Cloyes S797 Engine Timing Crankshaft Sprocket - Outer

Cloyes S797 Timing Crankshaft Sprocket

The Cloyes S797 is an engine timing crankshaft sprocket built for specific GM applications that use a silent chain setup with .40 in./.41 in. tooth width. It features a helical tooth form for quieter operation and a precision-machined bore for a true fit during engine rebuilds and timing service.

Key Features

• Metal construction with a gray finish
• 18-tooth crankshaft sprocket design
• 1-row chain configuration
• Precision-machined bore for accurate fitment
• Helical tooth form for reduced operating noise
• Keyway notch included for proper indexing
• Specific fit application, not universal

Detailed Product Overview

Cloyes S797 is engineered as a replacement crankshaft sprocket for select Chevrolet, GMC, Cadillac, Buick, Pontiac, and Oldsmobile engines. It is used in timing systems where the crankshaft sprocket works with the timing chain, tensioner, and guides to maintain correct camshaft and crankshaft synchronization. This part cross-references 10128346 for the same application. For Chevrolet Camaro, Chevrolet Corvette, and GMC Savana timing service, the S797 provides the correct tooth profile and bore dimensions for the listed outer-position applications.

Common Problems This Part Can Address

• Worn or damaged crankshaft sprocket teeth
• Timing chain noise caused by sprocket wear
• Improper chain tracking from an out-of-spec sprocket
• Timing system service on high-mileage GM engines
• Engine rebuilds requiring a direct-fit timing sprocket

Installation Notes and Tips

Verify engine code, tooth width, and position before installation. This part is listed for outer-position timing applications and specific GM engine combinations, including L30, L31, LT1, L05, L03, and L98 references in the fitment data. Cloyes recommends replacing the chain tensioner, sprocket, and guide components together when servicing the timing chain so the system maintains proper tension and alignment. Fits 1996-2002 Chevrolet Express 1500, Outer; Fits 1996-2002 Chevrolet Express 2500, Outer; Fits 1996-2002 Chevrolet Express 3500, Outer; Fits 1996-2002 GMC Savana 1500, Outer; Fits 1996-2002 GMC Savana 2500, Outer; Fits 1997-2002 GMC Savana 3500, Outer; Fits 1999-2000 Cadillac Escalade, Outer; Fits 1996-2000 Chevrolet Tahoe, Outer; Fits 1996-2000 GMC Yukon, Outer; Fits 1993-1997 Chevrolet Camaro, Outer; Fits 1993-1997 Pontiac Firebird, Outer; Fits 1992-1996 Chevrolet Corvette, Outer.

Quality Assurance

Cloyes designs these timing components using CAD-based engineering and advanced materials, then tests each part for function and durability to support reliable engine service.