Cloyes S551 Engine Timing Crankshaft Sprocket - Outer

Cloyes S551 Timing Crankshaft Sprocket

The Cloyes S551 is a specific-fit engine timing crankshaft sprocket for applications that require precise chain engagement and stable timing operation. Built from metal with a precision-machined bore and helical tooth form, it is designed for quiet running and accurate fit in timing system service.

Key Features

• Engine timing crankshaft sprocket for valve train service
• Specific fit design for confirmed vehicle applications
• Metal construction with gray finish
• Helical tooth form for quieter operation
• Precision-machined bore for true fit
• 18-tooth design with 0.79 in. tooth width
• Inside diameter: 0.98 in.; outside diameter: 2.32 in.; thickness: 0.91 in.
• Keyway notch included

Detailed Description

Cloyes S551 is an engine timing crankshaft sprocket engineered for timing system repair and rebuild work. It is used in specific-fit applications on 1985-1988 Chevrolet Nova, outer; 1983-1988 Toyota Corolla, outer; and 1980-1988 Toyota Tercel, outer. If you are servicing a Toyota Corolla timing belt sprocket or replacing a Chevrolet Nova outer timing belt sprocket, this part number provides the correct application match for those vehicles.

Cloyes manufactures timing gears and sprockets with CAD-based design and advanced materials, then tests each part for function and durability. The helical tooth profile helps promote quieter operation, while the machined bore supports accurate installation and consistent timing alignment. This part cross-references 94840050 and 1352115010 for the same application.

What This Part Helps Address

• Worn or damaged timing sprocket teeth
• Timing chain noise from an aging sprocket surface
• Incorrect chain engagement caused by sprocket wear
• Timing system service during engine rebuilds
• Replacement needs on a Toyota Corolla, Toyota Tercel, or Chevrolet Nova timing belt sprocket application

Installation Notes and Tips

Verify the outer position and application details before installation. Cloyes recommends replacing the chain tensioner, sprocket, and guide components together when servicing the timing chain, since these parts work together to maintain chain tension and timing stability. Confirm fitment by year, make, model, and position before assembly.

Quality Assurance

Cloyes designs and manufactures timing components using advanced materials and application-specific engineering. Each sprocket is tested for function and durability to support dependable engine timing service.