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I decided to rebuild my 442 Carb today. Carb P/N is 7029253 which I believe is original to my 69 442 with 400 CI engine and 4 speed. I was having very hard starting after setting a few days.
and very poor fuel milage (6.9 around town). Where are the "well plugs" that others have mentioned that may leak?
I'm working off the CSM and rebuild kit instructions.
I have replaced and adjusted the needle and seat to 1/4 inch drop (or rise depending how you look at it)of the float per the instruction sheet. Also replaced the pump plunger. All that has gone with no issues. I also have blown out all passages with nothing found obstructing.
I cannot locate any readable numbers on either the primary or secondary metering rods. Is there any other way(besides numbers) to insure the both sets or metering rods are correct for this carb.
Another issue I found when I removed carb from engine, I found that the 1 inch spacer below carb was full of fuel under the front barrels below the gasket. Is that normal? had aprox 1/4 inch of fuel. That's enough questions for now but I'm sure I'll have more later.
Thanks for any replies
Thanks so much Joe for the pic.
I will have to order a float if I'm going to replace it.
What I did was submerge.it i fuel for several hours then removed weight I was using to weight it down in fuel and it immediately floated to top of pan. I then removed it and it had absolutely no fuel in it. I hope that is good enough but I you have a P/N available and a source to purchase a brass float please let me know
I think I found the numbers on the secondary metering rods the larger of the 2 sets 72 on both and 45B on the primarys (smaller of the rods)
I also have 72 as the primary jets. I'm now thinking that I have the primary and secondary rods mixed up in my mind
The secondary metering well plugs that leak on Q-jets are big plugs in the central protrusion on the bottom of the bowl.
To stop them from leaking, grind off the peen-over, drive them out through the secondary discharge passages in the top of the bowl (NOT through the secondary jets) using a 1/8" or smaller steel rod about 4" long and replace them with these: http://quadrajetparts.com/secondary-...lug-p-122.html
To stop them from leaking, grind off the peen-over, drive them out through the secondary discharge passages in the top of the bowl (NOT through the secondary jets) using a 1/8" or smaller steel rod about 4" long and replace them with these:...
Whoa whoa whoa whoa whoa.
Before you replace them, make sure they are actually leaking.
Use gasoline, acetone, or whatever, fill the float bowls, and let the float bowl segment sit above a paper towel or something and see whether anything drips from the plugs.
An easy test can save you from a lot of extra work, and the '69s are not prone to leakage.
Okay. That's not what I've observed, and new plugs are not included with the rebuild kit he's got.
Why go telling the guy to replace the plugs before he knows they're leaking?
It's easy enough to test, and if he doesn't need to do it, it'll save him time and money.
- Eric
X2. The leaking well plug phenomena is grossly overrated. In four decades of rebuilding Qjets, I've NEVER seen this on the 1968-newer Qjets with the spun-in thick aluminum plugs. It was a problem on the very early Qjets with the thin cup plugs. Ever since Doug Roe wrote about it, everyone thinks this is the first thing they need to fix on a Qjet. It isn't. As Eric points out, residual fuel in pockets like that is normal, based mainly on reversion in the intake. If you really think the well plugs are leaking, fill the float bowl and let the carb sit on the bench overnight. If it's dry underneath, there's no leakage.
As suggested I filled the float bowl with fuel this morning and will let it sit on a paper shop towel today. No leak noted after maybe 30 min. Should I let it sit longer before I continue the complete reassembly?
As Kenneth (Fun71) posted I have found that the metering rods may possible be mismatched as the Letters on them do not match each other. On one rod I find the letters CP clearly stamped and the other has a poorly stamped CR stamped.
Can anyone tell me if this is an issue where I need to replace the metering rods.
As suggested I filled the float bowl with fuel this morning and will let it sit on a paper shop towel today. No leak noted after maybe 30 min. Should I let it sit longer before I continue the complete reassembly?
As Kenneth (Fun71) posted I have found that the metering rods may possible be mismatched as the Letters on them do not match each other. On one rod I find the letters CP clearly stamped and the other has a poorly stamped CR stamped.
Can anyone tell me if this is an issue where I need to replace the metering rods.
Thanks for the links Joe
looks to me like the secondary metering rods need replaced as there is no doubt that they are marked differently. Although I did mic the rods as being the same at 3 different points of measurement. .0552 at tip: .1293 slightly above tip and .01496 at main barrel.
To satisfy my concern I want to replace the rods.
Can you suggest which rods to purchase and possibly a supplier for these? CP or CR or some other metering rods
Be aware that the number of different rods available new is limited. Rochester had nearly an infinite number to precisely tune the carb to each application. The rods available today cover about 90% of all possible combinations, but won't be EXACTLY the same.
Joe once again thank you.
Would you or Kenneth (Fun71) please recommend which jets I should purchase. The selections are all Greek to me. Basically stock 400 eng. 4 speed with HEI ignition. Cam is TRW with.474 lift, 321 duration & 95*overlap intake & exh. Centers 112* intake & 114* Exh.
Carb has 72 jets.
Fuel has been sitting in the bowl for aprox 8 hrs with No evidence of well plug leaking
Last edited by My2nd 69 442; September 14th, 2016 at 03:27 PM.
Having a difficult time finding the secondary rods 7073655 AU rods.
Carbs unlimited has a pair of DA/CY rods with a .0443 tip.
Located primary rods (49B)
Can anyone tell me if these are ok for my carb # 7029253
Having a difficult time finding the secondary rods 7073655 AU rods.
Carbs unlimited has a pair of DA/CY rods with a .0443 tip.
Located primary rods (49B)
Can anyone tell me if these are ok for my carb # 7029253
CV rods are almost identical to AU rods and I'm pretty sure they are available. When I rebuilt a 7042251 for my 455 it was running too lean at WOT (I was using CG secondary rods, which have a huge tip). Cliff Ruggles suggested a CV with a short hanger. I happened to have a set of CV's from another carb so I didn't need to buy them from him but if he recommended using them he must sell them.
I always buy my rebuild kits from Cliff. They cost about $20 more than my local NAPA but it's a top quality kit and when you purchase a product from him the advice after the sale is free. He's in the office answering emails at about 5:30 AM. He's probably the best vendor I've ever dealt with.
Last edited by allyolds68; September 15th, 2016 at 05:12 AM.
Thanks Mike for your post
Just a short update on my carb issue. I'm currently awaiting a return call from Cliff Ruggles in hopes that he will advise me on the best parts to put back into my carb.
I will update all when I get additional info.
Please keep you guys advice and suggestions coming.
I love this site cause you guys are such a great help
Got my call back from Cliff Ruggles and he was very helpful. He will be sending the parts that I need to make my Carb right for my engine. Said with my cam specs that I need near W-30 spec. carb internals.
He also informed me that the brass floats are crap(not quite his words).
So take that as you may.
I look forward to getting the parts and getting the carb back together. Today would be a great day for a cruze.
September 13th, 2016, 03:12 PM
