Rebuilding a GM Rochester 2Jet carburetor complete overhaul

Подписаться 11 тыс.

Просмотров 31 тыс.

50% 1

I purchased this carburetor last winter for a little project to give me something to do why recovering from surgery, as I really enjoy overhauling carburetors. For some reason I never got to it. I've been cleaning up the garage a little, and wanted it out of my way, so I finally overhauled it.
It's a GM Rochester 2-Jet, an ultra common carburetor used on Chevrolet V8's. This 2-Jet even has the Chevrolet bowtie with "Bay City" in the bowtie. I have overhauled hundreds of these old 2-Jets.... I have never seen one with the bowtie and Bay City in the bowtie. I'm wondering if this carburetor was made in Bay City for the Flint engine plant.
This is a long in-depth video on rebuilding one of these simple Rochester carburetors. If I get a lot of likes and views, I will rebuild other carburetors on video.... including four barrels and other brands like Holly, Autolite, Motorcraft and Carter to name a few.
I often see carburetors in estate sales. I'll start buying them to rebuild and sell, if there is interest in seeing that.
When I was working as a Marine Mechanic, I rebuilt thousands of carburetors, as marine engines used carburetors well into the early 2000's..... Plus all the carburetors I overhauled for old cars and friends carburetors for their cars. I also enjoy overhauling starters, alternators and generators and have done hundreds of them too over the years.
Here is my video on overhauling a Rochester 4-Jet, 4GC; • Rebuilding a Rochester...
Instagram | / old_car_alley
If you like my video, hit the like button.
If you like my channel, please subscribe and thank you for watching.

Авто/Мото

Опубликовано:

28 окт 2022

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 79

@JosephGreco-s4q 15 часов назад

You did a great job showing step by step rebuild. Thank you

@OldCarAlley 12 часов назад

I'm glad my video helped you out.

@jdgimpa Год назад

Rebuilding Carburetors is a lost art. When I started in the automotive repair business in 1968 I learned how to rebuild carburetors. Some of the people I worked with didn't like to rebuild them. Tune up and Carb repair were something I specialized in. When I quit wrenching in 2000 and went into the management side of the business I was the only guy in the shop who knew how to rebuild them. By the way the owners manual for my 66 Chevy told you how to tap on the carburetor if the float was sticking.

@OldCarAlley Год назад

Engine performance, heavy engine repair and electrical were what I specialized in at the Ford Dealer.

@jacobtaylor3669 11 месяцев назад

It's hard to find good, in depth videos like this, and it is a gift when someone takes the time to make them. Thank you very much

@OldCarAlley 11 месяцев назад

Soon I will be doing one on overhauling a NOS Rochester 4Jet.

@bcbit01 Месяц назад

Thank you for such a thorough review. After watching it a couple times (and referring to it a couple more for a gut check during reassembly), I rebuilt the 2GC for my marinized 250 L6. Very nice job!

@OldCarAlley Месяц назад

Awesome! Glad my video helped you out.

@stevetaylor1593 Месяц назад

Just what I was looking for. Excellent presentation.

@OldCarAlley Месяц назад

Glad my video helped you out.

@11silver-bullets 10 месяцев назад

Got mine soaking. Definitely a great video Hopefully my 64 Impala fires up without a hitch . Was running pretty rich and backfiring after sitting 16 years. Surprised it even fired up .

@michaelkehm3663 Год назад

Thank you Howard for another informative video. Don't know how many of those Rochester 2G carbs I have overhauled, but totally enjoyed watching you do it. Thanks again for showing us the lost art of a carb overhaul.

@OldCarAlley Год назад

Same here.... it's been hundreds of them for me.

@bradhoward9055 Год назад

Watching you rebuild that carburetor made me realize why I enjoy your videos so much, you always do things the right way. It doesn’t matter if you’re painting or repairing a clock, you just apply logic and experience to do a pretty much perfect job. Thank you so much for sharing.

@OldCarAlley Год назад

I figure, if I am going to do it, I might as well go all out and do it right. At the end of the day it's less work to do it right, because you don't end up having to redo it.

@tomsimon2530 Год назад

I live in Bay City , Mi. and once worked in the Chevy plant there - currently having my Rochester carb. rebuilt -- thanks for a great detailed video !! You rock !! I have a 1950 Chevy Sports coupe with a 1958 - 283 with 2 barrel ( from the numbers on the block ) came out of a 1958 Corvette !

@DCR52 Год назад

Howard, you have been blessed with a lot of talent. Sadly your kind of talent will eventually dwindle away. I enjoyed the video.

@ronaldhagadorn5512 Год назад

Back in the late 70s and early 80s the Chilton book was my go to! I wish I had utube back then!

@OldCarAlley Год назад

I still have a couple 70's era Chilton manuals. I prefer the factory service manual for exactly what I am working on, so everything can be set up to factory specs.

@ronaldhagadorn5512 Год назад

@@OldCarAlley I look up the firing order in my old books. I trust the specs in these books too.

@OldCarAlley Год назад

@@ronaldhagadorn5512 The specs in the Chilton and Motor's manuals are often correct. They just don't have the details for every model car, the book would need to be six feet thick, considering all the cars one manual covers.

@krypttoenight9971 Год назад

Summit has them going for 370.00 geeez 😂 I tried rebuilding it but no deal. I enjoyed the video, thanks.

@vocopro100 Год назад

Thank you for the video. Just finished rebuilding mine for my 3.0 Mercruser.

@OldCarAlley Год назад

Rebuilt more of them than I can remember..... I'm a retired marine mechanic.

@richr4947 Год назад

👍 Great video Howard, it was interesting info for me since the most I’ve ever replaced was an accelerator pump on a ‘74 Buick 40 years ago.

@RastusMcbride 10 месяцев назад

Wow, meticulous, raised the bar for me. Mines off of a rescued boat, 300 Buick engine. Thanks for the helpful vid.

@jasilva78js 8 месяцев назад

Great video and so much knowledge and experience 🙏

@jakebullet8990 Год назад

Howard, what a good video. I really think these carburetors are underappreciated. As I rebuild my 1967 Tempest, I'm seriously thinking of putting my original 2jet back on the 326. Back in 1985 I drove my Tempest from Arizona back to Michigan and going across the Great Plains I was averaging 24 mpg. How can you beat that on an old V8. Anyway, thanks for the inspiration. I very much enjoy your work.

@brianhdueck3372 Год назад

Nice work Howard. Week after next I have a carb like this coming in for rebuild. Looking forward to the job. I haven’t done a Rochester 2 barrel in forever so this is really helpful. I’ve done numerous Holley, 2100 Fords and Edlebrock but these have eluded me. There are very few guys round these parts still doing carbs. Cheers!

@OldCarAlley Год назад

Back in the early 80's a friend owned a carburetor rebuild shop. When he would get behind, he always called me to help him get caught up. One carburetor I was really good at was the Motorcraft Variable Venturi.... no one knew how to set them up. They were super easy, for me anyway.

@brianhdueck3372 Год назад

@@OldCarAlley conceptually the variable Venturi was a very good carb and the ones that worked did very well. The problem with them was Ford had little if any field training for the dealerships so most cases all they did was swap them out for 2100’s. Sad for customers but great for the few guys who actually understand them.

@OldCarAlley Год назад

@@brianhdueck3372 Thats exactly correct. I worked in a Ford dealer when they came out. There was zero training on servicing them. I got the shop manual out and learned by doing one. After finishing it up, I though what a simple carburetor. Only issue is you do need a good dial indicator to set them up, but once set up, there is not much else that needs be done to them. My 81 Country Squire had one. That car ran great, and got 24 mpg.

@liljoeii6091 Год назад

Thank you for the video

@roycewheat1897 3 месяца назад

Very good!!

@frankieiroc Год назад

Im rebuildindg same carb at the moment for a buick special...thanx for sharing.

@OldCarAlley Год назад

A lot of GM brands above Chevrolet used a larger two barrel, but they're still basically the same in overhauling them.

@TylersNeighborhoodGarage Год назад

Carb looks great. Apparently the carbs with Bay City on them were actually produced in the Chevrolet plant there, not by Rochester. That would explain the bowtie. They probably needed more carbs than Rochester could supply, sort of like in 1971 when Chrysler used Rochester 2Jets on some 318 engines instead of the usual Carter 2bbl.

@OldCarAlley Год назад

Yes I remember seeing 318's with Rochester's on them. A lot of people don't know both Rochester and Carter built the Quadrajet. My brother had a 85 Dodge 1500 Prospector with a 360 equipped with a Carter Quadrajet from the factory.

@MoparDan Год назад

Howard, I enjoyed watching this video on your carburetor rebuild. My only hands on experience with Rochester carburetors were disassembly and cleaning of Quadrajets for 1978 and 1986 vehicles. The 1978 carburetors of which I did two were model M4MC and the 1986 carburetor was an E4MC model. The M4MCs were for a 1978 Chevrolet C10 pickup and a Pontiac Firebird. The ’86 carburetor was for my Oldsmobile Cutlass Supreme that I had at the time. The air horn on the ’86 Quadrajet had a binding secondary air valve shaft that I carefully reamed with a correct size drill. When I drove the car afterward there was quite a difference because the secondary’s worked for the first time since the car was new. It’s amazing what it took in the day to meter fuel before fuel injection came on the scene.

@geraldbrown8711 Год назад

This is a great video for me to reference when I get ready to rebuild the Rochester 2GV on my 1968 Impala Sedan. It has the divorced style choke instead of the choke housing like yours. I'm guessing it is similar to rebuild. Thank you for this video

@OldCarAlley Год назад

Exactly the same carb, other than the choke set up. It's a very simple carburetor.

@jonathanyoung7763 5 месяцев назад

About to rebuild a ‘84 Isuzu Trooper II carb. I replaced the accelerator pump because the boot was leaking, but now after getting it running it’s clear it needs a rebuild/cleaning. Runs/idles great once it’s warm, but does not want to start and idle cold at all.

@OldCarAlley 5 месяцев назад

Check to make sure the choke is functioning correctly and check for vacuum leaks, when doing your overhaul of the carb, as both will cause hard cold starting and poor cold performance. On some carb's, the throttle body comes loose from the float body, causing a vacuum leak making very poor cold performance.

@jonathanyoung7763 5 месяцев назад

@@OldCarAlley alright I’ll do my best. I work on newer vehicles so this old stuff is new and different to me. Thank you for the advice and help!

@jonathanyoung7763 5 месяцев назад

@@OldCarAlley I replaced all the vacuum lines that were cracking or brittle that I could find and made sure all were connected. I’m working without any manuals so it’s all half-educated guessing. There is a vacuum sound when it’s idling though, especially when it’s not at operating temp yet and when it stalls it’s a heavy vacuum sound as it dies out.

@OldCarAlley 5 месяцев назад

With it running, spray carb cleaner around the carb base, throttle shaft, intake runners, anywhere there would be vacuum. The engine will smooth out as soon as you hit the vacuum leak with the carb spray.@@jonathanyoung7763

@jonathanyoung7763 5 месяцев назад

@@OldCarAlley oh sweet I will try that as soon as I get a chance to work on it again. It’s a personal project, but I’ll be traveling all next week, so I’m planning to get back at it when I’m home the following week. I’m excited to try these tricks!

@albarino6 24 дня назад

Thanks for the video. I'm about to attempt to rebuild a similar carburetor from a 1969 el camino inline 6, 250. I hope I can find the correct rebuild kit.

@OldCarAlley 24 дня назад

Hopefully it helps you out.

@old-man173 Год назад

Boy you sure know your ins and outs on those carbs

@OldCarAlley Год назад

I couldn't even begin to count how many I have overhauled over the years.

@majorpayne5289 Год назад

👍

@josephtmerli1673 2 месяца назад

Howard, Can you tell me the float level and drop in inches for a Rochester 2 barrel G2 that came from a 1969 Chevy G10 van 307 V8 and if I measure to the solder joint or bottom of the brass float. Oddly, the kit I bought came with a cardboard measuring tool but no spec sheet to tell me the measurement and I cannot find anything on line. Thanks. Joe

@OldCarAlley 2 месяца назад

I wouldn't have a clue on the specs, as I don't have a 69 shop manual to look the specs up. If you don't have the correct shop manual, I would suggest purchasing one.... it will have all the correct factory specs in it.

@davidfry7837 Год назад

Is there any adjust to the accelerator pump. Where the rubber meets the too of the carb? Your video is awesome.

@OldCarAlley Год назад

Some have two holes in the pump arm, otherwise you bend the linkage slightly to get it to specs., which are in the shop manual.

@johnlagatta5841 Год назад

Great video. Where do you get your rebuild kits from? Looks like a good quality one.

@OldCarAlley Год назад

I get them from a guy on eBay that sells ethanol resistant kits..... Others are from estate sales.

@johnhotrod3231 10 месяцев назад

Have you ever seen a vacuum dashpot on one of these? My 65 pontiac has one, but i cant find the adjustment procedure.

@OldCarAlley 10 месяцев назад

Yes the plastic pot is common. To adjust it, bend the linkage why it's under vacuum.... its often shaped so it can be bent. I use a drill bit in the size the shop manual states, between the lower part of the choke plate and the air horn.

@harryjohnson5118 3 месяца назад

I've got a '66 Chevrolet 1/2 with a 283 not original to the truck. It has a Rochester Dualjet 210 carb. My brother-in-law is going to assist me in rebuilding the carb. I see that you take all the screws and springs and clips out and toss them all together. Will the assembly instructions that come with the rebuild kit show exactly what screws to use where when re-assembling?

@OldCarAlley 3 месяца назад

There are NO instruction on where fasteners go, so keep them in order if you're unsure where they go. I have done thousands of carburetors, so I just know from experience where they go, thats why I just through them into one container for cleaning.

@harryjohnson5118 3 месяца назад

Thanks for the response. I may have to have several small cups to put them in and then label them as to where they go back to@@OldCarAlley

@noneckjoe948 9 месяцев назад

Is it possible to fix the choke butterfly plate that binds up in the air horn? It appears to be out of round or warped like you described; probably from over tightening the wing nut. Very carefully grind the edge so it closes and seals? Or would I be making a huge mistake?

@OldCarAlley 9 месяцев назад

Yes, thats about the only cure for a warped air horn.

@noneckjoe948 9 месяцев назад

I took a tiny bit of material off of air horn and butterfly… closes perfectly now with no binding… thanks for your input.

@bigmanlee8732 6 месяцев назад

I was taking out one of the smaller jets and it chipped on me ! Im thinking about just getting a drill tap and getting it out that way, any other ideas

@OldCarAlley 6 месяцев назад

Maybe an easy out.....

@MrBrianbusch Год назад

Aside from not being stock Are you ok with systems like the Edelbrock efi

@OldCarAlley Год назад

Yes, they're really good set ups. If you're doing a custom, I would highly recommend using one.

@RastusMcbride 9 месяцев назад

I noticed that carb doesn't have those cylindrical baffles that insert into the carb body under the large ported tubes on the venturi? Seems I have one 2-jet that does use them (smaller cfm) and one that does not, unless I lost one pair of them somehow. The ones I have (after taking apart two carbs) match the holes on the smaller carb/venturi/bore. Are these baffles crucial to correct carb function, at least if it came with them? Plan is to go with the venturi that came with the larger cfm carb, without the baffles. Any thoughts appreciated.

@OldCarAlley 9 месяцев назад

Some carburetors they just set in the opening for them, then the venture attaches over them. the engine will not run above idle if they're plugged or missing. I find most 2gc and 4gc carbs have fixed tubes, but have seen them with separate tubes also.

@RastusMcbride 9 месяцев назад

Thanks.... used the larger body/venturi without the tin tubes, seems to run well, engine has very quick response.Think it's a bit rich though with 6X jets, the idle mixture screws don't have much of an effect- 300 V8 200 hp, will try the 5X jets from old carb. Also with my old marine linkage on the new carb, the idle screw doesn't have anything to push against but seems to idle about right anyway. Think I need to readjust float, was pyramid shaped no carb numbers couldn't find any reference. Can pump gas in with boat tank "squeeze bulb" till it overflows and stumbles so try a quicker shut-off level on the float? Thanks again. @@OldCarAlley

@OldCarAlley 9 месяцев назад

@@RastusMcbride Make sure the float docent have gas in it. Shake the brass ones, squeeze the plastic ones close to where the metal goes into them, making sure gas docent seep out where they go into the plastic. 90% of those old 2GC's use the same float.... correct float level is very important.

@RastusMcbride 9 месяцев назад

It's brass and has a bulge on the bottom roughly pyramid shaped. No liquid inside... thanks. @@OldCarAlley

@tommarchant2 3 месяца назад

How do you remove that power rod stem? Mine doesn’t move at all

@OldCarAlley 3 месяца назад

There not meant to come out, due to being staked in at the factory. However you can use a small punch and gently tap the stakes back, then gently wiggle the rod out. Make sure you re-stake it when reinstalling it.

@tommarchant2 3 месяца назад

@@OldCarAlley Thanx... mine was bad... I lightly tapped on it and finally got it to move again... but it was super sticky and rough... and the spring was brittle and broken... I was able to get it out and have ordered a replacement... thanx again for your video... it helped me a lot... I have the older model without a choke at all... just a manual choke cable... I've ordered the rebuild kit, power rod stem, and a new power valve (my power valve was stuck and got damaged getting it out)... wish me luck... this is my first Rochester rebuild... :)

@OldCarAlley 3 месяца назад

They're ultra simple carburetors. The Quadrajet and Thermoquad are a bit more work, but good carburetors. @@tommarchant2