how hard is it to rebuild 1b rochester car - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mikey2409 · 01-12-2013, 03:51 AM

Starting to notice my carb is acting up in the morning after releasing the manual choke it putts and once I awhile on very cold days my truck comes and or leaves on a stop putting like if it had a missing fire im also noticing a slight backfire from the float allowing more fuel in it so im wondering if I should attempt a rebuild it myself or send it to get rebuilt since ive never rebuilt a carb and being a tech ive never have fixed one besides replacing or adjusting do to todays modern complexes systems
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RANDY COX · 01-12-2013, 08:36 AM

If you have any Mechanical skills at all,you can do it,there's not alot too them..but if you don't feel comfortable then let the pro's do it...

sjarrett71 · 01-12-2013, 10:51 AM

Can't be too hard, I did it!!

Seriously though, it really is not that hard. Just be sure to follow the directions.

68gmsee · 01-12-2013, 11:08 AM

I've done several also. Nothing to them just have dive in.

The best thing is that you can't go wrong. If after taking it apart and replacing the parts needed it's still not right, you're not out a lot of money. You also learn how they work and what's inside them.

Be sure and get a couple of cans of carb cleaner. Replace all the gaskets. If it's a monojet there's two large phillips head bolts on the bottom you need to remove to replace the middle gasket.

mikey2409 · 01-12-2013, 11:12 AM

Yeah its a monojet
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geezer#99 · 01-12-2013, 11:22 AM

Might be nothing wrong with the carb. Could be cold intake.
Is the heat riser plate working?
Here's a link to pics of one.
http://advrider.com/forums/showthrea...=653845&page=7

mikey2409 · 01-12-2013, 01:55 PM

Quote:

Originally Posted by geezer#99

Might be nothing wrong with the carb. Could be cold intake.
Is the heat riser plate working?
Here's a link to pics of one.
http://advrider.com/forums/showthrea...=653845&page=7

Hmm not sure if the heat riser plate is working I know that all the wires for the tcs were cut and removed could that be a cause if the heat riser plate is not working but I know thats was gms cheap emissions system back in time
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geezer#99 · 01-12-2013, 02:29 PM

Heat riser is not related to the tcs. Heat riser also isn't an emissions device. It's there to help heat the fuel vapour in the intake when the motor is cold. Cold fuel vapour reverts back to a liquid if not kept warm. Once the intake warms up the heat riser opens. It has a bi-metalic spring on it.

mikey2409 · 01-12-2013, 02:37 PM

Quote:

Originally Posted by geezer#99

Heat riser is not related to the tcs. Heat riser also isn't an emissions device. It's there to help heat the fuel vapour in the intake when the motor is cold. Cold fuel vapour reverts back to a liquid if not kept warm. Once the intake warms up the heat riser opens. It has a bi-metalic spring on it.

Good to know
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PanelDeland · 01-12-2013, 02:37 PM

If it starts running much better after it warms up,then geezer may have solved your problem.Rebuilding it isn't hard at all.I've done a few and you just need to remember to do what the instructions show and that those leftover parts from the kit are suposed to be leftover.The kits are usually designed to cover several versions of the monojet.

68gmsee · 01-12-2013, 03:50 PM

Check the hear riser but from the first post where you mentioned that it putt, putts after you open the choke, the assumption is that the truck has warmed up sufficiently to not need the choke or heat riser.

I don't believe you get the extreme temperatures in your part of Oregon as farther inland or in the higher elevations so the heat riser not working would not affect it as much there. I ran my 68 with the heat riser wired open for years here in Texas with no problems. Winter temps can get down to the low 20's at times. Just have to choke it more.

Sixteen Tons · 01-12-2013, 07:39 PM

Rebuilt my first Monojet a month or so ago using one of the kits available online. I just took my time, made sure everything was clean enough to eat off and after checking all the calibrations twice, I checked 'em again. From removal to rebuild to reinstall, I would say it's very manageable. And the real payoff was my truck runs a million times better. Good Luck!!

01-12-2013, 03:51 AM	#1
mikey2409 Registered User Join Date: Dec 2012 Location: Bell Gardens Ca Posts: 151	how hard is it to rebuild 1b rochester car Starting to notice my carb is acting up in the morning after releasing the manual choke it putts and once I awhile on very cold days my truck comes and or leaves on a stop putting like if it had a missing fire im also noticing a slight backfire from the float allowing more fuel in it so im wondering if I should attempt a rebuild it myself or send it to get rebuilt since ive never rebuilt a carb and being a tech ive never have fixed one besides replacing or adjusting do to todays modern complexes systems Posted via Mobile Device

01-12-2013, 08:36 AM	#2
RANDY COX Registered User Join Date: Mar 2001 Location: RADFORD, VA Posts: 2,651	Re: how hard is it to rebuild 1b rochester car If you have any Mechanical skills at all,you can do it,there's not alot too them..but if you don't feel comfortable then let the pro's do it... __________________ 1964 BBC 402 4x4

01-12-2013, 10:51 AM	#3
sjarrett71 Registered User Join Date: Dec 2006 Location: Rolla, MO Posts: 2,463	Re: how hard is it to rebuild 1b rochester car Can't be too hard, I did it!! Seriously though, it really is not that hard. Just be sure to follow the directions. __________________ -Scott-

01-12-2013, 11:08 AM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: how hard is it to rebuild 1b rochester car I've done several also. Nothing to them just have dive in. The best thing is that you can't go wrong. If after taking it apart and replacing the parts needed it's still not right, you're not out a lot of money. You also learn how they work and what's inside them. Be sure and get a couple of cans of carb cleaner. Replace all the gaskets. If it's a monojet there's two large phillips head bolts on the bottom you need to remove to replace the middle gasket. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

01-12-2013, 11:12 AM	#5
mikey2409 Registered User Join Date: Dec 2012 Location: Bell Gardens Ca Posts: 151	Re: how hard is it to rebuild 1b rochester car Yeah its a monojet Posted via Mobile Device

01-12-2013, 11:22 AM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,542	Re: how hard is it to rebuild 1b rochester car Might be nothing wrong with the carb. Could be cold intake. Is the heat riser plate working? Here's a link to pics of one. http://advrider.com/forums/showthrea...=653845&page=7

01-12-2013, 02:29 PM	#8
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,542	Re: how hard is it to rebuild 1b rochester car Heat riser is not related to the tcs. Heat riser also isn't an emissions device. It's there to help heat the fuel vapour in the intake when the motor is cold. Cold fuel vapour reverts back to a liquid if not kept warm. Once the intake warms up the heat riser opens. It has a bi-metalic spring on it.

01-12-2013, 02:37 PM	#10
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: how hard is it to rebuild 1b rochester car If it starts running much better after it warms up,then geezer may have solved your problem.Rebuilding it isn't hard at all.I've done a few and you just need to remember to do what the instructions show and that those leftover parts from the kit are suposed to be leftover.The kits are usually designed to cover several versions of the monojet. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

01-12-2013, 03:50 PM	#11
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: how hard is it to rebuild 1b rochester car Check the hear riser but from the first post where you mentioned that it putt, putts after you open the choke, the assumption is that the truck has warmed up sufficiently to not need the choke or heat riser. I don't believe you get the extreme temperatures in your part of Oregon as farther inland or in the higher elevations so the heat riser not working would not affect it as much there. I ran my 68 with the heat riser wired open for years here in Texas with no problems. Winter temps can get down to the low 20's at times. Just have to choke it more. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

01-12-2013, 07:39 PM	#12
Sixteen Tons Registered User Join Date: Aug 2012 Location: BALTIMORE Posts: 96	Re: how hard is it to rebuild 1b rochester car Rebuilt my first Monojet a month or so ago using one of the kits available online. I just took my time, made sure everything was clean enough to eat off and after checking all the calibrations twice, I checked 'em again. From removal to rebuild to reinstall, I would say it's very manageable. And the real payoff was my truck runs a million times better. Good Luck!!



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