rebuilding 72 carb: is this the egr? (and advice)

[submariner409]

Haven't seen that particular interference, but is it possible to make a tubing wrench to fit.......take a proper sized box end wrench and cut one entire flat out of it. Slip the wrench opening over the tube and slide onto the nut.

[dochawk]

Originally Posted by cadillac_al

It's not a bad idea to freshen up that carb but an old mechanic told me a long time ago that " a lot of carburators get rebuilt because of poor ignition" (mostly points). It doesn't appear to be that dirty in there so it might not have been your problem. Your hands look a little too dirty for carb work in my opinion.

I'm not quite following you--every speck of grime came from the carb--and I was constantly cleaning them, if only to pick up my camera.

But even clean, the gaskets were disintegrating, both between the carb and block and within the carb. And given the other "creative" things done with this vehicle, just being sure that noone had used a piece of coathanger inside it was enough reason to open it up.

I hope your kit came with a new float needle and seat. If not, now is the time to replace them. Make sure the primary needles are/were moving freely. If you take your time and put it all back together like you took it apart everything should be fine.

I think so. But four days ago, I couldn't have told your that there were a needle and float in one of these

Oh yeah, if you really want to do a good job you should epoxy the well plugs at the bottom of the fuel bowls from the bottom side. If you search around the net for Quadrajet rebuilds you should find more info and pictures of epoxy dabbed on them. Those plugs frequently leak and make the vehicle harder to start after it has sat overnight or a couple days depending on the leakage rate.

Originally Posted by awadecki

Maybe you can help me. How did you get the fuel filter inlet nut off to remove the carb? Did you move your A/C compressor?

I didn't need to. I just unscrewed a hose clamp for the fuel line; nothing was in the way.

Originally Posted by submariner409

The hose with screw in it is probably part of a choke or accelerator return modulator hookup (or maybe part of the secondary air valve lockout mechanism).

While most of the hacked lines/wires in this thing are too tight, in that particular case the other plugged hose could actually reach. Could there be a reason *not* to reconnect it?


thanks

hawk

[Brother_B]

In case you haven't seen this link:

http://www.tocmp.com/manuals/Carbs/R...QJet/index.htm

[dochawk]

I've picked up a cheap pot from a thrift shop that can hold the cleaner.

The cleaner says that cast iron needs penetrating oil applied after cleaning to prevent rust. Is this something I should or should not be doing?

thanks

hawk

[cadillac_al]

I can't seem to find what cleaner you are using in this thread. The only carb cleaner dip that I have ever heard of is something like this stuff.

http://www.xz550.com/carbclean.html

I usually don't do this step because I'm cheap, lazy, in a hurry, all of the above. If you are using something made for carbs (aluminum) it should work fine.

[dochawk]

It was somewhere up thread, I think. Anyway, that's it.

It's what they handed me, and I had it open before I discovered the carb pieces wouldn't fit into it

With luck, I'll have time to reassemble it tonight! It seems I still need to buy the float, though.

thanks

hawk

[cadillac_al]

It sounds like they should make a wider can for four barrels; maybe 1 1/2 gal. Anyway you're doing a great job, you might as well epoxy those well plugs too after all this. Cheers.

[dochawk]

I'll be picking up my float tomorrow, but I'm having trouble getting the choke pull. Autozone could find it in their computer, but without a price or part number to order it. Pep Boys couldn't find it at all.




While disassembling further to fit in the pot to clean, I took off this part and found this screen. Is this something that I should be replacing, or just cleaning?



Finally, I seem to have a broken tab Any idea where it goes?



Possibly here?
\
hawk

[dochawk]

ack. That wasn't what I meant to do, and I don't seem to be able to edit.

Are these what I need to seal with epoxy?


(this links to the full picture)

I don't believe that there were any seals at all over these as I disassembled.

These openings are too big to jus put epoxy over. Do I use a bit of screen, or perhaps aluminum foil, to make a scaffolding or it? Or am I missing something?

While I'm at it, here are the images from the prior post as thumbnails & links:












thanks

hawk

[zonie77]

Originally Posted by dochawk

Are these what I need to seal with epoxy?

NO!

On the bottom there are some plugs that are pressed in and can come loose. Flip it over

[dochawk]

Thanks.

These, then? It seems that it may already have been done--I don't see a slot to unscrew them with.





And i I do need to do it, I think it's the 10 minute epoxy that I have on hand. Is that what I want?

Oh, and I'd forgotten that I'd made my commentary on disassembly. All of the pictures are at http://dochawk.org/column.090222.html, some with comments.

hawk, itching to reassemble it

[zonie77]

Yes, they look like they were done and one had the epoxy come off. 10 min epoxy is fine, you are keeping them from coming loose so it is not a lot of pressure. As always with epoxy make sure you clean the surfaces well.

[cadillac_al]

Well Doc, it looks like you are getting some on the job training now. That piece that broke off is the support for the accelerator pump. I have broken a couple of those in my younger days and it is a major bummer. I used to replace the whole carb after they were broken because I couldn't figure a way to fix them. Then just last year I picked up a rebuilt Quadrajet and somebody did a nice fix on it.

I haven't dared to take it apart but it appears they either used a screw with a shoulder on it or a screw with a bushing over it where the lever pivots on it. It is screwed into the the other part that isn't broken. I don't know if it's fine threaded or coarse. The more I think about it, it does look like a sheetmetal screw. It must have a bushing over it.

That filter screen is an antique. I honestly can't remember the last time I saw one like that. I would be tempted to clean it and reuse it but it probably should be replaced with an updated version. Save it anyway; I'll bet somebody would pay $10 for it on Ebay lol.

I don't think those well plugs have been touched yet. The factory put some kind of lead plugs in there and I think that's what I'm seeing on yours. Epoxy dabbed on there usually looks a little messy. Good luck.

[dochawk]

Originally Posted by cadillac_al

Well Doc, it looks like you are getting some on the job training now. That piece that broke off is the support for the accelerator pump.

Then just last year I picked up a rebuilt Quadrajet and somebody did a nice fix on it.

I haven't dared to take it apart but it appears they either used a screw with a shoulder on it or a screw with a bushing over it where the lever pivots on it. It is screwed into the the other part that isn't broken. I don't know if it's fine threaded or coarse. The more I think about it, it does look like a sheetmetal screw. It must have a bushing over it.

Could you possibly send an Image?

That filter screen is an antique. I honestly can't remember the last time I saw one like that. I would be tempted to clean it and reuse it but it probably should be replaced with an updated version. Save it anyway; I'll bet somebody would pay $10 for it on Ebay lol.

Gessler is sending one for $3, plus another $1 for the spring.

I don't think those well plugs have been touched yet. The factory put some kind of lead plugs in there and I think that's what I'm seeing on yours. Epoxy dabbed on there usually looks a little messy. Good luck.

OK, that sounds easy enough.

Oh, and apparently the carb itself is actually 1975, not a 1972

thanks

hawk

[dochawk]

I just noticed this staining last night:





It looks more like fat burned on to a pan or barbecue than anything else.

I assume that I should remove this without it falling further into the engine? But how?