GM Service Manual Online
For 1990-2009 cars only

2 Piece Pump Only - Some Models

Size Classification

Thickness (mm)

Thickness (in)

Important: 

   • Rotor, vanes and slide must be chosen from the same size classification as the oil pump body.
   • Allowable rotor, vane and slide to oil pump body end play is as follows:

Specification

   • 

Slide to Oil Pump Body End Play -- 0.033-0.076 mm (0.0013-0.0030 in)

   • 

Rotor and Vane to Oil Pump Body End Play -- 0.050-0.083 mm (0.0020-0.0033 in)

The oil pump assembly has a selective rotor, vane and slide components. These components are chosen based on pump body dimensions. Oil pump body, rotor, vane and slide components are available in four size classifications (1, 2, 3 and 4) with the following tolerances:

Rotor Selection

1

17.953-17.963

0.7068-0.7072

2

17.963-17.973

0.7072-0.7076

3

17.973-17.983

0.7076-0.7080

4

17.983-17.993

0.7080-0.7084

Vane Selection

1

17.943-17.961

0.7064-0.7071

2

17.943-17.961

0.7064-0.7071

3

17.961-17.979

0.7071-0.7078

4

17.961-17.979

0.7071-0.7078

Slide Selection

1

17.957-17.967

0.7070-0.7074

2

17.967-17.977

0.7074-0.7078

3

17.977-17.987

0.7078-0.7081

4

17.987-17.997

0.7081-0.7085

Oil Pump Body Depth

1

18.000-18.010

0.7087-0.7091

2

18.010-18.020

0.7091-0.7094

3

18.020-17.030

0.7094-0.7098

4

18.030-18.040

0.7098-0.7102