Adjusting your AC clutch can seem daunting, but with the right tools and a little patience, it’s a manageable DIY project. This guide walks through a recent AC clutch shim adjustment, offering practical tips and insights learned along the way. The focus here is on achieving the proper clearance using Ac Clutch Shims.
Understanding AC Clutch Shims and Their Role
The AC clutch engages and disengages the air conditioning compressor, allowing it to cycle on and off as needed. AC clutch shims are small metal discs that sit between the clutch plate and pulley. They control the air gap between these components. This gap is crucial for proper clutch engagement and disengagement. Too large a gap, and the clutch might not engage reliably. Too small, and it might not disengage fully, leading to premature wear and reduced AC efficiency. This “shimmy shuffle,” as some call it, requires careful measurement and adjustment.
Measuring and Adjusting the Gap with Shims
Before starting, access to the AC clutch is key. Jacking up the car and removing the wheel provides ample working space. Begin by measuring the existing gap between the clutch plate and pulley using feeler gauges. Aim for a measurement as accurate as possible. In this particular instance, the initial gap measured between .031 and .035 inches.
The target clearance for this specific vehicle was .012 inches. The existing shims (one thick, around .020-.021 inches, and one thin, approximately .004-.005 inches) totaled about .024-.026 inches. To achieve the target clearance, a reduction of .019-.020 inches in total shim thickness was required.
Removing the thick shim and using a single .007 inch shim from a Volvo shim kit proved to be the solution. While a micrometer would provide precise shim measurements, comparing shims to feeler gauges offered a reasonable approximation. Remember, precision is paramount when working with AC clutch shims.
Tools for the Job: Clutch Holder and Puller
Specific tools simplify the process. An AC clutch holder tool is essential for removing the bolt securing the clutch plate. While an improvised puller using a long bolt and washers might work, a dedicated AC clutch puller/installer toolset is recommended for efficient removal. This kit includes a remover plate and a specialized tool that fits inside the threaded area of the original bolt, ensuring smooth removal. Keep in mind that even with both tools, you’ll need three M5 bolts (approximately 30mm long) to secure the holder and remover plate. AutoZone’s loaner tool program offers a convenient way to access these specialized tools without a significant investment.
Final Adjustments and Verification
After installing the new shim and reassembling the clutch, re-measure the gap to ensure it falls within the desired range. In this case, the final gap measured around .012 inches with the feeler gauges held flat, slightly larger at an angle.
Finally, test the AC system. Engage and disengage the clutch multiple times to confirm proper operation. While initial testing showed positive results, further evaluation under hotter conditions is crucial to ensure long-term success. Continued monitoring will confirm the effectiveness of the shim adjustment.
Conclusion
Adjusting AC clutch shims is a task that requires attention to detail and the right tools. By understanding the function of AC clutch shims, accurately measuring the gap, and using the appropriate tools, you can successfully perform this adjustment and ensure optimal AC performance. Remember to verify the final gap and thoroughly test the system after completing the adjustment. This careful approach can prevent future issues and maintain a comfortable driving experience.
