Frequently Asked Questions About International LT CAC Clamps, Boots & Hoses

What are the correct clamp sizes for my International LT's charge air cooler system?

International LT models typically use 3-inch to 4-inch clamps for CAC connections, but the exact size depends on your specific engine configuration. Most 2017-2024 LT models with Cummins X15 engines require 4-inch clamps at the turbo outlet and CAC inlet. For N13 engines, you'll need 3.5-inch clamps. Always measure your existing hose diameter before ordering, as some aftermarket modifications may require different sizes.

How often should I replace CAC boots and hoses on my International LT?

Under normal operating conditions, CAC boots and hoses should be inspected every 100,000 miles and typically last 200,000-300,000 miles. However, frequent boost pressure issues, oil contamination, or extreme temperature operations can significantly reduce lifespan. Look for signs of cracking, bulging, or soft spots during pre-trip inspections. If you're experiencing boost leaks or reduced power, inspect these components immediately.

Are silicone or rubber CAC boots better for my International LT?

Silicone boots offer superior heat resistance (up to 500?F) and last 2-3 times longer than standard rubber boots, making them ideal for heavy-haul applications or frequent mountain driving. Rubber boots are more economical and work well for standard highway use. Silicone is recommended if you've experienced repeated boot failures or operate in extreme temperatures. Both materials are compatible with International LT systems when properly sized.

What torque specifications should I use when installing CAC clamps?

For T-bolt style clamps on International LT CAC systems, torque to 75-90 inch-pounds for 3-inch clamps and 90-105 inch-pounds for 4-inch clamps. Over-tightening can damage boots and cause premature failure. Use a calibrated inch-pound torque wrench and tighten in a cross-pattern for even pressure distribution. Spring-loaded constant torque clamps self-adjust and don't require specific torque values.

Why do my CAC boots keep blowing off even with new clamps?

Boot blow-offs typically indicate underlying issues beyond worn clamps. Check for excessive boost pressure (above 35-40 PSI), misaligned pipes causing angular stress, or degraded boot material that won't seal properly. Ensure mating surfaces are clean and free of oil residue. Consider upgrading to constant torque clamps or adding a bead roll to smooth pipe connections. If problems persist, have your turbo and boost control system inspected.