oil change gone bad

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freakboy

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well we went to change the oil in my freinds kart the other day. nothing new i can do it with one hand. well we drained the oil it was all gunky and nasty and there wasnt much in it. so then we filled it up with the recomended oil freaking 15w 30 or 15w40 one of the two non synthetic. and we fired it up and we filled his garage with smoke.....how the hell we screew this up its burning oil really badly and when i checked the oil to make sure its not overflown its pitch black like wtf..... it ran fine before the change of oil and the new plug wire i dont think that could be the problem.

so what the heck is wrong with this thing? my guess is some of the oil was where it wasnt suposed to be and the new stuff losened it. i told him change the oil again but i think hes to lazy...so if someone wants to back my theory up or throw some more ideas out there.. btw this is a chinese pos 150 cc engine in a tomberlin cross fire kart
 
freakboy

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its recomended on the little parts list on the gas tank its ment to run high octaine gass 93 i think.
 
t0x1k

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Oil just doesn't go pitch black withing a few minutes. You had to have some old oil somewhere. Like the OHV area or something.

Burning oil is 3 things, bad rings, bad valve seals, and over filled.
 
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Affair_driven

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Multi-grades tend to burn off faster as well as gunking up rings, ring lands and cylinder walls. Many manufacturers do not recommend multi-grades for that reason.
Tecumseh, and probably some others, will void warranty if 10-40 is used.
By your description, sounds like stuck or broken rings.
Further diagnosis is required before tearing into it.
 
freakboy

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Im thinking he really screewed something up in it. because the thing was really smoking more then a overflow would cause and the oil level was around 3/4 so it couldnt of overflowed. so i think he either needs to drain the oil out and put new in. and if that doesnt work i get to rip it apart but its one that hangs and is really freaking in there.... i hope i dont need to tear it down, u need to rip the hole rear end out the axles and EVERYTHING.
 
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porsche930dude

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how long did you run it? if you had it tipped over or something it probrobly just filled the carb or muffler with oil. Just run it for a while i bet itll clear up
 
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porsche930dude

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EagleTalons said:
15W 40 is what Diesels use. I'm at a loss to what could have went wrong...
Click to expand...
Thats what i use in my air cooled porsche 911. That grade is also recommended in alot of air cooled motorcycles. As for the black oil in a few minutes. If there was enough sludge left over coating the inside of the engine its easily possible
 
residentg

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my guess is that the old oil was sludge to the point that it clogged the drain hole. That is why not much came out. You then filled it with new oil, but since there was still a bunch of old oil in the crankcase, you in a sense, overfilled it. When you started it up, the excess oil blew by the rings, hense the smoke.

Change the oil again, if it is really bad, run some kerosene through the cc, and then change the oil 2 more times to get the kerosene out.

Change the oli on a regular basis to avoid this.
 
toofarnorth

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I know someone that would run their worn out engines with almost no oil in them because if they fill it to the correct level they smoke from oil getting past the rings. you'd think the engine wouldn't last too long like that but he ran it for 2 weeks 12 hours a day that way and it was just barely starting to knock when he replaced it, Hondas are awesome.
 
THE HUNTER

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residentg said:
my guess is that the old oil was sludge to the point that it clogged the drain hole. That is why not much came out. You then filled it with new oil, but since there was still a bunch of old oil in the crankcase, you in a sense, overfilled it. When you started it up, the excess oil blew by the rings, hense the smoke.

Change the oil again, if it is really bad, run some kerosene through the cc, and then change the oil 2 more times to get the kerosene out.

Change the oli on a regular basis to avoid this.
Click to expand...

that sounds possible.
i know an old engine i had had a lot of sludge in the oil sump and after an oil change the oil would get black quickly. i think it was a 1950s Wisconsin on a roto-tiller, LOTS of use on it, even with proper oil changes, it built up a fair amount of sludge. (older oils didnt have as much sludge protection as modern ones, and was only used for a day or two out of the year for a long time.)
so if the owner of the engine you are having probs with abused it like you are saying (i know ppl like that), residentg's idea is deff worth trying.
 
freakboy

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This kid abuses the crap out of everything he blew his engine in his blazer he didnt bother fixing it when it started to knock so he just kept at it blew it and i wonder what else he did to the damb thing.
 
freakboy

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idk all i know its beat to crap. he has 500 acres to romp on and one day like a year ago we were driving it around and rolled it twice then fliped it back over then kept goin and since its air cooled goin through the woods really cooks the freaking thing.
 
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