Rochester Marine Quadrajet Overhaul
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- čas přidán 25. 01. 2022
- This is a detailed presentation of teardown, inspection and assembly. Common assembly mistakes are found and corrected. This specific carb is off of a 1983 270HP Crusader Marine engine for Dark blue Charters out of Manistee, Michigan.
Visit www.darkbluecharters.com and their CZcams Channel here:
/ @tangledtacklefishing
You can visit our website www.lakelandautomarine.com. - Auta a dopravní prostředky
Excellent video, thank you. My rebuild would hav been all wrong without this and I would have been in big trouble, great job, cheers
Great video, I watched many Quadrajet CZcams videos. I think this is the best one. Lots of great information here. Thank You!
There's only 2 videos worth watching how to rebuild a Quadra Jet carb and this is one of the best! Thank you for doing it. I really learned a lot quickly from your income full video.
You're a maestro sir !! It's always a pleasure to watch a pro at work making everything look so easy. Awesome job on Chris' carbs. He did well to send them to you for the rebuild. Cheers
Thank you very much for a great informative video, I had a great success rebuilding my carburetor with your video
This video was helpful and very well put together! Thanks!
Glad it was helpful!
Absolutely the best video I have seen on a Quadrajet overhaul. Really well explained.
Wow, thanks!
Amazing work Chris. I can't say thank you enough for getting those sorted out.
Glad we could help!
Great and well done video. Thank you!
Thanks for the detailed video rebuilt mine with your help and I runs better than ever.
Great to hear!
I've owned 3 quadra jets now, this video makes me like them just a little more. It's the nuance's and I appreciate them.
VERY GOOD video. Thanks.
brilliant , carb master video at it's best
I noticed your big paws get in the way, of the view, in critical times. However your instructions are the best. Thank you.
Its a testament to the quadrajet that its used in marine applications
Thank you!
I have to say this is a great video. Lots of great detail. Only complaint is would be extra great with like a split view of an over head close up shot when doing certain things to help see a bit better but still definitely a great video. I’m gonna call you out in the choke lever you forgot to install. Editing for the win lol.
Nice video
The best ever video for Rochester marine carb👍👌
Would you please explain in writing down the measurement of the float lever in “millimetres” because I couldn’t realise it exactly….
Thank you so much
Damn, I must have missed you taking out the idle air screws ugh! Watching now you telling me to put them back in I'm like huh.
Isn't that crimp mounted diaphragm assembly for opening the secondary side ? I'm pretty sure the first item removed was the choke stove. That's what's used for operating the choke on a Rochester. Great visual how to video. I like how you're pointing out all the little things , like the secondary rod identification letters and all other explanations. Nice job man . 👍
Just had my quadrajet 4 barrel carb done at a carb shop here and I'm trying to tune it and it's been tough. I did notice on the choke linkage side of the carb there is gas going in at idle but none on the other barrel.. 91 5.7l omc cobra...in a ski sanger
Sounds like something is plugged up...
Hey I really appreciate your video on this, I have the Rochester quadrajet on the OMC cobra 5.7 gm 350, I have a couple of questions, on my primary metering rods I do not have that spring that you mentioned in this video was installed incorrectly do I need that spring, and then the gasket you mentioned you only seen the Omc use that you believe is to prevent the lag? Should I use that gasket or the one that does not have the gap between the primary and secondary’s? Thank you so much!!
Great vid. My kit came with a black foam to cover main plugs. Is this needed after jb?Also my kit came without the accel pump spring.needed to remove from old one.Don`t ask me how i know..lol 20 minutes later too find the spring that launched
My last run of the year I was running really rich with black smoke. Then half way to my destination, port engine quit. Would start back up and idle but die with throttle. Any suggestions? Was think accelerator pump took a shit. As for black smoke I'm unsure. (Both engines black smoke)
Sounds like fuel supply. Does it start good when cold? If so, pump most likely isn’t your concern.
Fantastic video here’s my question. Carburetor Rochester four barrel on a boat just like what you’re demonstrating it was rebuilt by a guy and his company down in Florida that specializes in it the ability to test without putting it on the water I wish I knew his name it was set up by my marine mechanic. What is that white pad inside at the bottom of the secondary chamber.
This video is amazing. Clear and concise instructions, educational explanations. To me, a dumb young 26 yr old engineer, carburetors were just magic before, and now I know some of all the engineering that goes into how they work.
Also, you saved me 400 bucks on my project boat. Followed this video and that 1978 Chevy 305 is running like the day it was made. Thank you so much sir for your video and best wishes to you.
Quick question I had that some others might - the needle seat in my carburetor had two cut outs on the side in addition to the hole in the top. The one in the kit didn’t have those cutouts. Are those for higher fuel flow or something? Thanks again!
Just design is all. It really doesn't matter IMO.
I came here just for the stupid spring on the jet needles and i didn't see shit! Get closer, and use smaller tools next time please 🙏 other than that this is by far the best info ive found so far on these new to me marine quadra craps. 👍
My 1988 318 has this carb. It starts fine and runs fine , with no black smoke while running But It smells rich and black carbon is visible in exhaust water at idle. Is there an adjustment to correct this or is a rebuild the only fix ?
Do I need the choke, and can I put an old fashioned knob choke in cab for manual control? Thanks in advance. I am going to run all manifold vacuum from the intake, and plan to put a vacuum gage and o2 meter gage for manual afr.
Thank you so much. Followed your video and hopefully should work 😂
Would you please let me know if I can use an automotive Rochester Q-jet carb for my boat(if I block all its vacuum connections) for my boat?
You could, but the calibration most likely won't be correct along with the throttle linkage.
Can i bend the tab the way you did on a 83 Pontiac Volvo carb? I looked at the linkages and i didn't see one that looks like what you bent but then again, your hand was in the shot. Thanks in advance. This was an amazing video
One more question friend, I'll tell you, I have a Rochester Quadrajet carburetor and I want to change the primary nozzles along with the primary needles, and since there are different numbers of nozzles and primary needles, I have to deduce that depending on the number of nozzles, I must set the needle number equal to the nozzle number? I mean, if I put number 0.72 primary nozzles, should I put number 0.72 primary needles? I understand that in this way, the idling engine has the primary nozzles blocked with the primary needles, since they are of the same diameter, and that when accelerating and losing vacuum, the primary needles begin to rise, allowing fuel to pass to the primary jets, is that correct? all the best
Great video!! How much do you charge to rebuild these?
Nice instruction, thank you, but the low resolution makes it difficult to see the finer detail like the primary needle retaining spring.
Thanks! It was shot in 4K and if you watch it on a 4K TV it comes in not too bad.
what is the difference between a marine carburetor and a car carburetor ? and why are they paint in colour like blue and Black ,i am talking about the QUADRAJET ? and also your video are one of the best ,it is sensas ,very instructive thank you .i can not find your other video on QUADRAJET ,could you give me the link please ? thanks you
Question: for some reason the vacuum does not release when full throttle and idles rough when vacuum is connected and bogs because it won't allow the big barrels flaps to open. Kinda weird and runs much better with the vacuum disconnected. Carb is rebuilt ,Would you know what could cause the vacuum to not release when opening up the throttle?
Sir, I have a 260HP Crusader engine with a rochester Q-jet carb(7028282), since I don’t have access to its original parts to overhaul it, I decided to change it.
I have actually offered a Holly carb(No: L7456) to buy and replace it with that Q-jet… Do you recommend that at all?? I mean which one you prefer? Holly or Q-Jet which performing better??
Thanks for your help in advance.
I like the Q-Jet.
I disassembled mine today. On the throttle body where yours has the two skinny tubes pointing downward mine has four of them. Are they all four supposed to come out when you remove the throttle body from the air horn?
Some have two, others have four.
How do you final adjust the jets after the carburator is installed on the motor? This is a fantastic video. Also, I can't find my part number in any listing for a rebuild kit. The part is17080565 date code 0054.
Turn the idle screws in or out till you get your highest and smoothest idle. Or you can use a vaccum gauge till you achive your highest reading.
As you say in the video, if I have not misunderstood, both the primary and secondary needles should cut off the flow of gasoline at idle, that is, if I mount the primary needles, I press them as if the engine were generating a vacuum, it should not if there is clearance between the needles and the nozzles, and also in the secondary needles, ????? And if the fuel level float is higher than it should be, would it also enrich the mixture more?
greetings and thanks for your video
Do you know which way the “brass filter” one has to go inside of inlet Rochester carb??
Do u recommend them for marine’s one at all?
Open part goes towards the fuel nut inlet. Yes, we do recommend them.
@@LakelandAutoMarine .
Thanks for responding, well these kind of filters look like both sides are open…!!!
One side has a small hole and the other side has tapered cone…
That’s why I got confused actually…
Is there a fast idle cam on a marine quadrajet ? Also is there s fast idle set screw on a marine quadrajet as well?
There is not. The linkage is there sometimes, but I haven’t run across one that the screw is present.
What would you charge for this minus shipping?
My marine Rochester Quadrajet carburettor’s secondary valve doesn’t open completely 90 degrees as the primary valve when I fully open the throttle, is it normal?
Yep, perfectly normal.
@@LakelandAutoMarine .
Thank you so much for your answer, the only thing caused me to hesitate for that, because I checked with other Q-Jet(not marine one) and seen the difference, 2 secondary blades was opening as primary blades completely 90 degrees…
I have the same Carb on 1996 350 Chevy engine boat and the other day I took the boat out to sea gave it the gas and it bog down and died, I started again and begun to wave and then died, It started right up but wen I gave it power it did the same thing, it runs fine in low power. What do you think it is?
Sounds like fuel delivery. Check fuel pump pressure/suction first. Also ten on a separate tank of fuel as well to eliminate your tank and fuel pickup.
What do you do if you have a Preston needle and seat can you thread the main body for a threaded one
The real early ones were like that. Yes, you could tap it.
Hi. Thank you so much for the video. I have a question. My numbers have been ground off on my quadrajet and I have an electric choke setup. Can I still get a service kit to do a strip down? I dont know which kit to order. Maybe I could send you some pics by email. I would really appreciate a little help as I am in UK and there are no specialists. The carb is from a GM 5.7 LG SGI motor 10263880. A kit would be fantastic, if only they were universal enough and I knew a part number. Thanks again. Nigel
Que número de espera primaria o chicler lleva para un motor OMC cobra 5.0 v8 ,? Un saludo
Would you please write down the measurement of the float lever (in Millimetres) because I don’t actually realise it in inches… many many thanks
6.35 MM
@@LakelandAutoMarine .
Thank you so much
@@LakelandAutoMarine would you pls let me know if that primary metering rod retainer spring is missing, is it going to be a big issue or not really?
Yes, that would be a big deal as under a load the metering rods won’t rise out of the jets to allow more fuel into the engine. That could cause issues it drivability concerns.
sorry to bother you again, I took my marine Rochester carb to a mechanic for repair, when he took off the carb,s head told me that my carb is missing 2 big air hornes...!! I have just checked your marine Q-jet carb and seen the same thing,,, it seems they have only 2 air hornes instead of 4, am I right?
I meant those straight brass pipes
The metering rods? Post a picture.
What’s the name of that seat removal tool?
It’s an old Burroughs tool. They made carburetor tools years ago.
Great video! Price to rebuild a marine qjet ? Price& timeline ,also where to send it , contact info please? Thanks again!!!!
Send us a submission on our website www.lakelandautomarine.com.
Not going to check the throttle plates for leaking around the shaft
I would like a dollar for every Holden dealership that has destroyed a roachestor 😢
And you're not going to reseal the bowls either shame on you
Nice video