4. LUBRICATION SYSTEM MXU 550EXi/MXU500i INSPECTION Temporarily install the oil pump shaft. Install the outer and inner rotors into the oil pump body. Measure the tip clearance. Service limit: 0.2 mm (0.008 in) Measure at several points and use the largest reading to compare the service limit. Measure the pump body clearance. Service limit: 0.25 mm (0.01 in) Measure the side clearance with the straight edge and feeler gauge. Service limit: 0.12 mm (0.0048 in) 4-10