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1st Q-Jet Rebuild... nervous!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by beefcake83, Dec 2, 2001.

  1. beefcake83

    beefcake83 1/2 ton status

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    Well tomorrow I'm going to go into unfamiliar teritory and will try to rebuild my Q-Jet carb. I'm antimidated to say the least. Way too many little parts and adjustments. Any things that I should know? Things to do, or not do? As soon as it's running again, the for sale sign goes into the window :(

    Gary Graham
    '83 GMC Jimmy w/ '94 350 'Beefcake'
    Eielson AFB, Alaska
    Metallica & Mountain Dew
    http://community.webshots.com/user/beefcake83
     
  2. Blazer79

    Blazer79 1/2 ton status

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    The most important aspect of rebuilding a Q-jet is order. Work in a clean area, watch where everything comes from and put it where you wont drop it or mix it with other similar parts.

    It would be great if you had the Rochester Carburetors book from HP Books.

    If you run into any trouble, just ask. Good luck.

    <font color=purple>//////
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  3. beefcake83

    beefcake83 1/2 ton status

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    Yeah, I wish I had it too. Wonder if they have a copy at the library? Someone told me to just take my time, that it comes apart in layers, and to not turn it upside down once I've started disassembling (small BB like balls in hidden crevises and stuff). I think the trouble I'm having is with the float this time. Last time was the elec choke element.

    Gary Graham
    '83 GMC Jimmy w/ '94 350 'Beefcake'
    Eielson AFB, Alaska
    Metallica & Mountain Dew
    http://community.webshots.com/user/beefcake83
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Who knows...maybe it'll run so good when you're done you won't wanna sell it. [​IMG]

    Mostly the rebuild is not much more than new gaskets, cleaning, and checking and possibly re-setting the float level. There really isn't much that goes wrong with them, mostly varinsh and stuff that clog stuff up and make other parts sticky. I'd check the library for the book on Q-jets...written by Doug Roe. If not the library check the parts place you got the rebuild kit at. The parts store here had a book section and I found a copy there.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
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  5. Burbinator

    Burbinator 1/2 ton status

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    I had the same reservations as you do when I rebuilt my first Q-Jet on my old '82 Burb. It's not that bad.

    As stated previously, an organized work space is key. I used a card table and kept my boys FAR away from it. Another useful point is to try and do all the work in one sitting so your memory doesn't purge any details. Pay attention to the gaskets, as the kit for mine had a couple different gaskets with slight variations. The trickiest part I found was getting the primary metering rods to seat correctly while reassembling; pay close attention to how it comes apart.

    As for the book ("Rochester Carburetors" by Doug Roe), I found a copy at my local library. I have since purchased one of my own.

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://community.webshots.com/user/abshort>U.S.S. Nimitz II</a>
     
  6. beefcake83

    beefcake83 1/2 ton status

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    Hey guys, thanks for the replies... one question - about how long do you think it'll take me to do the rebuild? I hope to get it finished tomorrow. It's in a auto shop that's open from 10:30 until 3:30. - G

    Gary Graham
    '83 GMC Jimmy w/ '94 350 'Beefcake'
    Eielson AFB, Alaska
    Metallica & Mountain Dew
    http://community.webshots.com/user/beefcake83
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I'd count on at least a couple of hours...when I do something unfamiliar I hate to try and rush. One thing to check before getting too carried away is the throttle shaft bushings. The actual shaft should not have any 'play' in it up or down. If there is play in it the shaft bores will need to be re-bushed. Bad throttle shaft causes all sorts of weird tuning frustrations as the carb is sucking in extra air through the worn shafts. This is a relatively common thing with Q-jets...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  8. should only take a couple hours. some guys like to soak all the pieces in a bucket of carb cleaner overnight (don't put any parts with rubber seals or gaskets in there though). i just used spray carb cleaner and compressed air to clean out all the passages. if i remember right the only new pieces you get, aside from gaskets, are a new float valve and accellerator pump. kit should be around 20 bucks. the biggest pain i thought was dissconnecting and reconnecting all the linkages. still not too hard though. good luck![​IMG]

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  9. eds77k5

    eds77k5 1/2 ton status

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    try <a target="_blank" href=http://vetteworks.tripod.com/Qjet.htm>http://vetteworks.tripod.com/Qjet.htm</a>

    "growin old is not for sissies"
    77k5 400/350/np203/stock for now
     
  10. 79Jimmy

    79Jimmy 1/2 ton status

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    I have to agree with Rene (as unual). The throttle body (bottom) section should be rebushed. It can be quite difficult to fine tune the idle circuit if its cheating air at the throttle shaft. If the rpm if above 1500 with the ckoke on its probably getting too much air with the extra gas.

    James

    jimmy79@shaw.ca
     

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