ATD Tools Model 356 HNBR O-Ring Assortment User Manual
For R-12 and R-134a Automotive A/C Systems
1. Product Overview
The ATD Tools Model 356 is a 270-piece assortment of HNBR (Highly Saturated Nitrile Butyl Rubber) O-rings designed for use in automotive air conditioning systems. This kit provides a comprehensive selection of O-rings compatible with both R-12 and R-134a refrigerants, ensuring reliable sealing for various A/C components. The O-rings are organized in a durable plastic storage case for easy identification and access.
This image displays the ATD Tools Model 356 O-Ring Assortment, featuring 270 green HNBR O-rings organized by size within a transparent plastic storage case. Several O-rings are also shown outside the case, highlighting their distinct green color and various dimensions.
2. Preparation and Setup
Proper preparation is crucial for effective O-ring sealing and longevity.
- Inspect O-rings: Before installation, carefully inspect each O-ring for any visible defects such as cuts, nicks, or deformities. Discard any damaged O-rings.
- Clean Surfaces: Ensure that all mating surfaces where the O-ring will be seated are clean, dry, and free from debris, old gasket material, or corrosion. Use a suitable cleaner if necessary.
- Lubricate: Apply a thin, even coat of an appropriate O-ring lubricant (compatible with HNBR and your A/C system's refrigerant and oil) to the O-ring. This aids in installation, reduces friction, and helps prevent damage during assembly.
3. Operating Instructions (Installation)
Follow these steps for correct O-ring installation:
- Select Correct Size: Refer to your vehicle's service manual or the component specifications to determine the exact O-ring size required for the application. The assortment provides a variety of sizes to match common automotive A/C fittings.
- Position O-ring: Carefully place the lubricated O-ring into its groove. Ensure it is seated evenly and not twisted or stretched excessively.
- Assemble Components: Bring the mating components together smoothly, taking care not to pinch or roll the O-ring.
- Tighten Fasteners: Tighten fasteners to the manufacturer's specified torque settings. Overtightening can compress the O-ring beyond its elastic limit, leading to premature failure and leaks. Undertightening can result in insufficient sealing.
- Leak Test: After installation, perform a leak test on the A/C system using appropriate equipment to confirm the integrity of the new seals.
4. Maintenance and Storage
To ensure the longevity and effectiveness of your O-rings, proper maintenance and storage are essential.
- Storage: Store unused O-rings in their original plastic case, away from direct sunlight, extreme temperatures, and harsh chemicals. HNBR O-rings are UV resistant, but prolonged exposure can still degrade the material over time.
- Cleanliness: Keep the storage case clean and free from dirt or contaminants that could transfer to the O-rings.
- Handling: Handle O-rings with clean hands or gloves to avoid transferring oils or debris that could compromise their sealing ability.
5. Troubleshooting
If a leak occurs after O-ring installation, consider the following common issues and solutions:
- Incorrect Size: Ensure the O-ring used matches the exact specifications for the application. An O-ring that is too small will stretch and thin, while one that is too large may not seat properly or become pinched.
- Improper Installation: The O-ring may have been twisted, pinched, or rolled during assembly. Disassemble, inspect the O-ring for damage, and reinstall carefully.
- Damaged O-ring: Even new O-rings can sometimes have manufacturing defects or be damaged during handling. Re-inspect the O-ring for any nicks, cuts, or flat spots. Replace if damaged.
- Surface Imperfections: Check the mating surfaces for scratches, burrs, or corrosion that could prevent a proper seal. Address any surface issues before reinstallation.
- Overtightening: Excessive torque can deform the O-ring, leading to a leak. Always adhere to manufacturer torque specifications.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | ATD Tools |
| Model Number | 356 |
| Material | HNBR (Synthetic Rubber) |
| Compatibility | R-12 and R-134a Refrigerants |
| Total Pieces | 270 |
| Package Dimensions | 21.336 cm L x 10.16 cm W x 3.302 cm H |
| Item Weight | 4.8 ounces |
| Color | Green (with possible Black variant) |
Assortment Contents (Quantity and Size):
- 20 pieces: 7/32" x 1/16"
- 20 pieces: 1/4" x 1/16"
- 20 pieces: 6.8 x 1.9 mm
- 20 pieces: 5/16" x 1/16"
- 20 pieces: 7.8 x 1.9 mm
- 20 pieces: 8 x 2 mm
- 20 pieces: 8.8 x 1.9 mm
- 15 pieces: 7/16" x 1/16"
- 15 pieces: 7/16" x 3/32"
- 15 pieces: 11 x 2 mm
- 15 pieces: 12 x 2 mm
- 10 pieces: 13.9 x 1.8 mm
- 10 pieces: 9/16" x 3/32"
- 10 pieces: 14 x 2 mm
- 10 pieces: 15 x 2 mm
- 10 pieces: 17 x 2 mm
- 10 pieces: 11/16" x 1/16"
- 15 pieces: 11/16" x 1/8"
7. Warranty and Support
For information regarding product warranty, returns, or technical support, please contact ATD Tools directly through their official website or customer service channels. Keep your purchase receipt as proof of purchase.
Note: This manual provides general guidelines. Always refer to your vehicle's specific service manual for detailed repair procedures and torque specifications.
