# What do the numbers mean on a serpentine belt?

## What do the numbers mean on a serpentine belt?

Most v-ribbed belts, commonly referred to as serpentine belts, contain two different part numbers. EXAMPLE: 6PK1003 » 6 – This indicates the number of ribs on the belt; therefore, this is a 6-rib belt. » PK – The “P” indicates a metric designation, and the “K” indicates the belt is automotive per SAE J1459.

### How do you read a belt part number?

Automotive belts start with either 4L (12.5mm wide) or 3L (9.5mm). The number following it is the outside length of the belt in tenths of inches. The inside length of the belt is typically 2″ less for a 4L belt, and 1-1/2″ less for a 3L belt. An example would be 4L460, which would be 46″ long outside, 44″ inside.

What is the effective length of a serpentine belt?

4. Belt Effective Length: The effective length of a belt is the length about the effective outside diameter of a sheave at a specified tension. The effective outside diameter of a sheave is measured where the groove top width is a dimension as specified by RMA, ASAE or SAE standards.

The 6 tells us the belt has 6 ribs. This is important because there are 6, 7, and 8 rib belts. Only the 6 rib works on our systems. the numbers 111o tells us this belt is 111 inches long. Had it been 111 1/5 inch long the zero would be a 5 for 1/2 inch fraction.

How does the serpentine belt work in an engine?

The serpentine belt powers many different parts within the engine. It’s connected to the crankshaft, which causes the belt to spin. As the belt spins through the engine, it spins all the pulleys it’s connected to. As each pulley spins, it powers the part to which it’s connected.

## When to replace O’Reilly serpentine belt tensioner?

Replacing the belt and tensioner may solve these problems. If there are cracks and other signs of wear on the belt, it may also be time to replace the serpentine belt. O’Reilly Auto Parts carries serpentine belts, tensioners, and all the parts you need for your complete repair.

### How many miles does a serpentine belt last?

A serpentine belt should last 50K-100K miles. To be more specific, older neoprene rubber belts last about 50K miles. Newer EPDM (Ethylene Propylene Diene Monomer) rubber belts last about 100K miles. It’s still possible for a serpentine belt to fail early, though.