Cloyes S249 Engine Timing Camshaft Sprocket - Front

Cloyes S249 Timing Camshaft Sprocket

Cloyes S249 is a specific-fit engine timing camshaft sprocket for front-mounted applications on select Ford and Mercury V8 engines. Built with a cast body, precision-machined bore, and helical tooth form, it is engineered for accurate chain engagement and quiet operation in timing system service.

Key Features

• Engine timing camshaft sprocket for single-row timing chain setups
• Specific fit design with 42 teeth
• Cast construction with gray finish
• Precision-machined 1.00 in. inside diameter for true fit
• Helical tooth form for quieter timing operation
• Keyway notch included for proper indexing
• Outside diameter: 5.03 in.; thickness: 0.88 in.; tooth width: 0.76 in.

Application Details

Compatible With 1955-1958 Ford Thunderbird, front, and 1959-1962 Mercury Colony Park, front. This part number, S249, is also referenced under interchange number EAA6256A for the same application. For restorations and engine rebuilds, Cloyes S249 provides the timing sprocket geometry needed to maintain correct camshaft timing in these classic Ford and Mercury engines.

What This Part Helps Address

• Worn or damaged camshaft sprocket teeth
• Timing chain noise from an aging sprocket surface
• Incorrect chain engagement caused by sprocket wear
• Timing system service during engine rebuilds
• Replacement of a front timing sprocket on classic Ford Thunderbird or Mercury Colony Park engines

Installation Notes

When replacing the timing chain, Cloyes recommends replacing the chain tensioner(s), sprocket(s), and guide(s) together so the timing set works as a matched system. Verify engine application, tooth count, and front position before installation. The precision-machined bore and keyway notch are important for correct alignment during timing setup.

Quality Assurance

Cloyes designs these timing components using CAD-based engineering and advanced materials, then tests them for function and durability before release. S249 is built for dependable service in engine rebuilds and standard replacement work.