Burning Oil and restoring

1971-1989: 280SL, 280SLC, 300SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC, 450SLC 5.0, 500SL, 500SLC, 560SL
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Evaded
Posts: 4
Joined: Sun 11 Dec, 2016 11:49 pm
Model you own: w107

Burning Oil and restoring

Post by Evaded » Mon 12 Dec, 2016 12:13 am

Hi Guys,

New to the forum, I have attempted a search of the forums and I may very well have not been looking for the right thing probably out of ignorance.

I have a 1978 450SLC that is in my opinion very good condition and I am slowly tidying it up attempting to return it for the most part to as original condition as possible.

I am attempting to locate or confirm which was the original head unit as it has a non-operative sony head unit and potentially source a matching head unit from Europe that has been modernised

My other issue is diagnosing the cause of this burning oil, it kind of matches the symptoms of Valve Stem seals however I vaguely recall finding some other cause that roughly matched the symptoms.

It is essentially blowing oil a little bit under load and intermittently when pulling up it will blow some smoke while idling. The smoke is white however has the distinct smell of burning oil and is using a little oil.

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pastelgrey300D
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Re: Burning Oil and restoring

Post by pastelgrey300D » Mon 12 Dec, 2016 12:36 pm

Hi and welcome! Definitely sounds like valve stem seals, if you do a compression test and that comes up good that should confirm if the engine is healthy.

How's your fuel consumption? If injection system is out of adjustment and the engine is running rich that could be exaggerating the problem too.
David
1967 W111 230S - Horizonblau
1965 W110 190c - Mittelrot
1967 W110 200D - Weiss (work in progress)
+ other classics

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Evaded
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Model you own: w107

Re: Burning Oil and restoring

Post by Evaded » Mon 12 Dec, 2016 1:16 pm

Thanks, it tests fine, drives great, I haven't really taken much notice of fuel consumption, it doesn't seem too bad probably around the 18-20ltr per 100km. Seems a little rich but nothing too excessive.

I'm fairly confident it's valve stem seals but figured no harm in getting some further advice on it.

fonzi
Dernburg Wagon
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Joined: Thu 30 May, 2013 1:47 am
Model you own: w107

Re: Burning Oil and restoring

Post by fonzi » Tue 13 Dec, 2016 3:27 am

I've got similar symptoms in my 1973 280se 4.5. My compression seemed to all be 150psi or better with cylinder 8 coming up to only 135 psi before adding a few drops of oil.

Still thinking it is probably valve stem seals, I've started to dig into the d-jet issues more and have found tons of issues.

I get the white smoke on startup too, not just on hard acceleration.

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John Green
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Re: Burning Oil and restoring

Post by John Green » Mon 18 Feb, 2019 3:07 pm

Evaded wrote:
Mon 12 Dec, 2016 12:13 am
Hi Guys,
It is essentially blowing oil a little bit under load and intermittently when pulling up it will blow some smoke while idling. The smoke is white however has the distinct smell of burning oil and is using a little oil.
old post I know, but found this whilst searching for something else. White smoke at idle is generally a perforated transmission vacuum modulator diaphragm. It is sucking the oil up from the transmission.
M.B Spares & Service 14-16 Lyell St, Fyshwick ACT. Ph 02 6239 1099

http://mbspares.com.au - Supporting Australia's Mercedes-Benz Enthusiasts.

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