2003 Chevrolet Trailblazer timing chain

Tiny
TRECIA
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
I changed the timing chain and now the oil pump won't engage
Wednesday, October 15th, 2014 AT 9:19 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
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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Wednesday, October 15th, 2014 AT 7:42 PM

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