No compression on all cylinders after replacing the timing chain

Tiny
RANDY1955
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I replaced my timing chain I have all the marks all in align but now I have no compression on all cylinders. Can someone explain?
Thursday, April 15th, 2021 AT 9:13 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Most likely you have valve damage from the failed chain. The pistons hit the valves and bent the ends and that will prevent compression.

https://www.2carpros.com/articles/how-a-cylinder-head-works

You will need a machine shop to either replace all the valves or get yourself a rebuilt set of heads.

Roy
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Thursday, April 15th, 2021 AT 9:34 AM

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