Oil Pump Installation - Off Vehicle

Tools Required

• EN-48036  Oil Pump Alignment Tool. See Special Tools .
• J 45059  Angle Meter

Fig 1: Friction Washers
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure the proper friction washer is installed in the correct position.
1. Select the crankshaft sprocket to oil pump drive friction washer (2). The outer diameter is 55.0 mm (2.1654 in) and an inner diameter, including tabs, of 35.0 mm (1.3780 in).
Fig 2: Crankshaft Sprocket To Oil Pump Drive Friction Washer
Courtesy of GENERAL MOTORS CORP.
2. Install the crankshaft sprocket to oil pump drive friction washer.
Fig 3: Oil Pump
Courtesy of GENERAL MOTORS CORP.
3. Install the oil pump.
Fig 4: EN-48036
Courtesy of GENERAL MOTORS CORP.
NOTE: The EN 48036 must be used during the installation of the oil pump. Failure to use the EN 48036 to align the oil pump to the crankshaft can lead to oil pump damage and severe engine damage.
4. Install the EN-48036  over the crankshaft nose and up to the oil pump. See Special Tools .
Fig 5: Oil Pump Bolts
Courtesy of GENERAL MOTORS CORP.
5. Loosely install the oil pump bolts.
Fig 6: EN-48036
Courtesy of GENERAL MOTORS CORP.
6. Apply force by hand to the EN-48036  against the oil pump in order to align the oil pump to the oil pump drive. See Special Tools .
Fig 7: Oil Pump Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice .
7. While keeping hand force on the EN-48036  tighten the oil pump bolts in sequence (1, 2, 3) as shown. See Special Tools .
   1. First Pass

      Tighten:  Tighten the oil pump bolts in sequence to 10 N.m (89 lb in).

   2. Final Pass

      Tighten:  Tighten the oil pump bolts in sequence an additional 35 degrees using the J 45059  .

Fig 8: EN-48036
Courtesy of GENERAL MOTORS CORP.
8. Remove the EN-48036  . See Special Tools .