OEM Buick LeSabre Crankshaft Seal

Buick LeSabre Crankshaft Seal Parts and Q&A

• Crankshaft Seal, Front
  12582313
  Q: How to replace the front crankshaft seal on Buick LeSabre?

  A:

  The process to replace the crankshaft front oil seal begins by uninstalling the crankshaft balancer assembly with its bolt yet protecting the seal bore and contact surfaces from any damage. A screwdriver should be used for removing the crankshaft front oil seal. The installation requires a Seal Installer (J 35354) to position the new oil seal before using the crankshaft balancer bolt with the tool to tighten it until it properly settles in the engine front cover. Tear down the Seal Installer (J 35354) before applying lubricant GM P/N 10522497 or an equivalent to the crankshaft balancer seal surfaces. Then install both the balancer and its bolt.
• Rear Main Seal
  12582320
  Q: How to replace the rear crankshaft seal and housing on Buick LeSabre?

  A:

  Replacing the crankshaft rear oil seal and housing starts with coolant drainage from the cooling system and subsequent removal of the engine Oil Pan and Flywheel. Start by removing crankshaft rear oil seal housing bolts and subsequently removing the housing and finally the crankshaft rear oil seal. Take care to avoid harming the crankshaft outer diameter surface. Inspection of the bore's id must be performed before making gasket replacement decisions to determine if the crankshaft rear oil seal housing needs replacement or correction. If burrs or nicks exist on the crankshaft sealing surface you should repair the component or replace it entirely. Installation requires complete removal of the old crankshaft rear oil seal and subsequent cleaning of both housing and cylinder block surfaces before installing a new gasket on the housing bolt threads for correct location. Housing alignment needs to be precise throughout installation to stop oil leaks from happening. Install the crankshaft rear oil seal housing while keeping the bolts finger-tight to enable adjustment until the gasket stays lower than the housing. Apply oil to both sides of the rear cover aligner (J 41349) before placing it over the crankshaft by twisting for proper installation. A straight edge should be used to inspect the cylinder block Oil Pan flange and the rear oil seal housing flange alongside a feeler gauge for a maximum step of 0.004 inch (0.1016 millimeters) on either side while making necessary adjustments. Use the electronic torque angle meter (J 36660-A) to turn crankshaft rear oil seal housing bolts to 15 nm (11 ft. Lbs.) for an additional 50-degree rotation. Use the rear cover aligner to check the step height after removing the j 41349 part to validate the housing position following bolt tightening. The process needs to be restarted when step movement occurs but keep the steps under 0.004 inches (0.1016 millimeters). The next step involves installing the new crankshaft rear oil seal then moving onto executing the engine Flywheel and Oil Pan installation before adding engine coolant to the cooling system.