, and the operation process is the same as above.