INTAKE & EXHAUST

Intake & Exhaust Parts For Peterbilt Trucks

The intake and exhaust systems on a heavy-duty diesel work in tandem to deliver clean, dense air to the combustion chamber and route spent gases safely away from the engine and cab. Both systems include components that wear, crack, and leak over miles and heat cycles -- intake ducts, air filter housings, exhaust manifolds, flex sections, and aftertreatment connections all require periodic inspection and eventual replacement. We carry intake and exhaust parts for Peterbilt trucks from air filter to stack.

Frequently asked questions about intake & exhaust parts

What intake components most commonly wear out on a Peterbilt diesel?

The air intake duct -- the flexible rubber or plastic section between the air filter housing and turbocharger inlet -- is the most frequently replaced intake component. It cracks from heat and vibration over time and clamps loosen from vibration at both ends. The air filter housing itself can crack from debris impacts. On EGR-equipped engines, the EGR cooler and related tubing are wear items that fail on high-mileage trucks.

Can a leaking intake duct damage my Peterbilt's engine?

Yes. A crack or loose clamp in the intake duct downstream of the air filter allows unfiltered air to enter the turbocharger and engine. Dust and abrasive particles in unfiltered air cause accelerated wear on turbocharger compressor blades and engine cylinder walls, bearings, and rings. Even a small air leak can allow significant contamination over thousands of miles. Inspect the full intake duct for cracks and confirm all clamps are properly tightened at every service.

How do I know if my Peterbilt has an exhaust manifold leak?

An exhaust manifold leak produces a distinctive ticking or tapping sound most pronounced on cold start, typically diminishing as the engine warms up and the manifold expands. Carbon-stained streaks radiating from a gasket joint or cracked manifold section are visual confirmation. Exhaust leaks forward of the aftertreatment system can also trigger fault codes related to exhaust temperature or backpressure sensors. Any exhaust leak near the cab fresh air intake is a safety concern requiring immediate attention.

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