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Home >> Chevrolet >> 1990 >> Astro Van M L4-151 2.5L >> Repair and Diagnosis >> Specifications >> Mechanical Specifications >> Engine >> Oil Pump, Engine >> Dimension/Clearance Specifications

Dimension/Clearance Specifications

Rotor Backlash 0.0009-0.015
Rotor To Body Clearance 0.004
Note: Maximum
Rotor End Clearance
Note: Measured between pump cover mating surface & end of rotors using straightedge & suitable feeler gauges.
0.002-0.005
Gear Pocket Depth 0.995-0.998
Diameter 1.503-1.506
Rotor Thickness 0.999-1.002
Rotor Diameter 1.496-1.500
Relief Valve To Body Clearance 0.0015-0.0035