Carbon Buildup Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

joeymarkgraf · 06-02-2008, 02:28 AM

Hey folks,

I just finished pulling off my stock intake manifold to put on an aftermarket one, and I've discovered quite a bit of carbon buildup. (Thats what I think it is anyway.) I've been trying to clean up as much of it as possible, but It seems to be quite heavy inside one of the intake ports, which is circled in red. It this going to cause me any huge problems? It seems like it could be a result of worn rings, but I only know enough to be dangerous to myself...

Will it be ok to use my shop vac and a screwdriver to chip as much of it off as possible? I'm not looking to spend the $ on rebuilding the engine, but I'd like to do as much as I can while I have it out of the pickup and in my garage.

Any help is appreciated!

MylilBowTie · 06-02-2008, 09:05 AM

Screwdriver and shop vac is fine to clean it up. Lay a few paper towels down in the lifter valley. That will help to keep the grit getting into the oil pan. Make sure after you are done to wipe it out really good. I would leave the shop vac on while slowly picking away at the build up. Ice pick or and owl will work well also.

MylilBowTie · 06-02-2008, 09:07 AM

Oh yeah since it looks like you have the valve covers off. Clean the oil returns if they are sludged up.

**old Rusty C10** · 06-02-2008, 10:37 AM

just be very careful to get all the crud out of the engine before you button it back up

BLE 'BURBAN · 06-02-2008, 11:17 AM

Quote:

Originally Posted by LONGHAIR

Inside that red circle is not an intake port. That is the exhaust heat cross-over. It is there for two reasons. It helps to speed the warm-up process by allowing exhaust heat to run under the intake manifold. Also, more importantly, it heats the choke pull-off coil of your "divorced choke" style carburetor.
Many "hi performance" intake manifolds block these passages.

Be careful about cleaning and everything should be ok. Holding a shop vac close while chiping at it is helpful, but I would cover the lifter valley with towels anyway.

It is also the same port that feeds your EGR valve.

joeymarkgraf · 06-02-2008, 12:59 PM

Quote:

Originally Posted by BLE 'BURBAN

It is also the same port that feeds your EGR valve.

Thanks for the help guys! I'm carefully cleaning out the gunk, taking care not to knock anything down into the rod valley or further into the engine. I'll post some pictures of the cleaned up project when I finish.

LONGHAIR · 06-02-2008, 04:17 PM

Inside that red circle is not an intake port. That is the exhaust heat cross-over. It is there for two reasons. It helps to speed the warm-up process by allowing exhaust heat to run under the intake manifold. Also, more importantly, it heats the choke pull-off coil of your "divorced choke" style carburetor.
Many "hi performance" intake manifolds block these passages.

Be careful about cleaning and everything should be ok. Holding a shop vac close while chiping at it is helpful, but I would cover the lifter valley with towels anyway.

BLE 'BURBAN · 06-02-2008, 07:45 PM

Okaaayyyy........ How did my post with a quote from longhair end up getting posted as the 5th post while Longhair's is the 7th posting!!?!?!!?!?

LONGHAIR · 06-02-2008, 08:07 PM

The "board time" has been re-set since the fire, so things are not chronological....It will take a few days for the new posts to settle this out.

It says that I made that post at 4:17 this afternoon, but it was really yesterday. I didn't even get home until after 6:00. I have seen several posts like that this evening.

joeymarkgraf · 06-02-2008, 08:51 PM

Quote:

Originally Posted by BLE 'BURBAN

Okaaayyyy........ How did my post with a quote from longhair end up getting posted as the 5th post while Longhair's is the 7th posting!!?!?!!?!?

Somebody broke the Flux Capacitor... Was the board outage due to the Texas data center explosion?

06-02-2008, 02:28 AM	#1
joeymarkgraf Registered User Join Date: Dec 2006 Location: Corvallis, OR Posts: 47	Carbon Buildup Problems Hey folks, I just finished pulling off my stock intake manifold to put on an aftermarket one, and I've discovered quite a bit of carbon buildup. (Thats what I think it is anyway.) I've been trying to clean up as much of it as possible, but It seems to be quite heavy inside one of the intake ports, which is circled in red. It this going to cause me any huge problems? It seems like it could be a result of worn rings, but I only know enough to be dangerous to myself... Will it be ok to use my shop vac and a screwdriver to chip as much of it off as possible? I'm not looking to spend the $ on rebuilding the engine, but I'd like to do as much as I can while I have it out of the pickup and in my garage. Any help is appreciated! Attached Images Last edited by joeymarkgraf; 06-02-2008 at 03:26 AM. Reason: Made picture bigger

06-02-2008, 09:05 AM	#2
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: Carbon Buildup Problems Screwdriver and shop vac is fine to clean it up. Lay a few paper towels down in the lifter valley. That will help to keep the grit getting into the oil pan. Make sure after you are done to wipe it out really good. I would leave the shop vac on while slowly picking away at the build up. Ice pick or and owl will work well also. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

06-02-2008, 09:07 AM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: Carbon Buildup Problems Oh yeah since it looks like you have the valve covers off. Clean the oil returns if they are sludged up. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

06-02-2008, 10:37 AM	#4
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,297	Re: Carbon Buildup Problems just be very careful to get all the crud out of the engine before you button it back up __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

06-02-2008, 04:17 PM	#7
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Re: Carbon Buildup Problems Inside that red circle is not an intake port. That is the exhaust heat cross-over. It is there for two reasons. It helps to speed the warm-up process by allowing exhaust heat to run under the intake manifold. Also, more importantly, it heats the choke pull-off coil of your "divorced choke" style carburetor. Many "hi performance" intake manifolds block these passages. Be careful about cleaning and everything should be ok. Holding a shop vac close while chiping at it is helpful, but I would cover the lifter valley with towels anyway.

06-02-2008, 07:45 PM	#8
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: Carbon Buildup Problems Okaaayyyy........ How did my post with a quote from longhair end up getting posted as the 5th post while Longhair's is the 7th posting!!?!?!!?!? __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

06-02-2008, 08:07 PM	#9
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Re: Carbon Buildup Problems The "board time" has been re-set since the fire, so things are not chronological....It will take a few days for the new posts to settle this out. It says that I made that post at 4:17 this afternoon, but it was really yesterday. I didn't even get home until after 6:00. I have seen several posts like that this evening. Last edited by LONGHAIR; 06-02-2008 at 08:09 PM.



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