2003 Head Gasket Repair - Page 6
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Northstar Engines and System Technical Discussion Discussion, 2003 Head Gasket Repair in Cadillac Engine Technical Discussion; Not positive, but I believe that's the old style cover....
  1. #76
    MoistCabbage's Avatar
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    Not positive, but I believe that's the old style cover.

  2. #77
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    Re: 2003 STS coolant leak (possible crossover leak)?

    gasket.jpgalso on the ac delco gasket there is a tab at the bottom right of the gasket and the felpro doesn't have it ,does this matter?felpro.jpg

  3. #78
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    I'm confused and can someone help if they can I got everything apart.my water pump cover looks like the updated one except for the square/tab part in the grove where the gasket goes , my cover has the three square tabs around the edges like the updated Cover but the inside grove has that tab where the gasket goes.should I get the cover without the groove tab or get a gasket that has the tab on it?

    20140225_212806.jpg



    20140225_212855.jpg

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    If that's the old style cover, you really shouldn't use the new style gasket. So yeah, either get the old style seal, or (the better option) get the new style cover. Looking at how the seal fits, it actually may be the correct cover. Does it move side to side or is it snug in there? Does ~ half of the seal stick out past the mating surface?

  5. #80
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    Re: 2003 STS coolant leak (possible crossover leak)?

    Anyone know when the switch over was?

  6. #81
    sts 03's Avatar
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    Also there is a slight difference between the felpro gasket and the the AC Delco.the Delco had rubber around the holes where the bolts go and it has a tab that comes off the outer edge .should I get the AC Delco gasket?

    20140226_075347.jpg

    The water pump cover gasket fits tight in the groove, it just has that tab in the groove.

    20140226_075620.jpg

  7. #82
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    The gaskets have to be in place on the crossover hanging from the bolts while you install the crossover. The little bit of rubber goes a long way towards keeping the gaskets on the bolts. I'd hate to even try the ones you have pictured.

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    Re: 2003 STS coolant leak (possible crossover leak)?

    Stick the FelPro gasket and bolts to the crossover with a tad of gasket maker RTV. Same effect as the rubber bolt retainers on OEM.

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    Ok, what about the water pump cover gasket , it fits in there there tight but it has that notch along the groove like in the pic I posted ? It's strange my pump cover has the three square tabs on the outer edge like the updated version but has that notch along the groove where the gasket goes like the old cover but the gasket does fit in tight except that notch in the groove is open?

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    Re: 2003 STS coolant leak (possible crossover leak)?

    Use it as-is. I did some snooping and couldn't find another example of that particular pump cover. The locating tab was used on the first design - your 2003 may be some sort of running design change.

    My replacement (2002) cover (tabs) uses the same black gasket that you now have. Should be good to go.

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    Thanks.

    ----------

    I know about disconnecting the engine grounds, what about if I disconnect the transmission connector would that make the harness move more and also is there a way to remove the oil dipstick tube?

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    Re: 2003 STS coolant leak (possible crossover leak)?

    You are miles ahead of the game if you can disconnect the connectors and pull that harness out of the valley between the engine and transmission, makes the job of getting the crossover manifold out and back in almost tolerable and will probably cut the job time by at least 1/3. There two types of dipsticks used on 00+ Sevilles, if the handle comes out in front of the cylinder head it has a bolt that holds the oil tube to the front of the block right under the front edge of the cam cover, If its off to the side near the water pump it is held on by a stud with a nut on the drivers side end of the block right under the water pump. Either way take the bolt or the nut off and the tube should pull right out of the hole in the block. Make sure the little o ring on the tube sealing area comes out with the tube, or fish it out before trying to put the tube back in..

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    Ok,I got the rear ground off now I need to jack the car up take the air deflector off so I can get the other ground and tranny cable undone.yeah that harness us the main problem.

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    Wow wow wow is all I can say , this is a real pita.I got the hard stuff done just got to hook the hoses back up and throttle cable up.I hope I didn't damage anything like broken wires .fingerscrossed.the plastic parts on the old crossover gaskets weren't although the one I saw that was weeping starting to deform and all the rubber parts lost there shape.for sure busted knuckles, scratched arms, lot of curse words and most of all beer .

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    Quote Originally Posted by sts 03
    Wow wow wow is all I can say
    I had more to say when I got through with the job. From my thread on the subject:
    Quote Originally Posted by MoistCabbage
    AHHHHHHHHHHHHH!!!........... Ok I feel better now.

    As you may have guessed I started work on my coolant crossover today....
    Took me about 6 hours over 2 days. Wouldn't want to do it again for less than $100 an hour.

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