Frequently Asked Questions About Peterbilt 330/335/337 CAC Clamps, Boots & Hoses

Will these CAC boots and hoses fit my specific year model Peterbilt 330, 335, or 337?

Most CAC (Charge Air Cooler) components for these models are compatible across 2005-2015 production years, but there are variations based on engine type. Caterpillar C7 engines typically use 3-inch diameter hoses, while Cummins ISB and ISC engines often require 3.5-inch or 4-inch connections. Always verify your engine model and existing hose diameter before ordering. Check the cold side (driver side) and hot side (passenger side) measurements separately, as they may differ.

How long do silicone CAC boots typically last compared to rubber ones?

Silicone CAC boots generally last 3-5 times longer than standard rubber boots under normal operating conditions. Silicone can withstand temperatures up to 500?F and resists oil degradation better than rubber. While rubber boots may need replacement every 2-3 years in heavy-duty applications, quality silicone boots often last 6-10 years. The higher upfront cost of silicone is typically offset by reduced replacement frequency and less downtime.

What torque specifications should I use for CAC clamps, and do I need special tools?

Standard T-bolt clamps should be torqued to 40-45 inch-pounds for 3-inch diameter connections and 50-60 inch-pounds for 4-inch connections. Over-tightening can damage boots and cause premature failure. A standard 5/16" or 8mm socket works for most T-bolt clamps. Spring-loaded constant torque clamps are recommended for fluctuating temperature conditions as they maintain consistent pressure automatically without retorquing.

Why am I losing boost pressure even with new CAC boots and clamps?

Boost leaks can occur at connection points if surfaces aren't properly cleaned or aligned. Before installation, thoroughly clean all connection surfaces with degreaser and check for scratches or corrosion on metal pipes. Ensure boots are fully seated - they should overlap pipe connections by at least 2 inches. Also inspect the CAC core itself for internal leaks, as pinholes in the cooler can cause boost loss that new boots won't fix.

Can I use universal CAC hoses instead of model-specific ones?

While universal hoses can work, model-specific hoses are strongly recommended for Peterbilt 330/335/337 trucks. These models have unique routing requirements and bend angles that generic hoses may not accommodate properly. Improper bends can restrict airflow and create stress points leading to premature failure. OEM-style molded hoses maintain proper clearances from heat sources and moving components, ensuring reliable long-term performance.