Lubrication System: Inspection

Inspect the relief plunger.
Coat the plunger with engine oil and check that it falls smoothly into the plunger hole by its own weight. If it does not, replace the relief plunger. If necessary, replace the front case.
Inspect the relief valve spring. Inspect for distorted or broken relief valve spring.
Standard value:

Free height: 43.8 mm (1.724 in)

Load: 3.7+/-0.4 kg/40.1 mm (8.2+/-0.9 lb/1.579 in) 9.7+/-0.4 kg/34.3 mm (21.4+/-0.9 lb/1.350 in)
Inspect the rotor side clearance. Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.

Fig 1: Measuring Rotor Side Clearance
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Identifying Rotor Side Clearance Specification Chart
Courtesy of KIA MOTORS AMERICA, INC.

If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the front case.
Inspect the rotor tip clearance. Using a feeler gauge, measure the tip clearance between the inner and outer rotor tips.
Tip clearance: 0.025-0.069 mm (0.0010-0.0027 in)

Fig 3: Measuring Rotor Tip Clearance
Courtesy of KIA MOTORS AMERICA, INC.

If the tip clearance is greater than maximum, replace the rotors as a set.
Inspect the rotor body clearance. Using a feeler gauge, measure the clearance between the outer rotor and body.
Body clearance: 0.120-0.185 mm (0.0047-0.0073 in)

Fig 4: Measuring Rotor Body Clearance
Courtesy of KIA MOTORS AMERICA, INC.

If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the front case.