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Yup, my plenum gasket was toast (pics)

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  #1  
Old 03-14-2009, 11:46 PM
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Default Yup, my plenum gasket was toast (pics)

Finally got around to fixing the plenum gasket, and it needed it. Took me about 12 hours to get everything apart. This included finding tools, food and mountain dew breaks, and part runs. The only real problem I had was I broke the head off one of the manifold bolts. After cussing a blue streak and shooting a can of PB blaster at it, it came out no problem. The fuel rails were also kinda hard to remove. Taking the fan shroud off was the best decision I've ever made because it allowed me to stand in the engine bay instead of leaning over the fenders (which is a huge deal because I'm a short guy).

Here's a pic of what the vacuum gauge looked like after 30 seconds of idling


And the intake with the gasket still attached. You can see where it's bowing out on both sides. It was also starting to tare a little.


Here's a better picture to show the extent of the damage


The engine bay is a complete mess of wires and hoses. I need to thoroughly clean the lifter valley out since an avalanche of dirt, pine needles, and acorns fell into it when I took the manifold off (oops).


Tomorrow I get to install everything and see how she runs! I can't wait! Thanks to everyone who's helped me get this far.
 
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Old 03-14-2009, 11:50 PM
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damn, that does look like a mess lol
 
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Old 03-15-2009, 12:09 AM
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Dang ... you're a work ANIMAL !!

Clean that thing out GOOD.
 
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Old 03-15-2009, 12:21 AM
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Hey, CSXFAN. What kind of belly pan did you use? did you just replace the gasket? Just curious. Looks good though.
 
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Old 03-15-2009, 12:29 AM
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Can someone point out where the damage to the plenum is?
 
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Old 03-15-2009, 12:34 AM
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The gasket squeezing out between the bolts.
 
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Old 03-15-2009, 09:23 AM
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J415, I ordered a Hughes plenum gasket kit, so it came with a new aluminum pan and a metal gasket.

Can anyone tell me a decent way to clean out the lifter valley? There is a LOT of crap down in there.
 
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Old 03-15-2009, 09:30 AM
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Clean the fuel rail and replace the upper/lower injector O-rings. Inspect the injector inlets to insure they aren't clogged.
 
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Old 03-15-2009, 09:44 AM
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Originally Posted by CSXfan View Post
Can anyone tell me a decent way to clean out the lifter valley? There is a LOT of crap down in there.
start with a vacuum cleaner
then pick out any visible pieces by hand.
then flush with kerosene or diesel fuel and let it drain into oil pan.
then change the oil.

be sure and get all the acorns, those could plug up an oil drain passage.
and i don't know whether this is possible or not, but you might try to locate the oil drains, and poke a straight wire down them to make sure they are clear all the way down.
 
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Old 03-15-2009, 10:11 AM
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That gasket damage supports the theory that the bolts on the belly pan did in fact bottom out and not hold the gasket tight. My guess is that if you just replace the gasket and not the pan, you're looking at the same problem all over again down the road.
 
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