Frequently Asked Questions About Mack RD Truck CAC Clamps, Boots & Hoses

What years and models of Mack RD trucks do these CAC components fit?

Our CAC clamps, boots, and hoses are designed to fit Mack RD600, RD688, and RD690 models from 1989 through 2007. However, compatibility can vary based on your specific engine configuration (E7, E-Tech, or MP series). We recommend checking your current part numbers or calling our support team with your VIN to ensure proper fitment, especially for trucks with aftermarket modifications or non-standard intercooler setups.

How do I know when my CAC boots and hoses need replacement?

Common signs include visible cracks, soft spots, or bulging in the rubber, oil residue around connection points, decreased engine performance, excessive black smoke, or whistling sounds under acceleration. During inspection, squeeze the boots firmly - if they feel mushy or don't spring back to shape, replacement is necessary. Most drivers report needing replacement every 3-5 years depending on operating conditions, with severe duty applications requiring more frequent changes.

What's the difference between standard and heavy-duty CAC clamps?

Standard T-bolt clamps work fine for most applications and cost less, but heavy-duty constant torque clamps maintain consistent pressure through temperature cycles and vibration, reducing the need for periodic retightening. For trucks running high boost pressure (over 35 PSI) or operating in extreme temperature conditions, we recommend constant torque clamps. They typically last 2-3 times longer and prevent the common issue of clamps loosening over time.

Can I install these CAC components myself, or do I need special tools?

Installation is straightforward and typically takes 1-2 hours with basic hand tools. You'll need a socket set (usually 10mm or 7/16"), flathead screwdriver for removing old clamps, and silicone spray lubricant for easier boot installation. The main challenge is accessing tight spaces near the firewall. Pro tip: warm the boots in hot water before installation to make them more pliable. Always replace clamps when changing boots - reusing old clamps is a common cause of boost leaks.

Why are silicone CAC hoses more expensive, and are they worth it?

Silicone hoses cost 2-3 times more than standard rubber but offer superior heat resistance (up to 500?F vs 250?F for rubber), better resistance to oil degradation, and typically last 5-7 years versus 2-3 years for rubber. They maintain flexibility in extreme cold and don't develop the hardening issues common with rubber hoses. For trucks running high EGTs, frequent idle time, or operating in extreme climates, the longer service life makes silicone a cost-effective upgrade.