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#1 |
Oilfield Trash
Join Date: Sep 2003
Location: Raymore, Sk, Canada, Earth
Posts: 3,171
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Honestly, How hard is it to rebuild a Q-Jet
For some reason the q-jet carb on my 70 decided to start leaking from a bunch of different places, thinkin about rebuiding it myself, how hard is it really? I can rebuild an auto transmission i must be ble to do a carb job.
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14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr. |
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#2 |
Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,685
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Re: Honestly, How hard is it to rebuild a Q-Jet
Just as easy as an old Holley, and a helluva lot easier than an auto tranny! About the only "specialty" tool you will need is a small punch to drive the pin out of the accelerator pump arm on the top cover. Everything else is pretty straight forward.
If the idle mixture screws are not visable, you will want to remove the plugs to gain access to them. There are a number of ways to get them out. I usually drill a small hole (I have a drill bit for this with a wood block as a stop so I dont drill into the mixture screws), then use a tiny little slide hammer looking tool I made to pop the plugs out.
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 05-31-2006 at 03:42 PM. |
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#3 |
67 is sold
Join Date: Apr 2001
Location: Troy, Michigan
Posts: 6,738
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Re: Honestly, How hard is it to rebuild a Q-Jet
Just have the proper tools and don't lose any parts
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#4 |
Registered User
Join Date: Apr 2004
Location: South Texas....the Valley
Posts: 199
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Re: Honestly, How hard is it to rebuild a Q-Jet
I've done a few ! Honestly the most important part is to get a QUALITY KIT. I've had more trouble with cheap kits than the rebuild itself. Honestly, they are not that tough and there is LOTS of good reference on the internet with good quality pictures.
Best of luck....I'm sure we'll all lend you support and advice here should you need it. Better yet, send me the carb and I'll send you my trans.....we'll trade builds ! ! |
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#5 | |
Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Re: Honestly, How hard is it to rebuild a Q-Jet
Quote:
1. How to recognize a "cheap kit"? 2. How to recognize a "Quality kit"? 3. What brands to avoid? 4. What brands to seek out? TIA. ![]()
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 06-03-2006 at 03:22 AM. |
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#6 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Honestly, How hard is it to rebuild a Q-Jet
The "funnist" part is getting the little choke rod lever inside the carb to line up with the outside parts. Have rebuilt 100's of them over the years. (71 years young)
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#7 | |
DON'T TREAD ON ME
![]() Join Date: May 2005
Location: Crosby County, TX
Posts: 989
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Re: Honestly, How hard is it to rebuild a Q-Jet
Quote:
I've rebuilt them numerous times, they aren't that bad. There is an area under the fuel bowl that is prone to leak gas down into the intake. If your's looks like it's been leaking you may need to put some JB Weld over it to seal it up. I always clear off a nice area on my work bench and put an old towl or t-shirt down to keep stuff from rolling around.
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Old Yeller |
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#8 |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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it's always best to look at the instructions for part details on any carb rebuild
most carbs i have taken apart were missing a part somewhere. you know what i mean!!! like one little ball check in a trans missing and it won't shift. i just bought a rebuilt q-jet at autozone for 129.00 if you buy a new choke pulloff and a carb kit. you will have about half that spent already.. ![]() |
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#9 |
Registered User
Join Date: Apr 2006
Location: oklahoma
Posts: 10,670
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Re: Honestly, How hard is it to rebuild a Q-Jet
Ihad 3 shops rebuild my quadrajet and every time after about a year the carb would start acting up and need rebuilt. After wasting all that money on shops I said fine i will try it myself. That was my first carb rebuild and 4 years latter no trouble. I guess the old sain " If you want it done right do it your self" applys. I thought it was easy. Hope this helps.
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#10 |
Oilfield Trash
Join Date: Sep 2003
Location: Raymore, Sk, Canada, Earth
Posts: 3,171
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Re: Honestly, How hard is it to rebuild a Q-Jet
well gonna start tearing into it tonight see how it goes mabye i'll really take my time and do an FAQ post on it, thanks for the support guys!
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14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr. |
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#11 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: Honestly, How hard is it to rebuild a Q-Jet
Anyone can throw a kit at a q-jet, but it takes more. Biggest problem is throttle body wear at the shaft. Best checked with a dial indicator. Factory spec is .004-.006 inch, but rebuilders are supposed to have a breaking point of .009. That means that if the is 10 thousandths of an inch movement perpindicular to the throttle shaft, the shaft needs bushed. That means reaming the hole, pressing a bushing, and reaming the bushing. Not that hard if you have the right tools.
Another area is plug sealing. There are some epoxy plugs in the bowl, if they leak they need sealed. Best thing is POR-15. It doesn't take much, and has to cure if used. Also, the horn has a tendency to warp. Not as bad with the q-jet as the ones. Fixing involves making a jig to clamp down the warped area. Do not try to take out more than .003 at a time, baking at 400* for an hour. Then let it cool, check and repeat until warpage is gone. Problem is this is only a temporary fix. When I turned wrenches over 30 years ago, I threw kits in a lot of q-jets. But I didn't know what it took to properly rebuild one. For the average shade-tree, I recommend finding a shop that knows how to rebuild and tune them.
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#12 |
Registered User
Join Date: Apr 2006
Location: oklahoma
Posts: 10,670
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Re: Honestly, How hard is it to rebuild a Q-Jet
The worst thing I have seen is really tore up and /or melted venturis. I have a small stock pile I use for parts. Everyone I knew was chunking them and repalcing them with afbs or holleys so I said I will take them off your hands. Now I have enough to keep my trucks happy for years. I swear some people use a sledge on the venturies! good luck.
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#13 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Honestly, How hard is it to rebuild a Q-Jet
Here's a website with pictures on a q-jet rebuild.
http://www.4wheelnoffroad.com/qjet.html
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#14 |
8 vehicles only 4 that run
![]() Join Date: Feb 2006
Location: Clemson, SC
Posts: 236
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Re: Honestly, How hard is it to rebuild a Q-Jet
Check out this link for a page on rebuilding Qjets. All you "seasoned" Qjet rebuilders can check its correctness and reply here. Not my site, just found it on the web.
http://www.4wheelnoffroad.com/qjet.html
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95 2500 350 w/ 3.73 ![]() 72 GMC 1500 SWB stepside 65 Chevy C10 SWB stepside 72 Chevy C10 LWB fleetside |
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#15 |
Registered User
Join Date: Jun 2004
Posts: 17
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Re: Honestly, How hard is it to rebuild a Q-Jet
dont forget to get a new float
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#16 |
Oilfield Trash
Join Date: Sep 2003
Location: Raymore, Sk, Canada, Earth
Posts: 3,171
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Re: Honestly, How hard is it to rebuild a Q-Jet
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__________________
14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr. |
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#17 |
Oilfield Trash
Join Date: Sep 2003
Location: Raymore, Sk, Canada, Earth
Posts: 3,171
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Re: Honestly, How hard is it to rebuild a Q-Jet
I just went down to the local NAPA and bought thier brand kit, the partsman is a good friend of mine and has been working there for like 15 years, so i knew he wouldnt steer me wrong.
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14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr. |
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#18 |
Registered User
Join Date: Apr 2004
Location: South Texas....the Valley
Posts: 199
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Re: Honestly, How hard is it to rebuild a Q-Jet
Blue85:
EXACTLY, I typically use the NAPA kits. Lots of the "cheaper" kits from Autozone, or other "National - Discount" chains are in the not-so-good category and have parts in them for lots and lots of different models. Look for kits where the gaskets are cut sharply and cleanly. Many are punched from old dies which merely "smash" the material rather than really cut it. On plastic molded parts or rubber parts, make sure they don't have flash all over them. Last edited by sdmahr; 06-03-2006 at 05:39 PM. |
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#19 |
Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Re: Honestly, How hard is it to rebuild a Q-Jet
Blue85 & sdmahr,
A belated thanks for the info on quality Q-Jet rebuild kits. ![]()
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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