Chevrolet TrailBlazer:

Exhaust Manifold Torque Specs

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#1 12/2/2010 1:29 AM

Ritchy
Senior Member
Registered: 5/13/2010
Posts: 72

Exhaust Manifold Torque Specs

Hi. I'm looking for the exhaust manifold to head bolt torque specs for a 2002 Chevy Trailblazer EXT with a 4.2L. Thanks.

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#2 12/3/2010 2:34 PM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1298

Re: Exhaust Manifold Torque Specs

First install all the bolts into the exhaust manifold and snug them hand tight.

Start at the center bolt of the manifold and tighten it to 18 ft lbs, then go to the next one to the rear of the center bolt and then go to the one in front of the center bolt you tightened.

Keep working your way out to the outer ones in the same manor.

Do the same sequence again and re-tighten the bolts to 18 ft lbs again. In the same sequence check it again a third time at 18 ft lbs.

So your working from the center bolts to the outer bolts.

If you need more information let me know.


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#3 12/3/2010 8:07 PM

Ritchy
Senior Member
Registered: 5/13/2010
Posts: 72

Re: Exhaust Manifold Torque Specs

Thanks a lot for the info TH2. This is the part I was missing.

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