[W126 Coupe] My 500 SEC smoke when car down a inclined street

[nom]

Hello Dick,
Thank you for your answer.
IF my car have a piston rings problem or a valve problem, it must smoke
every time, no ?
Why it smoke only when front is down and rear up ? It's amazing isn't it ?
It doesn't consume oil or water, nothing. It starts without smoke and turns
very well.
Oil is 15W40 and change every 5000km or 1 year because it doesn't drive a
lot per year. With MErcedes filter only.
When it smokes, the color is light blue, nearly white and it smells burnt
oil. You drive the car 1 or 2 km and it stop to smoke until next downing
road.
I must do the next change of oil and filter, I do it and try to take a
little bottle to do analyse it by a petrol compagny.
REgards
Christophe



-----Message d'origine-----
De : Dick Spellman [mailto:spell.yy at verizon.net]
Envoyé : lundi 8 mai 2006 15:21
À : Mercedes Coupes Mailing Lists; cbcad at free.fr
Objet : Re: [W126 Coupe] My 500 SEC smoke when car down a inclined
street


Christophe Welcome!

If you can, check the compression wet and dry on all 8 cylinders to
confirm what is most likely worn valve seals and/or valve guides.  It
would seem unlikely that the oil rings on the pistons would be the
problem on your engine.  Much more likely that it is the valve
seals/guides.  A less accurate method of assessing what is going on with
the engine would be to answer these few questions.
What grade/viscosity oil are you using?
What is the oil/filter change interval you are using?
What color is the smoke?
Are you consuming oil?
Are you consuming anti-freeze?

Regards,

Dick

cbcad at free.fr wrote:

>Hello to mbcoupe,
>I'm Christophe from France and I own a 1987 500SEC in France. This car runs
>great but since some month when I drive it on a inclined road (when car
goes
>down), some oil is burned in exhaust system and it smokes a lot of at rear
>exhaust pipe ! When you drive it on a horizontal road, all is good. It's
the
>same thing if the car is parked with front down when I start it, it smoke a
lot
>for few minutes.
>All engine runs good but I don't know if oil goes directly to exhaust
manifold,
>or intake manifold and is burned as gas, or maybe a valve problem, or maybe
a
>anti-pollution system fault, etc....
>Someone can help me because I'm very sorry to see my MB coupe like that.
>I hope it's not a big problem, next week I'll change oil and oil filter to
see
>if it change something.
>Please can you advise me.
>Sincerely
>Christophe
>
>PS: How can I join the members's car list ?
>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.
>
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