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03 chevy truck 5.3l no oil pressure after replacing cam

Customer Question

03 chevy truck 5.3l no oil pressure after replacing cam
Submitted: 8 years ago.
Category: GM
Expert:  MPMoore replied 8 years ago.
The oil pump is located on the crankshaft, the balancer when installed drives the oil pump. If you removed the oil pump or moved it when the front cover was off, you may have moved the sealing o-ring on the oil pump pick-up tube. make sure the balancer is torqued down properly. if the balancer is torqued down, you may have to remove the front cover and check the oil pick-up tube to make sure the o-ring is in place.

Installation Procedure

Object Number: 64281  Size: SH
  1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
  2. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.
  3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the oil pump bolts.
  5. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


  6. Lubricate a NEW oil pump screen O-ring seal with clean engine oil.
  7. Install the NEW O-ring seal onto the oil pump screen.
  8. Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.
  9. Install the oil pump screen.
  10. Install the oil pump screen bolt and nuts.
    1. Tighten the bolt to 12 N·m (106 lb in).
    2. Tighten the nuts to 25 N·m (18 lb ft).
  11. Install the engine front cover. Refer to Engine Front Cover Replacement .
  12. Install the oil pan. Refer to Oil Pan Replacement .

Expert:  MPMoore replied 8 years ago.
During the cam replacement, where the cam bearings replaced?