Cloyes S859 Engine Timing Crankshaft Sprocket - Outer

Cloyes S859 Timing Crankshaft Sprocket

The Cloyes S859 is a specific-fit engine timing crankshaft sprocket for select Ford, Mazda, and Mercury applications. Built with a precision-machined bore and helical tooth form, it supports quiet timing system operation and accurate crankshaft-to-chain engagement.

Key Features

• Metal construction with a gray finish
• 19-tooth crankshaft sprocket design
• Specific fit for application-matched installation
• Precision-machined bore for true fit
• Helical tooth form for quieter operation
• Keyway notch included for proper indexing
• Single-row chain design

Detailed Description

Cloyes S859 is an engine timing crankshaft sprocket used in timing system service and engine rebuild work. It is engineered for vehicles such as the 1999-2008 Ford Ranger, 1999-2008 Mazda B3000, and 1999-2007 Ford Taurus, with additional coverage for 1999-2005 Mercury Sable and 1999-2000 Ford Windstar applications. The S859 part number is also referenced in interchange listings for YF1Z6306BA and ZZS111316. Cloyes designs and manufactures timing components using CAD-based development, advanced materials, and functional durability testing to help maintain reliable timing performance.

For timing chain service, Cloyes recommends replacing the chain tensioner, sprocket, and guide components together when the chain is replaced. That approach helps restore proper chain control and timing system alignment on Ford Ranger, Mazda B3000, and Ford Taurus engine applications that use this outer crankshaft sprocket.

What This Part Helps Address

• Worn or damaged crankshaft sprocket teeth
• Timing chain noise caused by sprocket wear
• Timing chain indexing issues during engine service
• Restoration of timing system operation during rebuilds
• Replacement of a failed outer timing sprocket on supported vehicles

Installation Notes and Tips

Verify engine application, position, and timing system configuration before installation. This S859 sprocket is a specific-fit part with a 1.25-inch inside diameter, 2.28-inch outside diameter, 0.78-inch thickness, and 0.41-inch tooth width. It is intended for outer position use and includes a keyway notch for alignment. Always inspect the chain, tensioner, and guides for wear before reassembly.

Quality Assurance

Cloyes manufactures timing components with CAD-designed engineering and tests each part for function and durability to support dependable engine service.