Oil Pump: Testing and Inspection
INSPECTION OF OIL PUMP1. MEASURE BODY CLEARANCE
Using a feeler gauge, measure the clearance between the driven rotor and pump body.
Standard clearance:
4A-FE: 0.080 - 0.180 mm (0.0031 - 0.0071 in.)
4A-GE: 0.100 - 0.191 mm (0.0039 - 0.0075 in.)
Maximum clearance: 0.20 mm (0.0079 in.)
If the clearance is greater than maximum, replace the rotor set and/or body.
2. MEASURE TIP CLEARANCE
Using a feeler gauge, measure the clearance between both rotor tips.
Standard clearance:
4A-FE: 0.025 - 0.085 mm (0.0010 - 0.0033 in.)
4A-GE: 0.060 - 0.180 mm (0.0023 - 0.0071 in.)
Maximum clearance: 0.35 mm (0.0138 in.)
If the clearance is greater than maximum, replace the rotor set.
3. MEASURE SIDE CLEARANCE
Using a feeler gauge and flat block, measure the side clearance as shown.
Standard clearance:
4A-F:E 0.025 - 0.085 mm (0.0010 - 0.0033 in.)
4A-GE: 0.025 - 0.075 mm (0.0010 - 0.0030 in.)
Maximum clearance: 0.10 mm (0.0039 in.)
If the clearance is greater than maximum, replace the rotor set and/or body.
4. REPLACE OF OIL SEAL