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Decarbon Piston


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#1 HANKG ONLINE  

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Posted April 17, 2016 - 08:05 AM

Has anyone cleaned the carbon build up on a piston top while the piston is still in the sleeve ? I had to pull the head on my 6hp Briggs to bolt on the fuel tank bracket, and noticed build up on the piston top. I am afraid of getting the carbon trapped between the cylinder wall and the piston, any help would be appreciated thanks Hank.


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#2 Tecumseh power OFFLINE  

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Posted April 17, 2016 - 08:16 AM

You have to be careful you can get a piece stuck in the rings. Some atf will dissolve it
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#3 dodge trucker ONLINE  

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Posted April 17, 2016 - 08:42 AM

getting a piece stuck in the rings isn't really an issue, the end gap is the only place of concern, and it is less than 0.020" wide. Your piston to wall clearance should be less than 1/2 of that, and it's "split" all the way around so that brings your possible space for something to fall in at 0.005" (5-thousandth) so not very likely to happen. If it is a heavy buildup I use an air powered angle die grinder with a Roloc pad (looks like Scotch Brite material)   If not heavy, something like Gumout will often dissolve it.


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#4 larrybl ONLINE  

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Posted April 17, 2016 - 08:52 AM

Post #99 here. http://gardentractor...-hulk-ii/page-7

Carb cleaner, small wire brush dremel and scotch brite pads. 


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#5 EricFromPa ONLINE  

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Posted April 17, 2016 - 12:23 PM

I just wire wheel the carbon off with the piston up as far as it will go.Don't put any pressure on it.Let the wheel do the work.

 

Then take your handy pocket knife and scrap the top lip of the bore.Doesn't matter if you scuff up the top of the piston a little.I used to use an old screw driver and scrap it off but a wire wheel does a much better job.

 

Blow out the loose carbon from around the piston once your done and re-assemble.

 

I've been doing this on every engine I have to take apart and never had a problem using a wire wheel.


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#6 LilysDad OFFLINE  

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Posted April 17, 2016 - 12:35 PM

Isn't this what Seafoam is for?


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#7 Chris11 OFFLINE  

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Posted April 17, 2016 - 02:01 PM

anti freeze


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#8 Bill 76 ONLINE  

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Posted April 17, 2016 - 02:41 PM

After cleaning the piston run it down the bore and wipe some oil on the bore then back the piston up and run it back down , most of the crud that fell between the piston and cylinder will stay with the oil and just wipe it out --repeat as needed  


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#9 pharmer OFFLINE  

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Posted April 17, 2016 - 09:04 PM

I just wire wheel the carbon off with the piston up as far as it will go.Don't put any pressure on it.Let the wheel do the work.

Then take your handy pocket knife and scrap the top lip of the bore.Doesn't matter if you scuff up the top of the piston a little.I used to use an old screw driver and scrap it off but a wire wheel does a much better job

Blow out the loose carbon from around the piston once your done and re-assemble.

I've been doing this on every engine I have to take apart and never had a problem using a wire wheel.


Agree. Just did a 6hp Tecumseh this way

Edited by pharmer, April 17, 2016 - 09:07 PM.


#10 MFDAC OFFLINE  

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Posted April 17, 2016 - 09:32 PM

I did this on one of my trucks a year or two ago using a method similar to what Eric did. I was also holding my shop vac right by the piston top while scraping and brushing.

 

DAC


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#11 EricFromPa ONLINE  

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Posted April 17, 2016 - 11:27 PM

Isn't this what Seafoam is for?

 

Might as well dump a little isopropyl alcohol $0.99 @ any drug store and a shot of PB Blaster in instead of paying $7-$8 for a small can of that stuff.lol

 

Seafoam Ingredients
CAS # Wt.%
Pale Oil 64742-54-7 40.00 - 60.00 N/Av >15000 mg/kg >5000 mg/kg
Naphtha 64742-49-0 25.00 - 35.00 N/Av >5000 mg/kg N/Av
IPA (isopropyl alcohol) 67-63-0 10.00 - 20.00 17000ppm 4720mg/kg 12890mg/kg



#12 LilysDad OFFLINE  

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Posted April 18, 2016 - 07:01 AM

Fine, there are cheaper alternatives(What is pale oil?). But, I heard folks saying that after using the stuff for awhile, when pulling their heads, they had no build up.



#13 KennyP OFFLINE  

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Posted April 18, 2016 - 07:17 AM

I'll stick with my Seafoam as I have no way to measure out mg/kg's. It does the job without the hassle.


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