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Home >> Toyota >> 1973 >> Hi-Lux Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> TOYOTA Engines - (8R-C & 18R-C Engines) 4 Cylinder >> 1969-73 TOYOTA (8R-C & 18R-C Engines) 4 Cylinder >> Oil Pump Checking

Oil Pump Checking

  1. Disassemble oil pump and check for wear or damage. Measure diameter of drive rotor. If rotor diameter is less than 1.403", replace drive rotor and driven rotor as a set.
  2. Measure diameter of driven rotor. If diameter less than 1.967", replace drive rotor and driven rotor as a set. Measure tip clearance between drive rotor and driven rotor. If clearance exceeds 0.008", replace drive rotor and driven rotor as a set.
  3. Measure side clearance between rotors and mating surface of pump cover. If clearance exceeds 0.006", replace rotors. Measure clearance between driven rotor and pump body. If clearance exceeds 0.008", replace pump body.
  4. Check relief valve spring for stretch. If free length of spring is more than 1.85", replace spring. Make sure that all oil passages in pump body are clear. When replacing rotors in pump make sure that marks on each rotor are in alignment.
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