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

What size CAC boots and clamps do I need for my Kenworth K100 or K123?

Most Kenworth cabovers use 3-inch to 4-inch diameter CAC boots, but the exact size depends on your engine model and turbo setup. For K100s with Caterpillar engines, you'll typically need 3.5-inch boots. Cummins-powered models often require 4-inch boots. Always measure your existing boots or check the inlet/outlet diameter of your charge air cooler and turbo connections before ordering. We recommend using T-bolt clamps rated for at least 150 PSI for secure connections.

Are silicone CAC hoses worth the extra cost compared to rubber ones?

Yes, silicone CAC hoses offer significant advantages for Kenworth cabovers. They withstand temperatures up to 500?F compared to rubber's 250?F limit, resist oil and fuel contamination better, and typically last 3-4 times longer. Silicone hoses also maintain flexibility in extreme cold and won't collapse under high boost pressure. While rubber hoses cost 40-60% less initially, you'll likely replace them 2-3 times before a silicone hose needs replacement.

How do I stop my CAC boots from blowing off under heavy loads?

Boot blow-offs usually result from using inadequate clamps or worn boot lips. Replace standard worm-gear clamps with heavy-duty T-bolt clamps that provide 360-degree clamping force. Ensure your CAC pipes are clean and free of oil residue before installation. Apply a thin layer of silicone spray (not grease) to help boots seat properly. Check that your boost pressure isn't exceeding your engine's specifications, as excessive boost will overcome even the best clamps.

What's the difference between standard and reinforced CAC hoses for my cabover?

Reinforced CAC hoses feature internal wire or polyester cord reinforcement that prevents collapse under vacuum conditions and provides better resistance to ballooning under boost. Standard hoses work fine for stock boost levels (typically under 25 PSI), but if you're running higher boost or hauling heavy loads regularly, reinforced hoses are essential. They cost about 20-30% more but prevent costly roadside failures and downtime.

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

Most CAC boot and hose replacements can be done with basic hand tools. You'll need a socket set for T-bolt clamps, a flathead screwdriver for worm clamps, and possibly a heat gun to soften tight-fitting boots. The main challenge with Kenworth cabovers is access - you'll often need to tilt the cab for easier reach. Allow 1-2 hours for a complete hose replacement. Having a second person helps when aligning larger boots. Always let the engine cool completely before starting work.