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Oil Pump Cleaning and Inspection

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    Fig 1: View Of Oil Pump Gear Cover & Bolts
    GM663597Courtesy of GENERAL MOTORS CORP.
  1. Remove the oil pump gear cover bolts.
  2. Remove the oil pump gear cover.
    3. Fig 2: Measuring Clearance Between Gear Teeth & Oil Pump Housing
    GM663599Courtesy of GENERAL MOTORS CORP.
  3. Use a feeler gauge to measure the clearance between the gear teeth and the oil pump housing. The production clearance is 0.125-0.221 mm (0.0049-0.0087 in) and the service limit is 0.221 mm (0.0087 in).
  4. Replace the oil pump assembly if the clearance exceeds the service limit.
    5. Fig 3: Measuring Clearance Between Side Of Gear & Cover
    GM663603Courtesy of GENERAL MOTORS CORP.
  5. Use a feeler gauge and a straightedge to measure the clearance between the side of the gear and the cover. The production clearance is 0.064-0.109 mm (0.0025-0.0043 in) and the service limit is 0.109 mm (0.0043 in).
  6. Replace the oil pump assembly if the clearance exceeds the service limit.
    7. Fig 4: View Of Driven Gear Shaft & Bushing Measurements
    GM663609Courtesy of GENERAL MOTORS CORP.
  7. Calculate the driven gear shaft to bushing clearance.
    1. Measure the driven gear shaft outside diameter. The production specification is 19.947-19.960 mm (0.7853-0.7858 in) and the service limit is 19.86 mm (0.7819 in).
    2. Measure the driven gear bushing inside diameter. The production value is 20 mm (0.7874 in).
    3. Calculate the driven gear shaft to bushing clearance. The service limit is 0.14 mm (0.0055 in)
  8. Replace the oil pump assembly if the clearance exceeds the service limit.
    9. Fig 5: View Of Oil Pump Gear Cover & Bolts
    GM663597Courtesy of GENERAL MOTORS CORP.
  9. Install the oil pump gear cover to the oil pump assembly.
    10. CAUTION: Refer to Fastener Caution .
  10. Install the oil pump gear cover bolts and tighten to 21 N.m (15 lb ft).
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