INA ZS-S645 Engine Timing Crankshaft Sprocket

INA ZS-S645 Timing Crankshaft Sprocket

The INA ZS-S645 is an engine timing crankshaft sprocket built for OE-style fit and performance in a wide range of GM trucks, vans, and SUVs. It is a direct replacement for applications such as Chevrolet Express 1500, GMC Savana 2500, and Chevrolet Tahoe models that use this timing gear.

• Engine timing crankshaft sprocket for valve train service
• Made from powdered metal, steel, or cast iron, depending on application design
• Heat treated to exact hardness specifications for consistent wear characteristics
• OE-quality replacement for select Chevrolet, GMC, and Cadillac applications
• Cross-references INA Global Number 554 0768 100

Application Coverage

Compatible With 1980-2002 Chevrolet and GMC V8 truck, van, and SUV platforms, including Fits 1996-2002 Chevrolet Express 1500, N/A; Fits 1996-2002 GMC Savana 3500, N/A; and Fits 1995-2000 Chevrolet Tahoe, N/A. It also covers many classic GM C/K, G, R, and V series models, plus the 1999-2000 Cadillac Escalade, N/A.

This part cross-references INA Global Number 554 0768 100 for the same application.

What This Part Helps Address

• Worn or damaged crankshaft sprocket teeth
• Timing chain drive noise from sprocket wear
• Incorrect cam-to-crank timing caused by a failing gear
• Service replacement during timing set repair
• Restoration work on older Chevrolet and GMC engines

Installation Notes

Verify engine code, timing set design, and tooth count before installation. Inspect the timing chain, guides, and related valve train components at the same time, since sprocket wear often occurs with other timing system parts. Confirm fitment against the vehicle listing for your exact year, make, and model before ordering.

Quality Assurance

INA timing gears and sprockets are manufactured to meet or exceed OE quality and performance expectations. The ZS-S645 is produced from high-grade metal materials and heat treated to precise hardness standards for dependable service in timing applications.