Oil Pump Inspection

Oil Pump Inspection

Visual Inspection
^ Check outer rotor (3), inner rotor and oil pump cases (1), (2) for excessive wear or damage. If abnormal condition is found in above checks, replace oil pump assembly.
^ Check relief valve (4) for excessive wear or damage.
If abnormal condition is found in above checks, replace oil pump relief valve set.








Relief Valve Spring Free Length and Load
^ Measure free length and tension of oil relief spring. If the measured values of length or tension is less than the specification, replace oil pump relief valve set.

Oil relief spring











Radial Clearance
Check radial clearance between outer rotor (2) and case No. 1 (1), using thickness gauge (4). If clearance exceeds its limit, replace oil pump assembly.
Limit on radial clearance between outer rotor and case 0.20 mm (0.0079 in.)








Side Clearance
Using straightedge (5) and thickness gauge (4), measure side clearance. If side clearance exceeds its limit, replace oil pump assembly.
Limit on side clearance 0.11 mm (0.0043 in.)