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

nom cbcad at free.fr
Mon May 8 11:45:42 EDT 2006


Hello Dick,

What is the good compression level should I find ?

I saw a little pipe between left valve cover and cold injector, and interior
of this pipe is plenty of oil. I fellow the pipe after and I see that it
connected to others injectors. My problem couldn't be here ? Is it normal
that this pipe is oily ?
What happen if I deconnect this pipe ? Can I run the engine to test it ? I
joined a picture of this pipe.

Another question, do you know where is located the engine number ?

thank you so much for your help
Regards
Chrsitophe




-----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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