2003 Chevrolet Trailblazer timing chain

2003 CHEVROLET TRAILBLAZER
4.2L • 6 CYL • 4WD • AUTOMATIC
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TRECIA
  • MEMBER
  • 1 POST
I changed the timing chain and now the oil pump won't engage
Oct 15, 2014 at 9:19 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
The oil pump is driven directly from the crankshaft. The drive gear is a slip fit design. Either the gear is bad, the pump is bad, or you forgot something. Did you install the relief valve plug? Were the drive gears correctly installed? Take a look at the pic below and see if anything was missed.
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Oct 15, 2014 at 7:42 PM
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