1998 Chevy Lumina Need some ideas on what to look for?

Tiny
MARTWEIN
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 132,000 MILES
I replaced the intake manifold gaskets on this car. I made damn (3-times making sure) that the pushrods went back in the same spot. I put it all back together and when I tried to start it, it had no compression. I immediately tore it back down to the pushrods. I took each pushrod and measured them individually. The exhaust rods were 6 inch and the intake were around 5 3/4. They were installed correctly. I put it back together and still no compression? I did a compression check on each cylinder. (1=65) (2=90) (3=90) (4=120) (5=150) (6=60). I know each cylinder should be over 100psi. Any ideas of why I would have no compression when the pushrods were installed correctly? I should not have any bent valves? I also torqued the rocker arms to 124 in lbs with an additional 30 degrees. I have also read it should be 89 in lbs with an additional 30 degrees. With 124 are my valves too tight?
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Tuesday, April 28th, 2009 AT 9:55 PM

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Tiny
DOCFIXIT
  • EXPERT
124 and 30 is correct. Recheck that you are getting the shorter one on the intake and longer on exhaust.
Injector will locate the rocker for intake.
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Wednesday, April 29th, 2009 AT 10:34 AM
Tiny
MARTWEIN
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124 inch lbs is TOO TIGHT on those valves. I re- torqued them to 89 inch lbs with an additional 30 degree turn and it fired right up. All Data's TSB is incorrect.
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Wednesday, April 29th, 2009 AT 12:57 PM
Tiny
DOCFIXIT
  • EXPERT
That's good to know Mitchel said 124. Checked all Gm TSB they do not mention any change. Is this a 3.1L?
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Wednesday, April 29th, 2009 AT 3:16 PM

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