Carbon build up on pistons
 

Just recently I was lucky enough to pick up a 350 short block and two heads for $140. Everything is in pretty decent shape and for the most part this engine looks like all it needs is a good cleaning, which brings me to the pistons. I dissembled the engine and I am trying to clean off the build up of carbon on the piston tops. Ive tried soaking them in degreaser and even mineral spirits. They look alot better but are still covered with stubborn carbon. Any body have any tips on how to remove all the lingering carbon? :huh:

Re: Carbon build up on pistons
 

This stuff is NASTY.

http://forum.ih8mud.com/attachment.p...1&d=1265657819

Re: Carbon build up on pistons
 

oven cleaner works good;)

Re: Carbon build up on pistons
 

When I cleaned the pistons during my last engine build, I used a wire wheel in my dremel. Just have be careful as it will scratch the surface of the pistons.

Re: Carbon build up on pistons
 

Hmmm Ive heard about that chem dip stuff, someone at my shop told me about that. Unfortunately being that my Camaro took a crap on me (that's the reason for the engine) I am going to have to walk to the commissary on base and pick up some oven cleaner. Darn

Re: Carbon build up on pistons
 

Tip: the longer you let it soak without drying out, the better it all works.

Re: Carbon build up on pistons
 

same thing with the oven cleaner-i think i used EZ-off,took about 4 soak/spray off cycles to get the pistons clean as new.

Re: Carbon build up on pistons
 

Permatex Gasket Remover works on everything. It even makes oxidized aluminum manifolds look brand new.

Re: Carbon build up on pistons
 

Damn, I never know so much stuff is good at removing carbon, thanks guys. Maybe I am also a little impatient, I'm sure this process takes time and alot of elbow grease.

Re: Carbon build up on pistons
 

Oven cleaner will do that too. Also works good on the aluminum bed rail caps for trucks.

Re: Carbon build up on pistons
 

Thanks guys, ultimately I used oven cleaner to clean the pistons. Let them soak then used fine grain steel wool and finally rinsed them in water. I think I should be able to get away with this...

Re: Carbon build up on pistons
 

Thats fine what you got there.
Unless its totally disassembled I leave the carbon on. Free compression :D

Re: Carbon build up on pistons
 

Ha Ha, maybe I should scrape some up and put it back on the pistons.:D

Re: Carbon build up on pistons
 

Not sure If it is mandatory to hot tank the block and clean it up...its not too bad

Re: Carbon build up on pistons
 

Those chunks in the eyebrows will chip out with a small dull screwdriver.

Re: Carbon build up on pistons
 

Yeah I'm just trying to be careful with it so I don't scratch the head of the piston.

Re: Carbon build up on pistons
 

As long as its just a very light scratch your ok. Its the skirts,ringlands you don't want to scratch.
Just don't gouge the krap out of it!

Re: Carbon build up on pistons
 

Very true, the face of the piston isn't as load bearing as the skirts are....I think I'm gonna upload some more pictures..I'm trying to get this motor together correctly, but as cheap and quick as possible. I think I'm doing pretty well because I picked up the short block for $140 and the guy said it was rebuilt about 10,000 miles ago. Looks pretty new just has some grime on it.

Re: Carbon build up on pistons
 

Hot tanking isn't necessary if its not too gunked up. When I did mine, I just used a bunch of simple green to degrease the surfaces of it. Then I used my wife's Shark steam cleaner to get in the oil passages(boy, was she pissed when she found out!). I used a cheap set of round wire brushes in various sizes I picked up from Harbor Freight to make sure all the passages were clear, and a set of thread taps to chase all the old sealant out of the bolt threads. It's a very, very messy job.

Re: Carbon build up on pistons
 

Hmmm...I think Ill have to see what I'm working with. I live on base housing so I must be careful how much crap I blow areound the garage/driveway lol