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smoking problem found.... maybe

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Make sure they cut your guides for possitive lock seals (the kind that has a spring/clip on them). I feel sure this is your oiling problem. I would also make sure that you have good drain back from the heads so oil can not puddle up. The new guides will also help your valves keep a good seal on the seat as time goes by, with a little slack when you turn the RPMS the valve can lose a bit of seal and not hold the comnpression good, so your investment in the guides is a good one and will pay off in time.

I really doute the marks you see in the cylinder are causing problems. If you dont mind taking the engine back out if there turns out to be a problem then I would try it the way it is. But the best possible sollution would be to take it apart. If I took it apart I would get it Plate honed and put new rings in. It is alot of work you have been threw and this would make things right for sure. But it depends on if your time or your money is worth more to you. If your tight on money slap the new heads on and give it a try. But if you tear into the block , DO It Right. One thing, if your rings was giving you problems I think you would have seen the results on your plugs.


Jess
 
Rick87GN said:
Your saying an upsidedown ring on a piston would cause oil in the intake?
Click to expand...

Sorry to respond so late Rick. But yes, it will somehow cover the entire intake innerds with a coat of oil. Up to the rear of throttle blade. And Obrut, upon pulling heads, an unpside down ring will give itself away by a wet oily piston head. Of course this if its a ring and not a head problem specific to that cylinder.
Good luck
 
ThikStik said:
But yes, it will somehow cover the entire intake innerds with a coat of oil. Up to the rear of throttle blade.
Click to expand...

If that's been proven then every passenger car and light truck in the World with port fuel injection has upside down rings in them.
 
Alot of oil. And it has been proven implicitly, by me. Yes, I know that all intakes and that includes all fueling sorts, have other than perfectly dry/clean inner surfaces. Again...with ring upsiede down, its ALOT of oil all over insides and amazingly distributed. I dont think a ring is Obruts' problem though.
 
built-rite engine rebuilders. I use them for regular machine work. they are in lombard near i355 ask for bill 630-629-4021. when i was there he had some buick engines that a guy road races with. He will be doing my motor. :biggrin:
 
well i,ve been doing more research and talking to more people. My fathers buddy suggested a machine shop to use. I called them and talked to the guy and he seemed pretty good. I stopped there after work today with my heads and was impressed with his shop, very clean and orginized which is a good sign. After explaining my problem to him he starting checking out my heads. He took me into his shop and measured some valves and guides right in front of me. He said that the guides didn't look to bad but they did have some slop in them. He also told me that this probably wasn't my smoking problem but suggested having the heads done anyway. The first time i had the heads done the guy told me (different guy) he put all new guides in. He didn't these were my factory 90000 mile guides. So this guy tells me that i could have a ring problem. I told him that some have suggested that the oil rings were in upside down. But he told me that they can go either way? He told me that the problem could be that the oil rings might be the wrong ones and they don't have enough pressure to clean the cylinder walls. He also told me that if the two rings on the oil ring were lined up that this would cause a problem as well. Can some explain what these oil rings look like? Is there an up side and a down side on these? He told me i should pull a piston and take a look. He also said that i could bring that piston in and he would check it out.
 
It looks like the oil is coming from around the valve stem and guides. It would seem if the rings were a problem there would be oil everywhere in the ports.

leakingseals.jpg
 
well my heads are almost done and i think i might just buy new rings since i'm this far. I mean i've done everything else twice on this car i might as well be consistent. My post thats two up from this one i had a link to another post about piston rings. I have a stock bore and stock pistons, which rings should i use? Can someone explain the 1/16 1/16 and 3/16 thing to me? is that for the oil ring? What was the stock oil? It might be possible that the guy built the engine with low tension oil rings i'm not sure.
 
It almost looks like there is porosity in the casting or something, but the oil is probably just migrating around. And per my previous post, I dont think its ring install problem. That staining looks like it didnt burn a whole lot, but that it would be at idle and decel. Did u have a single piston that looked oily? If not , i say rings are def not problem. Valve smoke will hardly wet the pistons, but rings will. (dont blame u for checking pistons though)
 
Don't you think you should check the bearings too. Rings and bearings are cheap. I would just do them both.
 
hmm, I think someone suggested valveseals and or guides months ago. oh yeah, that was me:biggrin: good luck and keep us posted
 
obrut,

Sorry to bring this back up but was there a solution to your problem without rebuilding the entire drivetrain?
 
i was going to give an update anyway. Here is where i'm at, the heads have been redone and the machine shop said that there was nothing they saw that would cause a smoking problem like i had. They said that i might have low tension oil rings which would cause the smoking problem that i'm having. So I just dropped the short block off last saturday. The machine shop is going to tear it down and check all the bearings and rings and replace the oil rings with standard tension rings. This is the plan for now, they are going to call me if the find anything else wrong with it. So i guess if the heads are not the problem and the turbo is fine the only other thing would be the rings. I will post another update after they call me if a few days.
 
here is another update, the machine shop checked my block and found that the piston to cylinder wall clearance is to much. So it looks like i'm going to have to get new pistons.
 
All you would have needed was to install exhaust valve seals. Been there before. Piston wall clearance has no effect on ring seal.
 
just got my short block back yesterday. When the engine builder ordered rings he asked if the ring kit used standard tension oil rings. the supplier said that they come with low tension rings as stock replacements and the standard tension rings need to be requested. Maybe thats why people have smoking problems after rebuilds?
 
well i'm finally getting ready to put this all back together. I ordered some 9441PT heads gaskets and bought some permatex thread sealant with teflon for the head bolts. I'm going to post as i'm building so please any tips along they way would be great. I'm hoping that after its done and it runs its right, with everything i've gone through on this car it should be.

Any tips about new gaskets and bolting the heads down?

Tim

I wanted to add a pic of the stock pistons one is missing its still at the machine shop, this is what they looked liked after about 2500 miles. Also there is a pic of the new pistons in the block. I hope that all the crap that i have gone through will possibly help someone with their smokeing problem.
Yahoo! Photos - pistons
 
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