Cummins Engine Serpentine Belt Diagram: Understanding Belt Routing and Function

The Cummins engine serpentine belt diagram is essential for anyone performing maintenance or belt replacement on their diesel engine. This single, continuous belt drives multiple components — including the alternator, water pump, power steering pump, and air conditioning compressor — ensuring your Cummins engine runs smoothly and efficiently.

Why the Serpentine Belt Diagram Matters

A correct belt routing diagram helps ensure proper tension and alignment. Incorrect installation can cause the belt to slip, squeal, or even break, leading to engine overheating, loss of power steering, or battery charging failure. Each Cummins engine model — such as the 5.9L, 6.7L, or ISX series — has a slightly different routing pattern, so always refer to the specific diagram for your engine type.

Common Signs of Belt Problems

If your Cummins engine shows squeaking noises, visible cracks on the belt, or accessories not operating properly, it’s likely time for a replacement. Worn or misaligned belts can cause unnecessary strain on pulleys and tensioners, accelerating wear on other parts.

Maintenance Tip

When replacing the serpentine belt, inspect the tensioner and pulleys for damage and ensure the new belt follows the Cummins engine serpentine belt diagram precisely. Using genuine or high-quality aftermarket parts will help maintain reliability and extend your engine’s service life.

Related Articles: Step-by-Step Guide to Replacing a Cummins Engine Belt