Cloud of smoke after sudden stop in 1986 560SEC - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 10-15-2017, 12:41 PM Thread Starter
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Date registered: Oct 2017
Vehicle: 1986 560SEC Past Cars (all from the 80's) 5 cyl 300D, 6 cyl 300SE, 8 cyl 560SEL
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Cloud of smoke after sudden stop in 1986 560SEC

Hi everyone,

Just joined after reading this forum for the past few weeks.

Have a 1986 560SEC that I am not currently using because of this problem. First noticed problem after going down a steep hill. Now happens after stopping as well. It seems like oil is being forced into the cylinders and then burning. Thought it might be the rings?

Any ideas? Fixes? Estimates?

Kayak9
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post #2 of 13 (permalink) Old 10-15-2017, 04:06 PM
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Had an m110 that I could "James bond"'someone at will. Hard deceleration oil would slip past valve guides and burn. Came in handy when some tool in a 3 series convertible flew up my ass when I was doing 75, and flashed his lights at me. I accelerated up to 90, then let off the gas hard. Dusted him and the blonde with him with a huge blue smoke cloud. He gave me.room after that.

Might just be valve seals, does it normally use oil?
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post #3 of 13 (permalink) Old 10-15-2017, 04:22 PM
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In addition to above suggestions, have you noticed then brake fluid reservoir level dropping?

Just a thought, perhaps out of a box or two, but a bad master cylinder will puke fluid into the booster vacuum... HUUUUGE smoke on braking can ensue.....

Good Luck man,

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post #4 of 13 (permalink) Old 10-15-2017, 06:27 PM Thread Starter
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Date registered: Oct 2017
Vehicle: 1986 560SEC Past Cars (all from the 80's) 5 cyl 300D, 6 cyl 300SE, 8 cyl 560SEL
Location: The cold part of Canada
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Yes it had started to consume oil. Was running heavier oil to cut down on smoking. Also had used an additive for older engines.

It is such a fine looking car it is a shame for it to sit. Thinking about reviving her. Not very mechanical but have lots of time on my hands so researching what it could be. Trying to befriend a mechanic here so it doesn't cost me a fortune. Willing to try and get my hands dirty and undertake a project and do it myself but feel this will be way beyond my ability.

As my old mechanic would say "I'm sure it's nothing a wallet can't fix".

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post #5 of 13 (permalink) Old 10-16-2017, 01:53 AM
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Quote:
Originally Posted by Kayak9 View Post
As my old mechanic would say "I'm sure it's nothing a wallet can't fix".
This is one of the best "golden thoughts" I've ever heard.

Mine '88 560 SEL also has the oil smoking problem, after the engine gets it operating temperature when you floor it the car leaves behind a fume of blueish smoke. Almost every car mechanic I asked about this problem said - check the valve seals, their're probably gone after 29 yrs and 360 kkm. I don't have to say that it consumes oil - consumption increases with higher revs so that's probably it.

I'm waiting for a good opportunity to change the seals, you can do that without removing the camshafts so it shouldn't be a high risk job, although it requires some mechanical skills.
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post #6 of 13 (permalink) Old 10-16-2017, 05:47 AM
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Quote:
Location: The cold part of Canada
If you could pinpoint exactly what cold part you're in I might be able to help.


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post #7 of 13 (permalink) Old 10-16-2017, 09:36 AM
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Smoking under heavy acceleration is usually piston rings. Smoking under heavy engine braking is usually valve guides.

How much oil does it use between oil changes?

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post #8 of 13 (permalink) Old 10-16-2017, 11:38 AM Thread Starter
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Date registered: Oct 2017
Vehicle: 1986 560SEC Past Cars (all from the 80's) 5 cyl 300D, 6 cyl 300SE, 8 cyl 560SEL
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Smoking Q/A

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Originally Posted by John350 View Post
Smoking under heavy acceleration is usually piston rings. Smoking under heavy engine braking is usually valve guides.

How much oil does it use between oil changes?
Smoking was after stopping only. When idling wasn't smoking or on acceleration as I recall. Car has been sitting unused. Wasn't using a lot of oil. Started problem while on vacation after going down steep hill and hasn't been used much since. I haven't checked the brake fluid yet as another user suggested. It was a lot of smoke and didn't want to be driving the car not knowing what was wrong in the engine.

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post #9 of 13 (permalink) Old 10-16-2017, 11:42 AM Thread Starter
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Date registered: Oct 2017
Vehicle: 1986 560SEC Past Cars (all from the 80's) 5 cyl 300D, 6 cyl 300SE, 8 cyl 560SEL
Location: The cold part of Canada
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What isn't the cold part of Canada

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Originally Posted by xlimodriver View Post
If you could pinpoint exactly what cold part you're in I might be able to help.
I am in Manitoba in the interlake region. Watched a video an changing the valve seals. Don't think I would attempt that.

Here is another important question. I think the car might have its original timing chain still (192k). Was unable to determine if previous owner had replaced it. Is this something that should be getting changed as well if the engine is coming apart?

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post #10 of 13 (permalink) Old 10-16-2017, 04:08 PM
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Quote:
Originally Posted by Kayak9 View Post
I am in Manitoba in the interlake region. Watched a video an changing the valve seals. Don't think I would attempt that.

Here is another important question. I think the car might have its original timing chain still (192k). Was unable to determine if previous owner had replaced it. Is this something that should be getting changed as well if the engine is coming apart?

Kayak9
Absolutely, no questions asked, change that stuff

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