1994 Buick LeSabre Oil Pump Replacement Instructions

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The Buick division of General Motors manufactured eight generations of Lesabre cars between 1959 and 2005. The 1994 model is a seventh generation Lesabre, which was in production from 1992 to 1999. The 1994 Buick LeSabre had a 6-cylinder 3.8-liter engine with the oil pump attached to the front of the crankshaft. The oil pump in this vehicle contains an inner and outer gear which reside within the oil pump housing.

Tools Used[edit]

Socket wrench set
Petroleum jelly
Torque wrench

Oil Pump Replacement Instructions[edit]

  • Remove the cable on the battery's negative terminal with a socket wrench so that you don't start the engine during this procedure. Loosen the mounting bolts for the front cover of the engine and detach the cover.
  • Disconnect the oil filter adapter with a socket wrench. Detach the pressure regulator valve and spring from the engine block. Remove the screws that attach the oil pump housing to the front engine cover. Detach the oil pump housing from the engine cover.
  • Pull the inner and outer oil pump gears from the oil pump housing. Pack the housing with petroleum jelly and assemble the new oil pump gears into the oil pump housing.
  • Mount the oil pump housing to the engine cover and tighten the screws for the oil pump cover to 97 in. lbs. with a torque wrench. Install the pressure regulator spring and valve to the engine block.
  • Connect the oil filter adapter with a socket wrench and install the front engine cover to the engine. Attach the cable to the negative battery terminal.