Author Topic: Q-Jet help  (Read 2185 times)

1969Z27

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Q-Jet help
« on: February 01, 2016, 12:36:04 AM »
Throttle shaft seized. Soaked in carb cleaner for couple months. Still froze up. Would soaking in transmission fluid help??
Russ 
68 RS L22/M20
69 SS L48/MC1

ko-lek-tor

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Re: Q-Jet help
« Reply #1 on: February 01, 2016, 12:56:36 AM »
Acetone (good nail polish remover)mixed 50-50 with trans fluid. Warm the pivot points with a propane torch. Careful with the torch as not to melt any plastic bushings or catching solvents on fire. Also, do not heat the spring that returns the throttle on the shaft. I would put the throttle plate in a vise. Use a vise grip clamped to the linkage throttle lever end and use it as a fulcrum to work shaft back and forth.
James to strangers, Bentley to friends
1969 SS/RS 396 coupe Hugger Orange X22 712 bought in 79
1969 SS 350 coupe LeMans Blue 713 bought in 79
1969 307 4spd. coupe Daytona Yellow 711 bought in 85

Mike S

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Re: Q-Jet help
« Reply #2 on: February 01, 2016, 02:45:10 AM »
Acetone (good nail polish remover)mixed 50-50 with trans fluid. ......
Ah-ha! Someone else knows this secret formula  ;)
This mixture works sooooo much better compared to Liquid Wrench.

Mike 
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

1969Z27

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Re: Q-Jet help
« Reply #3 on: February 01, 2016, 08:57:32 PM »
Thanks for the info.
Russ 
68 RS L22/M20
69 SS L48/MC1

z28z11

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Re: Q-Jet help
« Reply #4 on: February 02, 2016, 02:16:29 AM »
Good shot of PB Blaster or Kroil will do it. Either one of those are my chemicals of choice when it comes to loosening plugs from exhaust manifolds. If you've ever tried that, you'll know how seized they get. A few applications of PB (which gets into millionths-of-an-inch openings) usually does the trick -

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Steve
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

KurtS

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Re: Q-Jet help
« Reply #5 on: May 03, 2016, 03:02:35 AM »
I have a frozen Q-jet too.
I heated it up with a heat gun and put the trans oil / acetone mix at the shaft / throttle body interface. Multiple times. I can feel the throttle shaft twisting - I'm afraid it may shear off. At this point I think I have to take the throttle plates off and press out the shaft unless someone has any other ideas.
The secondary shaft is locked up too - it's a lot harder to get a grip on to even try to rotate.
Kurt S
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bcmiller

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Re: Q-Jet help
« Reply #6 on: May 03, 2016, 03:32:44 AM »
I have never tried PB Blaster on a carb but that is GOOD stuff on other things that are seized. 

I am pretty surprised that a soaking in carb cleaner for a few months didn't help. Was it fresh?
Bryon / 1968 Camaro SS 396 - now 468 ci, M21, 12 bolt
Looking for 68 Camaro with body number NOR 181016

Mike S

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Re: Q-Jet help
« Reply #7 on: May 03, 2016, 03:49:33 AM »
 I haven't tried it myself but I heard Marvel Mystery Oil can be used to remove aluminum oxide buildup which is probably what is locking the throttle shaft. Maybe soaking it in that will help. I'd certainly try it if it were mine.

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

mikefam

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Re: Q-Jet help
« Reply #8 on: May 24, 2016, 12:34:18 PM »
I would remove the base from the carb and soak it in a can of Gunk carb parts cleaner.

Mike.
68 Convertible w/327 275hp donor engine from a 67 Impala and TH350

bcmiller

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Re: Q-Jet help
« Reply #9 on: July 18, 2016, 04:01:14 AM »
Any updates on this?
Bryon / 1968 Camaro SS 396 - now 468 ci, M21, 12 bolt
Looking for 68 Camaro with body number NOR 181016

cook_dw

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Re: Q-Jet help
« Reply #10 on: July 18, 2016, 12:03:04 PM »
Here's a little tip and do this at your own risk as I am not held responsible if you break your down stuff..      ;)

It works with 2 different metals like steel and aluminum have fused together..  Heat up with a propane torch then pour cold water over it.  Repeat several times and eventually they will free up..  It is essentially expanding and contracting the metals to break the bond the 2 differing metals have made.  Do this with caution as if they are fragile parts or near fragile parts then be very careful.
Darrell Cook

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1969Z27

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Re: Q-Jet help
« Reply #11 on: July 18, 2016, 07:43:46 PM »
Sorry I keep forgetting to purchase some acetone. I'm putting it on my get r done list. The carb I'm working on is the factory born q jet from a friend's 73 Z/28. Also need to purchase small torch.
Russ 
68 RS L22/M20
69 SS L48/MC1