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Old 10-17-2012, 11:27 PM   #1
-] Kenpachi [-
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Default Burning oil! Changing ring advise!!!

Hi, my subaru forester 2002 is burning oil and you can see it true the back window while driving. The head gasket has been changed and the valve/seal. So I guess my rings are done. Can I change them without changing the pistons and doing anything to the cylinder sleeve or should I. And without splitting the cassing.

What do you guys thing about this?
What would you recommend me?

I never opened an engine before an I want to do this quick because I need the car bad. But I want to do it properly.

Max
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Old 10-18-2012, 12:05 AM   #2
RaceFaceXC
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Quote:
Originally Posted by -] Kenpachi [-
Hi, my subaru forester 2002 is burning oil and you can see it true the back window while driving. The head gasket has been changed and the valve/seal. So I guess my rings are done. Can I change them without changing the pistons and doing anything to the cylinder sleeve or should I. And without splitting the cassing.

What do you guys thing about this?
What would you recommend me?

I never opened an engine before an I want to do this quick because I need the car bad. But I want to do it properly.

Max
Was it smoking the same before you did the valves/seals? Were the guides also done with the valves/seals?

If the rings are the culprit they can be done without splitting the case but you really should hone the cylinders if you change the rings or they probably will not seat very well. And to do that properly you need to split the case. And after honing to round you may need oversize pistons. If you split the case with that many miles in it you might as well do bearings... You see where this may lead. But you could be fortunate and things are still in good shape so just aring job will last several thousand more miles. you never know
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Old 10-18-2012, 12:17 AM   #3
-] Kenpachi [-
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Well I just bought the car. And that's what the owner told me. So I'm kind of stress now. With what your telling me. Everything is running smooth. Only a lot of smoke from oil burned when I step on the gas. And he showed me his receipts. Do you think I could fix it on my own pretty quick. I'm OK with mechanical parts. I opened up my rsx-s k20a2 tranny and changed the final drive an LSD on my own with no knowledge. I never touched a subaru engine before. I only hope it won't cost me a fortune
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Old 10-18-2012, 07:39 AM   #4
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How much about is it going to cost me to hone the cylinder?
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Old 10-18-2012, 08:52 AM   #5
RaceFaceXC
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Contact a local machine shop and tell them what you need. They will have to measure the bore and see how round it is then they can tell you about what size it will be after they hone it back to perfectly round. Then you will know if new pistons will new needed.

I don't have an estimate for you on cost but if you do the disassembly and cleaning it will reduce your cost.
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Old 10-18-2012, 09:28 AM   #6
-] Kenpachi [-
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Thx raceface
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Old 10-18-2012, 10:46 AM   #7
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Do a compression test to see if it's one cylinder or all. Although as long as the engine is out...may as well do them all. You can also remove the header and see if there's any oil in any 1 cylinder, which would indicate a valve seal problem. Just because they were done recently doesn't mean they were done right.
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Old 10-18-2012, 11:30 AM   #8
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OK that could be nice. This means it could be cheaper and easier to do.
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Old 10-18-2012, 11:56 AM   #9
-] Kenpachi [-
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Any ruff guess on how much changing a valve seal could cost me at a shop?
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Old 10-20-2012, 03:59 PM   #10
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OK so i drove over 2 hours today. And this is what I notice. Drive on the hi-way. Not to much oil burning. Stopping at a light and waiting 5 minutes and then driving = a lot of blue'ish smoke.

So the smoke occurs to form while resting in place and then burning the excess while driving. Anything that could help me discover the issue with my engine.
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Old 10-20-2012, 04:26 PM   #11
Counterfit
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I believe that's a symptom of a leaking valve guide, but take that with an unhealthy dose of salt.
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Old 10-20-2012, 04:33 PM   #12
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OK, and can someone else confirm that. Cause if its this I will try to do myself.
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Old 10-20-2012, 05:14 PM   #13
Counterfit
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Here's what I found on eHow.
Quote:
Idle and Stop and Go Driving

Bad valve seals will show themselves during prolonged idling at stop signs or stop lights in congested city conditions. When the vehicle sits at idle for prolonged periods, high levels of vacuum at the intake manifold result because the throttle valve remains closed. The high vacuum attracts oil in the heads to congregate around the valve stems. Upon acceleration, the oil gets sucked past the eroding seal and down through the valve guide, where it burns in the exhaust. Huge clouds of blue-white smoke exit the tailpipe after each acceleration from a stop. The burning smoke will disappear during cruising or highway speed.
Granted, none of the various forum threads (some Camaro/Firebird forum, Honda-Tech, bimmertech) mentioned anything other than smoke on startup, but I only spent a little bit of time looking.
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Old 10-20-2012, 05:35 PM   #14
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Thanks a lot Counterfit. Awesome find. Now I can start looking for the DIY haha.
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Old 10-20-2012, 07:16 PM   #15
Counterfit
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I wish my Google-fu was as strong when searching for my own problems.
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