97 ETC Head Gasket Project - Page 2
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Northstar Engines and System Technical Discussion Discussion, 97 ETC Head Gasket Project in Cadillac Engine Technical Discussion; Great reference pics, thanks...
  1. #16
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Great reference pics, thanks

  2. #17
    daveyhouse is offline Cadillac Owners Fanatic
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    Re: 97 ETC Head Gasket Project

    updates?

  3. #18
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Hey Davey,

    Got the rear heads off today.....bolts came out pretty smooth, i'll post pics of them later. Here a pic of the rear gasket....let me know what you think
    Attached Images

  4. #19
    Submariner409's Avatar
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    Re: 97 ETC Head Gasket Project

    Looks like every other used head gasket on earth - and those steam holes are clear and open - not always the case in Northstar gaskets. (Yes, the tiny little holes are called "steam holes".) The 3 oblong holes are the cam area drains to the pan. Not a lot of hole area for coolant transfer from the block to the heads, is there ?

    A bit of sleuthing will uncover the portion that was (?) leaking coolant into one or more cylinders.

  5. #20
    Manic Mechanic is offline Cadillac Owners Fanatic
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    Re: 97 ETC Head Gasket Project

    Did any of the head bolts have pulled threads or excessive corrosion on them?

    Vernon

  6. #21
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    Re: 97 ETC Head Gasket Project

    Quote Originally Posted by Eldorado_RED View Post
    bolts came out pretty smooth, i'll post pics of them later.
    This ^^^

  7. #22
    daveyhouse is offline Cadillac Owners Fanatic
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    Re: 97 ETC Head Gasket Project

    First post mentioned it sat for 4 years. It was the starter that busted. Hopefully he didn't have a leak and it sat for four years. That cylinder wall might be pretty rough if it did.
    Don't forget to check your wear items on your timing chains.
    Also check the lifter buckets for scuffing. Once that starts the cams don't last much longer. There some pics that I took of lifter damage here http://www.cadillacforums.com/forums...r-build-5.html

    How many miles are on this motor?

  8. #23
    stoveguyy is offline Cadillac Owners Connoisseur
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    A close up pic of the area between cylinders might show more

  9. #24
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    Re: 97 ETC Head Gasket Project

    Eldorado Reds motor came apart in my opinion just a little too easy.

    Someone had done head gaskets on it previously before. The bolts came out for the most part clean, no slivers of aluminum. The head gaskets looked damn near new. Cylinder number 2, had a "steam" bath. The piston is damn near spotless. Cylinder number 8, the bolt came loose like it was finger tight. The bolt came out of the hole oil soaked. The motor seemed to be seeping oil from under the head in that area. Further analysis will tell more soon.

    I haven't removed the gaskets from the deck yet, to keep debris from finding it's why in there untill I clean the deck surfaces.

    The 98 sts donor motor that I disassembled for my 98 eldorado gave hell to take the headbolts loose. Everytime one broke loose, I thought I had broken my breaker bar. The distinct "snap" that was heard, I'll never forget.

    This motor didn't put up too much of a fight.

    A few lifter buckets look like they'll needs swapping on the exhaust cams, the intakes were good.

    Timing chain componets looked like they had been serviced also. The guides almost showed very little wear.

    Nonetheless, we forge ahead....

  10. #25
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    here are the bolts from the rear head.....and also the front head/bolts
    Attached Images

  11. #26
    daveyhouse is offline Cadillac Owners Fanatic
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    Re: 97 ETC Head Gasket Project

    Quote Originally Posted by 98eldo32v View Post
    Cylinder number 2, had a "steam" bath.
    wonder what the condition of the oxy sensor on that bank might be because of that.

  12. #27
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Quote Originally Posted by daveyhouse View Post
    wonder what the condition of the oxy sensor on that bank might be because of that.
    will check on that davey

  13. #28
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Ok guys,

    Looks like we found the reason there was so much oil on the headbolt on the left head, cylinder 8, bottom right corner......there is a small hole on the top right corner that showed up after we drilled with the 17/32 bit.........let me know your thoughts


  14. #29
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    Re: 97 ETC Head Gasket Project

    A few years ago there was a long thread in here by AJXTCMAN - with many pictures: The thread showed one of the problems that plagues pre-2000 Northstar blocks - casting porosities. Some of the pictures show large cavities in the bottom and sides of several block head bolt holes. The metallurgy and casting process changed for the 2000 model year and later.

    Take some time and go through the threads in the sticky thread ^^^ "Root cause of ........................"

  15. #30
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Thanks Submariner409....will look into it

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