Qjet base plate repair - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vince1 · 05-19-2019, 09:29 AM

https://youtu.be/R86zI4ii0nk

I thought I would share this as to how to repair a worn out throttle shaft bore in a quadrajet carburetor base plate.

Finding a worn out bore has put my rebuild on hold for a bit.

Nappers · 05-19-2019, 12:27 PM

I've watched a couple of his video's, he does a good job.

If you don't want to wait, Summit Racing has "remanufactured" QJets, long as you have a rebuildable core to send back.

Summit Racing QJet: https://www.summitracing.com/parts/sum-250200

Jet also makes them. Not sure if one is better than the other, Jet are more expensive.

I have 2 QJets that I'm either going to rebuild or go the Summit Racing way.

vince1 · 05-19-2019, 01:35 PM

The fun is in DIY but this one sure does seem a lot more complicated than the Holley I did so many years ago. Tomorrow I'll see if I can find a reamer that costs less than a carb.

Nappers · 05-19-2019, 03:56 PM

Yeah, I hear ya. I've rebuilt a couple of QJets. I have several sets of secondary needles that I play with. They are stamped and I looked up the stampings and put the middle of the pack for Wide Open Throttle (WOT) and it ran pretty fast up into the higher range. Got pulled over by a CHP upon doing so. LOL. I wish I had a reamer to loan you. I haven't had to do that.....yet.

Nappers · 05-19-2019, 04:14 PM

Here's a kit from Quadrajetpower.com: https://quadrajetpower.com/primary-s...shings-screws/

**sirJim** · 05-20-2019, 12:00 AM

You might want to look at Lars Grimsrud´s paper on QJet´s works great.
do a google.

geezer#99 · 05-20-2019, 12:26 AM

Quote:

Originally Posted by sirJim

You might want to look at Lars Grimsrud´s paper on QJet´s works great.
do a google.

https://www.digitalcorvettes.com/for...ad.php?t=88376

stsalvage · 05-22-2019, 08:05 PM

what you need a base plate I can look to see if i have a few extra's I like to see a pic of what your looking at and i will see if i can match it I'm In Calif so are stuff here is a lot better then other places in the country

vince1 · 05-24-2019, 06:02 AM

Thanks for the offer but since posting I took another look at it and decided it isn't that bad and will use it as is. I found one bent needle metering rod and one plugged jet. The float pintle also had a big groove around the rubber part which could explain all the gas in the oil. It is now back together with only the choke to put on..

05-19-2019, 09:29 AM	#1
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,170	Qjet base plate repair https://youtu.be/R86zI4ii0nk I thought I would share this as to how to repair a worn out throttle shaft bore in a quadrajet carburetor base plate. Finding a worn out bore has put my rebuild on hold for a bit.

05-19-2019, 12:27 PM	#2
Nappers Registered User Join Date: Sep 2018 Location: Yreka, CA Posts: 43	Re: Qjet base plate repair I've watched a couple of his video's, he does a good job. If you don't want to wait, Summit Racing has "remanufactured" QJets, long as you have a rebuildable core to send back. Summit Racing QJet: https://www.summitracing.com/parts/sum-250200 Jet also makes them. Not sure if one is better than the other, Jet are more expensive. I have 2 QJets that I'm either going to rebuild or go the Summit Racing way.

05-19-2019, 01:35 PM	#3
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,170	Re: Qjet base plate repair The fun is in DIY but this one sure does seem a lot more complicated than the Holley I did so many years ago. Tomorrow I'll see if I can find a reamer that costs less than a carb.

05-19-2019, 03:56 PM	#4
Nappers Registered User Join Date: Sep 2018 Location: Yreka, CA Posts: 43	Re: Qjet base plate repair Yeah, I hear ya. I've rebuilt a couple of QJets. I have several sets of secondary needles that I play with. They are stamped and I looked up the stampings and put the middle of the pack for Wide Open Throttle (WOT) and it ran pretty fast up into the higher range. Got pulled over by a CHP upon doing so. LOL. I wish I had a reamer to loan you. I haven't had to do that.....yet.

05-19-2019, 04:14 PM	#5
Nappers Registered User Join Date: Sep 2018 Location: Yreka, CA Posts: 43	Re: Qjet base plate repair Here's a kit from Quadrajetpower.com: https://quadrajetpower.com/primary-s...shings-screws/

05-20-2019, 12:00 AM	#6
sirJim Senior Member Join Date: Sep 2016 Location: Denmark Posts: 309	Re: Qjet base plate repair You might want to look at Lars Grimsrud´s paper on QJet´s works great. do a google. __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=737695 62 burb in the making.

05-22-2019, 08:05 PM	#8
stsalvage Scrapper 1 Join Date: Jan 2007 Location: Riverside Calif Posts: 1,649	Re: Qjet base plate repair what you need a base plate I can look to see if i have a few extra's I like to see a pic of what your looking at and i will see if i can match it I'm In Calif so are stuff here is a lot better then other places in the country

05-24-2019, 06:02 AM	#9
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,170	Re: Qjet base plate repair Thanks for the offer but since posting I took another look at it and decided it isn't that bad and will use it as is. I found one bent needle metering rod and one plugged jet. The float pintle also had a big groove around the rubber part which could explain all the gas in the oil. It is now back together with only the choke to put on..

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