GM Genuine Parts Crankshaft Sprocket
OE
Pack of 1

GM Genuine Parts Crankshaft Sprocket

GM Part #55509047

ACDelco Part #55509047

MSRP$35.18*

GM Genuine Parts Engine Timing Crankshaft Sprockets are designed, engineered, and tested to rigorous standards, and are backed by General Motors.

  • Gear attached to the crankshaft that timing chain rides on
  • Synchronizes with the camshaft sprocket with the use of a timing chain
  • Part of the valve train system that opens and closes the valves at the appropriate time in the combustion cycle

Pack of 1

About this product

GM Genuine Parts Engine Timing Crankshaft Sprockets are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These sprockets are part of the valve train system that opens and closes the valves at the appropriate time in the combustion cycle. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Warning WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

  • Gear attached to the crankshaft that timing chain rides on
  • Synchronizes with the camshaft sprocket with the use of a timing chain
  • Part of the valve train system that opens and closes the valves at the appropriate time in the combustion cycle
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment [OE]
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies

Thickness1.91 in / 48.4 mm
ClassificationOE
Inside Diameter0.67 in / 17 mm
Outside Diameter2.27 in / 57.78 mm
Keyway AdjustableYes
Tooth Quantity22

24 Months/Unlimited Miles Limited Warranty for Parts (plus Labor if installed by a GM dealer)

Please visit our warranty page on Gmparts.com for full warranty details.

Good Maintenance Practices:

  • Before purchasing and installing an engine timing crankshaft sprocket, make sure it is the correct fit for your vehicle
  • Keep engine oil changed and level full for proper lubrication
  • Keep coolant level full to prevent overheating
  • Have valve train serviced by a technician at first sign of problem
  • Regularly inspect engine timing crankshaft sprockets for signs of damage or wear, and replace them if signs of damage are found

Signs of wear for engine timing crankshaft sprockets include but are not limited to:

  • Poor engine performance
  • Rough engine idle
  • Exhaust backfire
  • Excessive noise in valve train

ModelBody StyleTrimYear(s)
BlazerLT, Premier2020, 2021, 2022, 2023, 2024, 2025, 2026

Frequently Asked Questions

Yes. Always consult the Vehicle Owner's Manual or an expert technician before making any repairs or adjustments.

Replacing any part of the timing chain components require advanced technical knowledge and special tools. Consult a certified technician.