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Well I found out what was wrong with my motor.

Discussion in 'The Garage' started by JDNobodi, Aug 6, 2006.

  1. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    I blew the head gaskets, and I don’t even had 10hrs on this motor.:mad:

    Link 1

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    Last edited: Aug 9, 2006
  2. 1-ton

    1-ton 1/2 ton status Premium Member

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    Use a straight edge to make sure the deck surface of the block and heads are flat. If you can stick a .010" feeler gauge any were in between the staright edge and the deck surface of the block or heads, then they need to be resurfaced.
     
  3. jeff l

    jeff l 1/2 ton status

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    what was your new moter doing, was it running bad or under powered I have a new rebuild that seems way under powered.
     
  4. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    It was running poorly, making noises, and blowing oil all over the place. The noise it made sounded like tapping sound. When I took off the valve cover, the noise sounded more like a exhause leak. I frist thought it was the exhaust cross over and changed the intake gasket. Needless to say, It wasn't the problem. I talked around to figure what could be the problem. I pulled the motor to investgate the problem further. When I pulled the heads, I found the blown head gaskets.
     
  5. jeff l

    jeff l 1/2 ton status

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    thanks I don't think I have a blown head gasket. It must be something else, mines not doing all that its just feels under powered.

    Glad you found the problem; thanks for the responce- Jeff
     
  6. JEBSR

    JEBSR 1/2 ton status

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    To push those gaskets out like that around every cylinder it looks like you have a serious detination problem. Was the timming set with a light? and if so are you sure the balancer and timming pointer are accurate?

    Oh yea hard to tell from the pics but those pistons look pretty close to to the deck, has the block been zero decked and with only one valve relief I am wondering what your actual compression ratio is. Do you know for sure??
     
  7. big dan

    big dan 1/2 ton status Premium Member

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    when I first looked at that picture I didnt notice there was a gasket on the block and thought all your cylinders were fubared. guess my eyes dont work as well at night.
     
  8. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    First off, i'll bet money on detonation is the culprit of your damage. Check the flatness as was already stated but it must not exceed .003", anything more and the heads will need to be machined. The block i highly doubt will be out at all. Once you have determined that the heads are within specs then take them to a machine shop and have them magnufluxed to check for cracks. They could likely be cracked from the detonation that was going on in them cylinders. If all checks out ok then put it back together and make triple sure the timing is set correctly or else this will all happen again.
     
  9. big94gmc

    big94gmc 1/2 ton status

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    C'mon, dude....this 'return' after each image so this thread doesn't need to be scrolled but in one direction.
     
  10. JEBSR

    JEBSR 1/2 ton status

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    Still need to know what the actual compression is as well. If it is too high he can back the timming off all he wants and it will still detonate on pump gas.
     
  11. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Those are low compression flattop truck pistons with closed chamber heads so probably around 8:1 but most people have no idea how much info is needed to compute actual compression ratio.

    If he really wants to figure it out he'll need to know piston deck height or cc's from piston head to deck surface, bore diameter or swept volume cc's, compressed gasket thickness or cc's, cylinder head chamber volume cc's.
     
  12. 1-ton

    1-ton 1/2 ton status Premium Member

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    You can do get away with .010" if you are doing a cheap slap together job out of parts laying around. I have done it before without a problem (I used copper seal to go with it), but if you want the job done right, then yes .003" is the measurment you should shoot for.
     
  13. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    Sorry it took to long to reply. I got home late the other night then went to work early tonight.

    Anyway, I was told the compression ratio would be about 10 to 1. The motor is bored and stroked to 496ci. The longer stroke boosted the compression ratio which normally would be 8 to 1 on a 454. When my bother was buying parts, he was aiming to build a strong street/tow motor. He gave up on his project, and I bought the motor off him.

    I probably did have the timing too high because my timing light was giving me fits.

    You must assume I’m computer literate to understand what I suppose to with a computer besides surfing for porn.
     
  14. surpip

    surpip 1 ton status

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    fix your pictures

    please
    now
     
  15. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    What exactly is happening? When I view my pictures, they stay in my frist post. Are the pictures doing something funky to you guys?

    (EDIT) I've linked the pictures now. I hope My Gallery doesn't have the same problems.
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    What you need to do is go to your gallery, right click the picture you want to post, click properties, then copy the entire address. (it looks like this for one of yours: http://coloradok5.com/photos/data/500/Head_Gasket.jpg )

    Go back to your post, click the yellow square with a mountain image on it right above where you type in your message, and when it asks for the address, paste the address you previously copied in there, (like the one above) and the picture will now show up directly in the post.

    If there is a faster/easier way, I'm unaware of it.
     
  17. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    Thats what I did the frist time. Expect I tried to back and edit my post by trying to add a space between the pictures.
     
  18. surpip

    surpip 1 ton status

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    you just press enter after every picture, so the go down instead of across
     
  19. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    Better now?
     

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