Oil Pump: Installation

WARNING: This page is about a different car, the 2003 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Install in the reverse order of removal.

Do the following:

Apply liquid gasket to the mating surface of oil pump.
Liquid gasket:
1. Part No. 004403007
2. ThreeBond 1215 or equivalent
  
  Fig 1: Applying Liquid Gasket To Mating Surface Of Oil Pump
  Courtesy of SUBARU OF AMERICA, INC.
Replace the O-ring (A) with a new one.
Apply a coat of engine oil to the inside of oil seal.

Fig 2: Applying Coat Of Engine Oil To Inside Of Oil Seal
Courtesy of SUBARU OF AMERICA, INC.
Be careful not to scratch the oil seal when installing oil pump on cylinder block.
Position the oil pump, aligning the notched area with crankshaft, and push the oil pump straight.
CAUTION: Make sure the oil seal lip is not folded.
Install the oil pump.
1. Tightening torque: 6.4 N.m (0.65 kgf.m, 4.7 ft.lb)
Fig 3: Installing Oil Pump
Courtesy of SUBARU OF AMERICA, INC.