Cloyes S865A Engine Timing Idler Sprocket

Cloyes S865A Timing Idler Sprocket

The Cloyes S865A engine timing idler sprocket is a specific-fit replacement for select Dodge, Jeep, and Mitsubishi applications that use a silent type chain. Built with a helical tooth form for quieter operation and a precision-machined bore for accurate fit, it supports reliable timing system operation during engine rebuilds and timing service.

• Metal construction with gray finish
• Specific fit timing idler sprocket for select applications
• Helical tooth design for quieter chain engagement
• Precision-machined bore for true fit
• Three-row design with 30/30/50 tooth configuration
• Outside diameter: 5.052 in.; inside diameter: 1.18 in.; thickness: 2.39 in.
• Mount hole inside diameter: 1.18 in.

Application Details

This Cloyes timing sprocket is used in timing system service where the idler sprocket must match the engine’s chain layout and silent chain requirement. It cross-references 53021021 for the same application. The S865A is listed for 1999-2006 Jeep Grand Cherokee, 2000-2006 Dodge Dakota, 2000-2006 Dodge Durango, 2002-2007 Dodge Ram 1500, 2006 Jeep Commander, and 2006-2007 Mitsubishi Raider.

What It Helps Address

• Timing chain noise from worn sprocket teeth
• Incorrect chain tracking in the timing system
• Fitment issues caused by a worn or damaged idler sprocket
• Timing service needs during engine rebuilds
• Replacement of a secondary sprocket in silent chain applications

Installation Notes

Verify engine-specific fitment before installation, since this part is application-specific and requires a silent type chain in the listed vehicles. Cloyes recommends replacing the chain tensioner(s), sprocket(s), and guide(s) together when servicing the timing chain to maintain proper chain support and tension. For best results, confirm the timing set layout and component match before assembly.

Quality Assurance

Cloyes designs these timing components using CAD-based engineering and advanced materials, then tests them for function and durability to support dependable engine service. The S865A is built for timing system accuracy and consistent operation in the listed applications.