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Old 09-18-2007, 01:54 PM
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Carb Cleaning Solvent?

Hi Guys,

My son's truck needs a carb on it and I dug up an old Qadrajet for it. The QJ has been setting for years and I don't know why it was originally taken off (it was over at my father's garage and he's passed on now so I can't ask him) sooo I'm sure a carb kit is in order.

I think I'll take the plunge and try to rebuild it myself and I have a couple questions . . .

*) Carb kits - are they all the same or are some better than others? i.e. we have Autozone, O'reilly, and NAPA in town - which would have the best kit, or should I order one off the net, if so from where?

*) Carb cleaning solvent - what's the best stuff to use?

Thanks!

Steve

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Old 09-18-2007, 02:47 PM
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carb cleaner

I use a cleaner called B 12 ,it comes in spray and in a gallon can for soaking parts. it is the best I have used.
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Old 09-18-2007, 03:11 PM
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Quote:
Originally Posted by mixer4
I use a cleaner called B 12 ,it comes in spray and in a gallon can for soaking parts. it is the best I have used.
Where do you get it from?
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Old 09-18-2007, 04:56 PM
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I get the B-12 (some places callled chemtool or gunk) in gallon containers at the local parts store. It has a basket in it so you can soak parts.

On the passenger side of the carb there should be some numbers stamped into the QJ. They should start with 170 or 70. Post those numbers and we can decode it for you. Might not be worth your while if it came from a 455 and you want to put it on a 305. Its very doable, but you will probably need jets, metering rods, secondary step up cam, and maybe some other stuff.

it might just be worth it to rebuild the one on the truck. Keep in mind, carbs don't go "bad' unless they have a crack, excessively worn throttle shafts, or are missing parts. If its not running right, its a physical setting, not because the carb is old and worn out. You might have just as many or more troubles tuning the Qjet.
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Old 09-18-2007, 05:12 PM
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I don't have the carb handy right now, but it's off of a '69 Chevy 350 (I think it's 7029202 if I recall correctly). I just ordered a carb kit for it from Napa today, should be in tomorrow.

The carb on it is a two barrel and it's got a warped flange on it (they only used TWO mounting bolts on those! In what world was that ever OK?). Yeah, we could have it milled back to square, but what fun would that be?

Gunk is a common brand around here, I'm sure I'll be able to dig some up.

Thanks!

Steve
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Old 09-18-2007, 06:04 PM
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I have used the Berryman parts cleaner from autozone and other parts stores with not too much luck. Yes it cleans the grease off but it does a poor job at really cleaning carbs. I have let carbs so for as much as a week and still need a tough bristle brush to knock the hard crud off. My dad prefers to let parts so in diesel fuel. I have yet to try this but he swears by it.

When working with Holley carbs, USE ONLY HOLLEY GASKETS!!! Not all gasket are created equal when dealing with Holleys. For carter, qjet, autolite carbs, I have no clue about gaskets. I would assume they are replacements so basic kits will work.
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Old 09-18-2007, 07:39 PM
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The other day I read a post where a guy recommended acetone. Any thoughts on that anybody?

Danny
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Old 09-18-2007, 07:47 PM
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Do not buy any carb cleaner made by Gunk, it's been made politically correct and does not clean worth a flip. Berrymans is the best, either in the spray cans or better still the gallon can for immersion.

If that is an early QJ you may need to seal the main jet wells as that was a problem with earlier QJ's

Vince
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Old 09-18-2007, 07:49 PM
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Quote:
Originally Posted by Kampr
The other day I read a post where a guy recommended acetone. Any thoughts on that anybody?

Danny
Not a very good carb cleaner in my opinion.

Vince
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Old 09-18-2007, 08:13 PM
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I have used all kinds of chemicals but the best and the cheapest I ever found is regular lacquer thinner, no need for a long soak, just use a small brush (1 inch) and a plastic pan, if your hands are delicate use gloves, must use goggles also, it hurts when it lands in your eyes.

Augusto.
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Old 09-18-2007, 10:37 PM
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Quote:
Originally Posted by Augusto
I have used all kinds of chemicals but the best and the cheapest I ever found is regular lacquer thinner, no need for a long soak, just use a small brush (1 inch) and a plastic pan, if your hands are delicate use gloves, must use goggles also, it hurts when it lands in your eyes.

Augusto.
Hmmm, I actually have some lacquer thinner on hand, I think I'll give that a shot - thanks Augusto!

BTW, you're an honest man . . . "must use goggles also, it hurts when it lands in your eyes." . . . I would've said "I've heard it hurts when it lands in your eyes"!
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Old 09-19-2007, 07:10 AM
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Quote:
Originally Posted by Kampr
The other day I read a post where a guy recommended acetone. Any thoughts on that anybody?

Danny
If you read the ingredients in the( B-12, Berrymans cleaner) It is almost all acetone or atleast a high content of acetone.

I dont know about soaking a carb to clean it inthis stuff.I do know that if your car runs like crap in a can due to a stuck float or the needle valve sticking you can put it in your tank and it will free it up.
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Old 09-19-2007, 05:29 PM
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I am not saying it is the best thing out there but, Berryman chem dip parts/carb cleaner works great! Let it soak at least an hour and rinse with pressurized water. It has allways totally removed all gunk and left parts looking like new except for some occasional staining on the metal.

The stuff does get weaker as more carbs/parts are cleaned.

Last edited by GMC boogie; 09-19-2007 at 05:36 PM.
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Old 09-19-2007, 06:56 PM
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Hi Guys,

I have a jug of a generic lacquer thinner that I bought at the local hardware store in the garage, I forgot to write down the exact name brand but I'm cheap so it was the cheap generic brand. When I looked today I found the MSDS was attached to the back of the jug in a plastic fold out thingie and I did write it's ingredients down . . .

Lacquer Thinner
Toluene 45-55%
Methanol 20-25
Acetone 10-15
MEK 8-10

Doing a search for MSDS sheets tonight though I find that "Lacquer Thinner" is a more or less generic name for many chemical mixes - there doesn't seem to be any real standard formula or chemical constituants for what is called lacquer thinner . . . I guess if it'll thin lacquer then it can be called lacquer thinner!

I did a little MSDS surfing tonight though and found these:

B-12 Carburetor & Choke Cleaner
This is the spray can stuff.
Toluene 40-50%
Methanol 20-30
Acetone 20-30
MEK 1-5
2-Butoxyethanol 1-5
Isopropanol 1-5
Mixed Xylenes 1-5

B-9 Chem Dip
This is listed on their site under solvents and they specifically say it's for carb cleaning.
Methylene Chloride 55-65%
Cresols Mixture 10-15
Mixed Xylenes 20-30
Sodium Bichromate <4
Ethyl Benzene <6

Carb Medic
Dichloromethane 40-70%
Toluene 15-40
Xylene 15-40
Ethylbenzene 1-5

SynPower Carb & Choke Cleaner
A fair amount of Acetone here!
ACETONE 50-60%
METHANOL 20-30
XYLENE 15-20
ETHYL BENZENE 1-5
CYCLOHEXANONE 1-5

Hmmm, it seems that Toluene is a maint constituant, as is Acetone, Methanol, and Xylene. Pretty much paint thinner with some alcohol in it I think. I know Acetone is hygroscopic - it'll pull moisture in from the atmosphere so I imagine the alcohol is in there to help keep the water dispersed.

I'm thinking my lacquer thinner will work fine . . . I'll post back how it does.

Take Care,

Steve
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Old 09-19-2007, 07:08 PM
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mmm I wonder what hydrochloric acid would do to the zinc?.....mmm may need to experiment and see what kind of finish it leaves.
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