Frequently Asked Questions About Kenworth T700 CAC Clamps, Boots & Hoses

What are the signs that my CAC boots need replacement on my Kenworth T700?

Look for visible cracks, tears, or soft spots in the rubber boots. Common symptoms of failing CAC boots include loss of boost pressure, increased turbo lag, black smoke from the exhaust, and a noticeable decrease in fuel economy. You may also hear a hissing sound under acceleration. If your boost gauge shows lower than normal readings or fluctuates erratically, inspect your CAC boots immediately.

Will these CAC components fit both my 2008-2016 Kenworth T700 with ISX or Paccar engines?

Most CAC boots and hoses are engine-specific rather than model year specific. ISX engines typically use different boot sizes and configurations than Paccar MX engines. Always verify the part number against your engine model. ISX engines commonly use 4-inch to 5-inch boots, while Paccar MX engines may use different diameters. Check your existing boot markings or measure the outer diameter of your CAC pipes before ordering.

Do I need special tools to install CAC clamps and boots, and how long does installation typically take?

Basic hand tools are sufficient for most installations - you'll need screwdrivers or a socket set for clamps, and possibly pliers for removal. Some mechanics use a small amount of dish soap or silicone spray as a lubricant for easier boot installation. Never use petroleum-based products. A complete CAC boot replacement typically takes 30-60 minutes depending on accessibility. The lower boots are usually more challenging due to limited space.

What's the difference between standard rubber and silicone CAC boots, and which should I choose?

Standard rubber boots are OEM-equivalent and cost less, typically lasting 150,000-200,000 miles under normal conditions. Silicone boots cost more but offer superior heat resistance (up to 500?F vs 300?F for rubber), better flexibility in cold weather, and can last 300,000+ miles. Silicone is recommended for trucks running higher boost pressures, in extreme climates, or for drivers wanting maximum longevity.

How tight should CAC clamps be, and should I use constant torque or standard clamps?

Constant torque clamps are highly recommended for CAC applications as they maintain consistent pressure through temperature cycles, preventing boost leaks. Tighten clamps until snug plus an additional 1/4 turn - over-tightening can damage boots. The clamp should compress the boot evenly without cutting into it. For standard worm-gear clamps, re-torque after the first 500 miles as boots may compress slightly after initial heat cycles.