BCBC S853 Engine Balance Shaft Sprocket - Left

Engine Balance Shaft Sprocket Overview

This Melling engine balance shaft sprocket, part number S853, is a standard replacement component for applications that use a 21-tooth balance shaft drive. It is built from high alloy steel to address wear that can cause timing drift in the balance shaft system.

Compatible with a wide range of GM and Saab applications, including Chevrolet Malibu, Chevrolet Equinox, and Buick Regal fitments, this sprocket is intended for stock-style service replacement. The S853 is a practical choice when the original sprocket has worn smaller over time and the balance shaft needs to be brought back into proper time.

Key Features

• High alloy steel construction for wear resistance
• Standard replacement design for stock applications
• 21-tooth sprocket configuration
• 1.950 in. outside diameter
• 0.475 in. maximum thickness

Detailed Description

The Melling S853 balance shaft sprocket is engineered as a direct service replacement for worn OEM-style sprockets in compatible engine balance shaft systems. As the original sprocket wears, its effective size changes and the balance shaft can move slightly out of time. This replacement sprocket restores the drive interface with a durable high alloy steel construction and dimensions that match the intended application.

Fitment includes 2010-2017 Chevrolet Equinox, left; 2011-2017 Buick Regal, left; and 2001-2011 Saab 9-3, left, along with additional Buick, Chevrolet, Pontiac, Saturn, and GMC applications. For buyers searching for a Chevrolet Malibu balance shaft sprocket, Buick Regal engine timing component, or Saab 9-3 balance shaft sprocket, S853 provides a stock-style replacement option.

This part cross-references Cloyes S853 and Standard Ignition S-853 for the same application.

What It Is Used For

• Correcting balance shaft timing drift caused by sprocket wear
• Replacing a worn sprocket that has reduced in size over time
• Restoring proper balance shaft drive engagement
• Addressing noise or vibration concerns related to timing wear
• Servicing stock engine balance shaft systems with a replacement sprocket

Installation Notes and Quality

Install this sprocket only on confirmed matching applications and verify tooth count, outside diameter, and thickness before assembly. Because fitment varies by engine family and model year, confirm the vehicle listing and existing component dimensions before installation. Part number S853 is a standard replacement component from Melling, a brand known for engine valvetrain and timing-related service parts.