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12-07-2013, 11:37 AM
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Join Date: Oct 2013
Location: Morocco, IN
Posts: 77
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Cleaning Carbon out of Cylinder Head
Rebuilding a fairly low time O-320. Wondered if anyone had a trick tool for cleaning carbon deposits in combustion chambers, with the cylinders off the engine. On automotive heads I've used wire wheel and scotchbrite wheels. With the attached cylinder configuration of aviation heads it a little harder.
Any insights on tools or chemicals that help out?
Thanks,
Rob
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12-07-2013, 11:54 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Try using a gun powder solvent like Hoppes #5. I think that is the name of it.
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RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order. 
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12-07-2013, 12:06 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-07-2013, 12:29 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Quote:
Originally Posted by Geico266
Try using a gun powder solvent like Hoppes #5. I think that is the name of it.
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I think it is #9, not 5??
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-07-2013, 02:07 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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Hoppes won't touch carbon buildup. In fact I find it barely usable on guns. Like the smell though for some strange reason.
Nothing the average consumer can buy from an auto parts store will soften carbon deposits. Been there done that.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-07-2013, 03:53 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,515
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Quote:
Originally Posted by rocketbob
Hoppes won't touch carbon buildup. In fact I find it barely usable on guns. Like the smell though for some strange reason.
Nothing the average consumer can buy from an auto parts store will soften carbon deposits. Been there done that.
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Bob,
Maybe the grocery store . .
In my former employers' development lab, the fuel systems guys used a detergent bath heated to 180F. They used a fancy product, but said they would use Wisk mixed rich with water too when they ran out. It would soften and break loose the diesel combustion carbon deposits on injectors, even in the orifices. I tried this on some parts at home and and it easily cleaned the varnish from lifters, connecting rods etc. It smells up the kitchen.
I might be concerned about aluminum, though, due to the resulting pH. No help to the OP in that regard. YMMV.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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12-07-2013, 04:35 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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There are lots of detergents that will work but what effect do they have on the aluminum...that's the thing. Simple Green should work but I'm not sure I would use it. In the shop I have the PPG product and I put whole cylinders in a turkey fryer pot I throw on the stove for a couple of hours, and that usually gets things nice and clean.
__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-07-2013, 09:22 PM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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I have used a heated ultrasonic bath with mild dish soap solution for 15 minutes, then used walnut shell or plastic media in a blast cabinet. Use as mild a solution and as little pressure as possible to accomplish the job.
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Good judgment comes from experience, and a lot of that comes from bad judgment.
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12-08-2013, 12:47 AM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Post some photo's!
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David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
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12-08-2013, 01:28 AM
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Join Date: Sep 2013
Location: Sydney, Australia
Posts: 16
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WD-40 and scotchbright. worked a treat decarboning my old 2 stroke rotax pistons and head.
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