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Does Intake manifold crack ever? 200 1988

posted by  someone claiming to be Benzo on  Tue Jan 19 06:54 CST 2010 [RELATED]

Traced a vacumleak to the intake manifold gasket and replaced it. When it was ofF I found gasoline in the manifold and throttle body ( this is not my "real" problem but could may give some leads), vacuum hose from FPR seemed dry and later when I checked fuel pressure it seemed fine to. Anyways, when I put everything back together the vacuum leak is still there in between the 2nd and 3rd injector. The surfaces on the head and manifold was undamaged. Coul;d there be a crack in the manifold?

Thanks
John








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    Does Intake manifold crack ever? 200 1988

    posted by  Steve on  Tue Jan 19 12:21 CST 2010
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    Have you changed the injector seals?

    BTW, while it is possible for a casting defect to emerge in almost anything, I've never heard of an intake manifold cracking. No heat or pressure there.
    --
    See the 700/900 FAQ at the drop-down menu above right.








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      Does Intake manifold crack ever? 200 1988

      posted by  someone claiming to be Benzo on  Sat Jan 23 07:51 CST 2010 [RELATED]

      I don't injector seals have been replaced ever and I should look into that. I think I've located the hissing sound to come from in between the head and gasket, I could just put some gasket sealer there for now right?








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        Does Intake manifold crack ever? 200 1988

        posted by  Steve on  Sat Jan 23 08:09 CST 2010
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        last visit: Fri Oct 24 07:16 CST 2014
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        It is fairly simple to remove the manifold and replace the gasket. Applying gasket "sealer" is tougher: you might make a bigger mess than it is worth; don't use silicone which will ruin your oxygen sensor. Some liquid vinyl electrical tape sealer would likely be best and easiest to scrape off when you do fix it.
        --
        See the 700/900 FAQ at the drop-down menu above right.








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          Does Intake manifold crack ever? 200 1988

          posted by  someone claiming to be Benzo on  Sat Jan 23 09:05 CST 2010 [RELATED]

          I was about to apply silicone, I'm glad I asked first. Thanks for the advice! I might just take it apart again and see if I screwed something up the first time. Is it possible to ruin the gasket if I tightend the bolts to much? I didn't have a torque wrench last time and now I can't remember how much I should tighten it.








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            Does Intake manifold crack ever? 200 1988

            posted by  KlausC on  Sun Jan 24 04:47 CST 2010
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            last visit: Fri Oct 24 10:15 CST 2014
            [RELATED]

            Intake and exhaust are both bolted at 15 lbs. Which is not very much, kind of 'snug' if you don't use a torque wrench. The real problem is having a couple too tight. Start torquing in the middle bolts and work your way to the front and back.

            Klaus
            --
            Proud owner of a 220S. If I had more room, I would have more Volvos.








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            Does Intake manifold crack ever? 200 1988

            posted by  Jorrell on  Sat Jan 23 09:31 CST 2010
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            last visit: Thu Dec 27 03:00 CST 2012
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            If you take the intake manifold off again, check the mating surface of it for flatness. If it is warped take it to a machine shop to have it resurfaced. I have run into this once and the warp was in excess of 0.1", more than enough to cause a leak.

            jorrell
            --
            92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!








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              Does Intake manifold crack ever? 200 1988

              posted by  someone claiming to be Benzo on  Sun Jan 24 10:14 CST 2010 [RELATED]

              Klaus: I'll retorque and hopefully that will work.

              Jorrell: If retorque it won't work I'll definetly check if it is warped.

              Thanks guys!







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