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Old 02-13-2004, 06:19 AM
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crap on top of pistons

What should the top of your piston look like,if everything is running good?I pulled the heads off my 408,they were covered with black stuff,some were only on one side,(left or right)and it wiped off fairly easy.Is this a sign of something wrong or not?

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Old 02-13-2004, 06:26 AM
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It's called carbon and it is a by product of burning petroluem based fuels in your internal combustion engine. It's fairly normal.
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Old 02-13-2004, 06:27 AM
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it's called carbon, this is normal. I would worry if it wasnt there cause that would mean you were running lean and roasting your engine.

Use a de-carbonizer on your engine before you take it apart next time, like G2P, or FTC, etc.
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Old 02-13-2004, 06:29 AM
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Old 02-13-2004, 06:59 AM
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I am in the process of rebuilding my 302, although I never heard this engine run so Im not sure what was going on but I pulled the pistons and there is a ton of carbon build up on the pistons...and I'm talking what looks like 1/16 - 1/8" in some areas... I tried to clean one but it's sutck pretty good. All of the spark plugs are black as well... so was this owner running way too rich? Jeff.
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Old 02-13-2004, 07:05 AM
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Quote:
Originally posted by Sodflyer
I am in the process of rebuilding my 302, although I never heard this engine run so Im not sure what was going on but I pulled the pistons and there is a ton of carbon build up on the pistons...and I'm talking what looks like 1/16 - 1/8" in some areas... I tried to clean one but it's sutck pretty good. All of the spark plugs are black as well... so was this owner running way too rich? Jeff.
Dip them in kerosine for 24hrs and turn them every couple of hours, works wonders.
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Old 02-13-2004, 09:35 AM
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Some carbon build-up is normal. Don't confuse the issues here though. One is talking about typical carbon build-up and another is talking about massive build-up. I would bet the 302 with massive carbon was due to burning oil, this is not normal or good.

I run a fuel treatment made by Amsoil a couple of ounces every fill up and it highly reduces the carbon on the valves and pistons. The gas these days is pretty crappy and that has a lot to do with it.

Royce
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Old 02-13-2004, 05:44 PM
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If all the pistons are like that it is normal. If you find one or two that are completely clean that is bad. I had a bad ring on an old 307 were it was like that. That cylinder would foul the plug and stop firing. The unburnt gas cleaned the piston top.
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Old 02-17-2004, 09:12 PM
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While tearing down a 351w out of an 86 crown vic, a friend and I found sunflower seeds on top of all the pistons... I seriously doubt thats normal.

Yeah, the car had been sitting for about 10 years.. but sunflower seeds on top of a piston? Yeah.. thats a little too weird for us.


A little info... the guys 19 and only wanted the block... hes buying every thing else new, so we just tore it apart for a learning experiance. The motor, when rebuilt, will sit under the hood of his '95 ranger. Should look mean, since the ranger is already laying body.

Okay, time for the lurker to go back to lurking.
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Old 02-18-2004, 01:43 PM
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It's a good thing it's going inot a pickup. That gives him an easy way to haul the required sunflower seeds.
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Old 02-22-2004, 05:40 AM
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"Crap on top of pistons"

How often do I have to do that?


Seriously, I agree with everything that lluciano77 said. Modern engine emission control systems are renowned for causing this too. Well, those on European cars anyway!!
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Old 02-22-2004, 06:27 PM
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You should do that everytime you fill it up.
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