C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Valve Guide Seal Question?

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Old Jul 14, 2003 | 05:30 PM
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Default Valve Guide Seal Question?

I just had my Valve guide seals replaced on my 86' because the car was burning oil and blowing smoke every time I started it up and quite often when It sat and Idled, even know the the were less than a year old, but the car sat a while.

Anyway, I just picked up the car and it still smokes exactly the same, the guy said give it a couple of days for all the oil to clear out of the system, and there should be no more smoke in several days, does this sound right? Would it really need a couple of days for the smoke to stop?
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Old Jul 14, 2003 | 05:33 PM
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Default Re: Valve Guide Seal Question? (black86z51)

I don't see why oil would have to clear the system. Oil drips through the seals along the valve stems and into the combustion chamber where it gets burned. New seals should stop that immediately.
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Old Jul 14, 2003 | 05:42 PM
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Default Re: Valve Guide Seal Question? (scorp508)

Should stop smoking almost immediately.

Although if it doesnt, either he did a crap job, or your rings are shot to hell.
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Old Jul 14, 2003 | 05:47 PM
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Default Re: Valve Guide Seal Question? (vader86)

Could also be excessive crankcase pressure pushing oil through the PCV or breather, or an intake gasket split.
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Old Jul 14, 2003 | 05:51 PM
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Default Re: Valve Guide Seal Question? (black86z51)

Could also be your valve guides are worn...so they are oval and no matter how good the seal is, it won't be able to seal the wear.

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Old Jul 14, 2003 | 05:52 PM
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Default Re: Valve Guide Seal Question? (No Go)

Could also be your valve guides are worn...so they are oval and no matter how good the seal is, it won't be able to seal the wear.
Yep, and valve guides are notorious for wearing in L98s.
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Old Jul 14, 2003 | 06:02 PM
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Default Re: Valve Guide Seal Question? (scorp508)

I was thinking the smoke should stop almost instantly. I didn't pay for the job because the motor is still under warranty, I had a feeling it wasn't the valve guide seals. The valve guides are new too. If the rings were bad what would the symptoms be.
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Old Jul 14, 2003 | 06:06 PM
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Default Re: Valve Guide Seal Question? (black86z51)

If the rings were bad what would the symptoms be.
Well you would burn a lot of oil.
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Old Jul 14, 2003 | 06:12 PM
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Default Re: Valve Guide Seal Question? (vader86)

LoL well its does burn alot of oil, any other problems? Is there a clear cut way to tell if it is the rings. Also could a mechanic be confused? Do bad rings and valve seals have similar problems, or is he just tryng to screw me? Thanks Ron
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Old Jul 14, 2003 | 06:22 PM
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Default Re: Valve Guide Seal Question? (black86z51)

if ya suspect the rings you could do a compression test to see if they are letting blow by through... if your car smokes non stop then i would suspect rings or something a little more sever than just valve seals... bad valve seals should only smoke a puff or two a t initial start up and then clear up... :cheers:
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Old Jul 14, 2003 | 10:52 PM
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Default Re: Valve Guide Seal Question? (black86z51)

I agree...something else is wrong. Every time I changed them...the smoke was gone instantly from the first start afterward.

Maybe he put teflon seals in? They do not seal very well on motors with worn valve guides and generally, the only people who like them are bracket racers and wannabe's.




[Modified by BBA, 10:53 PM 7/14/2003]
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Old Jul 14, 2003 | 11:12 PM
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Default Re: Valve Guide Seal Question? (black86z51)

I just changed mine last weekend and I didn't see smoke even on first start-up.......I agree something else is wrong
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Old Jul 14, 2003 | 11:38 PM
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Default Re: Valve Guide Seal Question? (black86z51)

Is there a clear cut way to tell if it is the rings.
Compression check will tell you if something is up.
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Old Jul 15, 2003 | 04:28 PM
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Default Re: Valve Guide Seal Question? (vader86)

skip the compression test and do a leak down test :yesnod:
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