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Old 04-21-2011, 07:14 PM
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Serious engine problem, or just normal after a rebuild?

Alright, the engine is a '1967 straight six 250CID, and it was rebuilt COMPLETELY about 35-50 miles ago by me. I was doing something with the timing today and needed to remove the #1 sparkplug. I did, and I noticed it had a tiny bit of oil on it. I got my flashlight and looked down through the hole and saw what I believed to be just regular carbon, but it looked moist. I stuck something into the hole and rubbed it against the piston and found it to be oil. The recess in the piston has a little pool of oil on it.
When the truck runs the exhaust is constantly emitting a decent amount of white exhaust and has a small condensation drip, not black like it would be if it was burning large amounts of oil. I checked the oil and apparently it's slightly overfilled, (about .25 of an inch past full on the dipstick) not sure if this could cause it. So here are my questions:

Should this really be nothing to worry about since the engines relativley new, having only under 50 miles on it and not completely worn in? Could it be that theres slightly too much oil? Or are my piston rings for some reason already letting the oil by? I listed everything I could to help you guys help me. Thanks as usual!
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Old 04-21-2011, 07:20 PM
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Did you off-set the rings when you installed them ? And what does the other cylinders look like is it just the one or more ?


Cole
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Old 04-21-2011, 07:22 PM
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I wouldnt worry much about it unless its smoking badly or has excessive blow by. Id give all the rings and seals a bit of time to seat before giving it to much concern.
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Old 04-21-2011, 07:23 PM
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I haven't looked in all of the others yet, could you explain what you mean exactly by offsetting them? It has a steady bluish-white smoke for a while. I can't remember if it goes away after driving because I dont drive it much, but I think it does.
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Old 04-21-2011, 07:34 PM
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Just wondering if they were installed correctly and if you lined the gaps up or if you off-set them, your supposed to turn the gap away from each other.
But i do agree with the above post drive it for a bit let things seal off it hasen't had enough miles/time to seat yet. IMHO


Cole
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Old 04-21-2011, 07:36 PM
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Offset the ring end-gaps. Or are they all lined up. Only 50 miles on it? I wouldn't worry until you get 400-500 miles on it...longer if you use chrome moly or other moly rings. It takes a while for the rings to seat. Have you broken the cam in, changed oil and filter, and refilled with conventional oil with a zddp additive? I would run it and monitor it. If it still does it after about 300-400 miles I would look into a leak-down gauge. If that shows fine. I would suspect valveguides and/or valve seals. Good luck to ya!
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Old 04-21-2011, 07:37 PM
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Yes, I did offset them then. I followed the Haynes manual's guide to set all of the gaps in the proper different directions. Thanks for the responses so far guys.

@CJ
I broke the cam in as per instructions and proper method, changed oil & filter after break in to Castrol Syntec 20W-50 formulated for classic vehicles w/flat tappet cams so I've got the ZDDP covered. Used regular sealed power rings.
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Old 04-22-2011, 03:56 AM
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Run it for a few hundred miles and see if it improves (or gets worse). You're not going to do any damage by continuing to run it. Hopefully, it's just blow-by due to the rings not bedded-in yet. Otherwise, it could be a valve stem seal.

Is it just on #1, or are other cylinders showing oil ingress too? If this is due to the rings not being bedded-in yet, I'd expect to see similar amounts of oil in the other cylinders too. If it's just on #1, I'd suspect the exhaust valve stem seal (broken or adrift) as being the most likely cause. Actually, on that topic, have you installed stem seals on the exhaust? Some people leave them off, which will inevitably lead to some oil passing down the guide.

The white smoke and condensation drip is normal if the engine is not fully warmed-up (esp. if the outside temp is cool). If you get white smoke and water dripping from the exhaust with the engine hot, you could have other problems. If this is the case, check the oil for any signs of coolant contamination (mayo) and the coolant for any signs of oil contamination. Did you use sealer on the head bolts?

Finally, don't over-analyse and get paranoid (I'm the master of doing that!) Relax, run it and see what happens.
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Old 04-22-2011, 05:06 AM
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Look at the other holes. I don't think it is normal, even for a fresh engine that's not broke in. I would be more likely to suspect you didn't get the valve seals on properly.
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Old 04-22-2011, 08:26 PM
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Yeah I used Permatex (#2?) on the head bolts. The proper sealer stuff, not sure if it's #2. But today I drained a little bit of the excess oil, no mayo so the head gaskets fine. Coolant is still coolant, no oil/coolant mixture. Checked the rest of the cylinders, they all have the similar little puddle of oil. Hopefully draining the excess oil will help a bit. We'll have to see tomorrow.
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Old 04-22-2011, 11:06 PM
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There is another possibility when you find oil. If the bottom of the intake manifold is not sealing to the head port, then on the intake stroke, the piston can pull in oily vapors from the crankcase. This is an internal vacuum leak that you'll never find with conventional leak detection methods. Read here please....
http://www.crankshaftcoalition.com/w...al_vacuum_leak
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Old 04-23-2011, 10:40 AM
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Quote:
Originally Posted by techinspector1
There is another possibility when you find oil. If the bottom of the intake manifold is not sealing to the head port, then on the intake stroke, the piston can pull in oily vapors from the crankcase. This is an internal vacuum leak that you'll never find with conventional leak detection methods. Read here please....
http://www.crankshaftcoalition.com/w...al_vacuum_leak
its a straight 6 not a V8
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