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Unread 03-03-2013, 08:56 PM   #1
Mlaughlin8
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1980 CJ5 
 
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Location: Austin, Texas
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Gushing white smoke but runs fine?

I just got my 258 back in my jeep after a rebuild... Mechanic that rebuilt it for me said that the weber carb that is on it is almost shot and the fuel pump was bad so it dumped a lot of fuel into the block... Now it gushes white smoke! He tells me that he cleaned up the carb and replaced the fuel pump. He also is telling me that I need to just put some miles on it and the smoke will clear up. Is this true? He said the engine just needs to work out the fuel that is in the rings and seat themselves. I asked why all of this? And he said that everything went well with the rebuild, the carb is tuned good and the timing is spot on. Should I be worried or should I just drive it ? How long should it take to clear up???

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Unread 03-03-2013, 09:06 PM   #2
smokeone
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1985 CJ7 
 
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I would be checking the oil for water. Also check antifreeze for oil. Sounds like bad head gasket. My brothers ran great but the gasket was bad from cylinder to water jacket. Combustion gas was getting in the antifreeze. It sounds likes yours is burning antifreeze. What does the exhaust smell like. If its a sweet smell it antifreeze.
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Unread 03-03-2013, 09:13 PM   #3
brownbagg
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they do use a lot of oil on rebuild and that has to burn off but that just a couple minutes
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Unread 03-03-2013, 09:24 PM   #4
Mlaughlin8
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It doesn't smell bad at all, just white smoke. Head gasket was replaced head was redone. No oil in antifreeze coolant is fine. It also blows smoke out of the pcv breather out the top too. He said the oil was really thin due to all the gas in it but he changed the oil and filter. The compression is good on all cylinders also. So far it only has about 10-15 miles on it since I got it back. Could it be that I just need to put more miles on it and let it clear up itself?
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Unread 03-03-2013, 09:33 PM   #5
muddigger95
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How many miles you have on the rebuild. Does the smoke smell like flooding, or burnt oil. Is there excess water commingle out of the tailpipe. If you don't have oil in the water, or the other way around. The way I was thought to seat rings, is to put it in first gear while driving down the street or lonely highway. Take it in gear, slowly up to 4000 rpm and let up til it come to a rolling idle do that 5 or 6 times and that will seat the rings. The break in period after that is about 500 miles. I've also heard another way to do it, is you should drive 35 MPH for 20 min. 45 for 20min 55, 65, this will also break them in. Also keep an I on your oil level. Or drive like you stole it if its under warranty, if it comes apart , its not your problem if he said your engine was fine.
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Unread 03-03-2013, 09:44 PM   #6
muddigger95
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If you only have 15 miles on it, you probably have not even burned off the assembly lube yet. From what you just described. It sounds to me as though you need to seat the rings as I explained before.
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Unread 03-03-2013, 10:10 PM   #7
Mlaughlin8
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Ok I'll try that! Thanks, I guess I needed someone else to tell me that so I can believe it. It sounded kinda weird when he told me all of this but ok... Ill just drive and put a bunch of miles on her. Thanks
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Unread 03-03-2013, 10:43 PM   #8
jblue1555
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1979 CJ7 
 
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I dont think the engine was rebuilt. If it was why would he be told it had gas and oil in the rings that had to be burnt out?
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Unread 03-04-2013, 01:50 AM   #9
Matt1981CJ7
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I think your mechanic is feeding you plate of crap.

My rebuild never gushed white smoke, and I've never heard of it being normal.

I would not drive it until you find the problem.

Matt
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Unread 03-04-2013, 03:39 AM   #10
chooster5000
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My rebuilt 258 don't smoke at all, something don't sound right. I broke in my new cam for 20 minutes at 2000 rpm and everything is fine except a oil leak, all my rings seated and it runs awesome, I would replace the carb if it's a pos and maybe look for a different mechanic. I wonder if he sprayed the head gasket with copper coat that stuff helps seal a lot never had problems with it.
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Unread 03-04-2013, 09:44 AM   #11
Mlaughlin8
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Apparently the motor didnt smoke at all right when he put it in but something then went wrong with the pump and it and the carb dumped fuel into the block... Then made the oil super thin so he changed oil and filter.starts and Idles good and when warms up it runs good just smokes like a train. I can tell that gas is in exhaust due to a drip from tailpipe.
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Unread 03-04-2013, 09:45 AM   #12
Mlaughlin8
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Could it be just a bad carb???
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Unread 03-04-2013, 09:58 AM   #13
Matt1981CJ7
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I'm leaning towards a head gasket failure.

That's about the only thing I can think of that would cause an engine to blow white smoke "like a train".

You can pull your radiator cap, then remove one plug at a time and blow compressed air into the plug hole. If you see bubbles in the coolant, you've isolated the leak.

Sorry, I know that wasn't the answer you were looking for.

Matt
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Unread 03-04-2013, 10:03 AM   #14
timgr
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Drip from the tailpipe is likely water. White smoke is water. Too much gas is black (carbon), and oil is blue.

Matt has the right approach. Cooling system pressure test.
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Unread 03-04-2013, 11:48 AM   #15
jblue1555
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Im sorry I didnt catch it was a post rebuild problem. if you have a manual trans, then you must have a head gasket leak or an exhaust system full of moisture . If you have antifreeze in it and the head gasket is leaking the exhaust will smell sweet and if you pull the plugs the real clean one will be the cyl. with the leak.
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