Hyundai Sonata 1991 Shop Manual page 486

Oil PUMP ASSEMBLY
7. Remove two seal rings from reaction shaft support.
Seal rings
INSPECTION
1. Measure the side clearance of the oil pump gear; if the
clearance exceeds the standard value, or if an inspection of
the surface (of the oil pump housing) that contacts the oil
pump gear reveals indications of interference, replace the
entire oil pump assembly.
Standard value: 0.03-0.05 mm (0.0012-0020 in.)
2. Check the surface of the reaction shaft support that contacts
the oil pump gear; if there are indications of interference,
replace the entire oil pump assembly.
REASSEMBLY
1. Install the oil seal to the oil pump drive gear.
2. Install the snap ring.
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. 45-97