Kent-Moore J45930-A Rear Crankshaft Main Seal Installer for Northstar V8 Engines

The Kent-Moore J45930-A is a professional-grade rear crankshaft main seal installer engineered specifically for Northstar Premium V8 engines found in Buick and Cadillac models. This updated tool was developed to address a design change in the crankshaft bolts used on 2006 and newer Northstar engines — the previous tool, J-45930, is incompatible with the revised bolt configuration on these later applications.

The J45930-A consolidates coverage across model years, servicing both 2006-and-up crankshaft seals as well as prior-year seal designs in a single tool. It is the required update for any Buick or Cadillac dealership or independent shop that does not already own the original J-45930. Manufactured in the USA, this tool meets OEM service procedure requirements for accurate, damage-free seal installation.

Key Features:

• Services both 2006-and-newer and prior-year rear crankshaft seals — one tool for all applications
• Required update tool for shops that do not have the original J-45930
• Replaces superseded tools: J-38817, J-38817-A, J-42842, and J-45930
• Designed for Northstar Premium V8 gas mechanical engines
• Made in USA to OEM tooling standards

Compatible Models:

• Pontiac Bonneville (1998–2005)
• Cadillac DeVille (1998–2005)
• Cadillac DTS (2006–2011)
• Buick Lucerne (2006–2011)
• Cadillac Seville (1998–2004)
• Cadillac SRX (2004–2011)
• Cadillac STS (2005–2011)

The Kent-Moore J45930-A is the definitive OEM-specified crankshaft seal installer for GM's Northstar V8 platform, ensuring proper seal seating depth and alignment every time.