Hello, everyone. I'd like you to meet Rocky.

Rocky is a mess right now.  In fact he's gone all to pieces.  But during better times, he did the job of metering fuel into the 350 c.i. engine in my '85 Chevy truck.  We're going to get him cleaned up and pulled together with some new pieces that should give him a whole new perspective on life.  Then we're going to put him right back to work and see how he does.  I hope you all will join me in wishing Rocky well.

Thank you.

Am I the only one that was hoping for Daihatsu content?

In reply to m4ff3w :

I wanted a moose and squirrel!

In reply to m4ff3w :

I came here to say this. 

This is not the Daihatsu 4x4 I was expecting. 

Looks like an 800.  Best of the best.  Late model, but not electric.

Qjet fanboi here.

Ah, Curtis.  Good to see a discriminating connoisseur of big, beefy carburetors and not another quirky little miniature Jeep fan.

Dusterbd13-michael (Forum Supporter) said:

In reply to m4ff3w :

I want moose and squirrel!

FTFY

Owned many Qjet equipped cars and trucks. Rebuilt many carbs over the years. Qjet was one of my favorites.

Came here expecting Daihatsu Rocky. Can't believe I fell for this Charade.

Was not sure where this title would go. Like this much better than the other options. 
Add me to Quadra-bog fanboi list!

In reply to codrus (Forum Supporter) :

Meatloaf for dinner, again?

1988RedT2 said:

Ah, Curtis.  Good to see a discriminating connoisseur of big, beefy carburetors and not another quirky little miniature Jeep fan.

Just my preference, but I think vehicle brands should have no more than two syllables.  Ford.  Chevy.  Jaguar.  Daihatsu just doesn't roll off the tongue quite right.

I used to take every Qjet I had an add an adjustable primary step up adjuster.  Drill and tap the airhorn above the piston and put an allen-head set screw in it.  Then I would "blueprint" the ported vacuum by taking a micro-file and filing a tiny tapered slot below the hole in the throat.  That was a lot of on-off-on-off, but I felt like I was improving it.

Jeez.  It's been 20 years since I built a custom Qjet.  I gotta get back into it.

Dusterbd13-michael (Forum Supporter) said:

In reply to m4ff3w :

I wanted a moose and squirrel!

I was thinking about my departed dog.

This reminds me that I think I have a Q jet sitting on my spare Cadillac. I shall watch and maybe learn.

I dunno how much learnin' you'll get.

All I'm doing is pulling it apart and cleaning it up.  Got a kit from Cliff's  https://cliffshighperformance.com/

Internet wisdom seems to indicate they're the best you can get.  So far, I've found some crud and some loose fasteners.  And the accelerator pump just wasn't pumping.   The truck had gotten very hard to start over the last several months.  Pretty sure she just wasn't getting enough fuel.  I'm expecting this to fix that much.  I won't hope for any significant improvement in gas mileage.

Leaky well plugs were sometimes an issue with those.  I'm in the habit of sealing them with epoxy as part of my rebuild.  Check the throttle shafts for slop.  As old as those are now it's likely that any Carb that hasn't been bushed needs it.

Putting this thing back together now.  Can Curtis or one of you other Qjet gurus shed some light on what this thing is, just above the main inlet seat in this picture, and just below the well for the main power piston?  I don't see it on my exploded view, and I'm not sure if it's supposed to be removed for cleaning, or what.

Halp! 

Hmmm.  Okay.  Found it--APT-- Adjustable Part Throttle.  I need to screw that in, count the turns required to bottom it, and remove and make sure it's clean in there.

Alright.  Here is the news for which you have been waiting.  Rocky has pulled himself together.  Cleaned himself up.  He reports for work today, perched atop the old SBC that he has called home these past 30-odd years or so, ready to dump mass quantities of dead dinosaur distillate down her thirsty throat.

I will post a summary of his job performance later today.  I'm just glad my "easy one-day job" is finished, perhaps just a little late and over budget.

Seeing a quadrajet with all of those vacuum lines is just weird to me.  I'm used to looking at the pair perched on top of the 454s in the boat, so the only vacuum line is to the choke pulloff. 

The point of that screw is to set the low position of the metering rods.  Screw it down, you let the rods sit deeper in the jet, leaning things out at part throttle.  Screw it out, raise the metering rods.  There is a removable plug in the top cover that gives access, so you can fiddle with your cruise mixture.

Edit: Or it is accesible through the vent tube in the cover.  I think it has to do with the vintage of the carb.  Or I'm full of E36 M3.

Little hint- With the amount of alcohol in modern gas, a turn or two up can really help drivability. Aand, you might think it will cost you gas, but if you have a bit richer setting, you can run with less throttle opening, and actually improve mileage.

Edit again-  I see the picture you just posted now.  The round plug just ahead of the bowl vent stack is how you get to the adjuster.  Drill a hole halfway through, screw in a sheet metal screw and pry it out with a side cutter.  

I can't believe you guys missed the boat so badly...

That truck would've had a Q-jet, btw...

Those make the best sound in the world when the secondaries flop open!