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Case Tractors Discussion Forum

Will poor valve seals cause blue smoke?

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Gary J

07-28-2003 15:44:06

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I had my 580CK head rebuilt and now the engine is using oil and smokes. If the valve seals are bad could this be the problem? The engine is running great compression.

When I picked up the head the guy doing the job showed be what looked like O rings he said was the seal used on the 159G engine.

If I remember other engines use a bell looking seal which slid down the valve stem and over the tower on the head. Was this guy correct on the type of seal for this engine?

Thanks, Gary

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Klyde

07-29-2003 04:59:14

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Re: Will poor valve seals cause blue smoke? in reply to Gary J, 07-28-2003 15:44:06

Does it smoke all the time or just when first started?? Valve seals tend to be when first started and when using the engine for braking ie. going down a hill in low . Best way to make a marginal engine burn oil is to do a valve job. It will suck the oil past those rings alot faster than it will around the valve stems. Just cause its got good compression doesnt mean it has oil rings that are any good.... And if you had the head REBUILT did'nt they put in new seals and at least check the guides ??

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GARY j

07-29-2003 06:00:35

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Re: Re: Will poor valve seals cause blue smoke? in reply to Klyde, 07-29-2003 04:59:14

Klyde, thanks for the reponse! I had the head rebuilt because it had burnt a valve and it does smoke all the time.

However, when I picked up the head the guy doing the repair showed me some small O rings he said was the seals for this engine. In the past I remember the seals looking more like a bell which slid down the valve stem and over the valve tower on the head. I was wondering if this guy used the wrong type of seal? The guy said he did work the guides etc, but based on the way the head looked when I picked it up I am really wondering if he did a quality job. I didn't kow of this guy but he was recommended.

Thanks agin, Gary

Thanks, Gary

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Mike from Canada

07-29-2003 00:18:29

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Re: Will poor valve seals cause blue smoke? in reply to Gary J, 07-28-2003 15:44:06

yes, and, thats probably true for the diesel engine.

the oil can leak down the valve stem and into the combustion chamber causing the engine to burn oil and indeed smoke.

the o-ring seal helps a little better than the boot style. the boots would probably tend to dry out and crack w/ the intense heat in a diesel engine causing them to leak.

hope this helps!

mike

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Gary J

07-29-2003 06:05:05

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Re: Re: Will poor valve seals cause blue smoke? in reply to Mike from Canada, 07-29-2003 00:18:29

Thanks for the repsonse!! Based on your response and that of Klyde, I feel the valve seals are the correct one for this engine and I may need to rebuild the engine. The rebuilt head didn't look all that great and was questioning the quality of the repiars, but is sounds like looks may not truely count.

Thanks again, Gary

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