M104, oil in cooling system strange problem.... - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 11-15-2010, 02:41 PM Thread Starter
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M104, oil in cooling system strange problem....

Hello.

Few weeks ago, i found oil in cooling system. OK. Head Gasket.

I removed head, gave to workshop. They resurfaced it, replaced valve seals and checked valves... Everything was OK.

I bought new head gasket (Elring) and head bolts. I assembled everything (bolts was screw accurately, sequence and torque) , everything was ok, engine run accurately.

I cleaned cooling system, but oil still get through cooling system. Liter per 500 km... I also check Oil cooler in oil filter mount and its ok, no leaks.

Any one have a idea ? Broken head ? There's no leaks to outsite of engine or to cylinders, no liquid coolant on oil, no compression leaks to cooling system.... Only oil on liquid coolant...

(sorry for my bad English...)
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post #2 of 12 (permalink) Old 11-16-2010, 06:41 AM
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Hello,

How well did you flush everything first? I flushed mine for over an hour and the water was clear and still got a little oil residue after I did the head gasket. I siphoned off whatever showed up in the overflow tank a few times and eventually it cleared. I think the oil gets everywhere in the cooling system and it takes a while to get it all out.
You could try doing a detergent type of flush (prestone Super Flush comes to mind) to remove any possible remaining oil residue and then see if you still are getting oil in the coolant. Good Luck.
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post #3 of 12 (permalink) Old 11-16-2010, 07:44 AM
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Get the citric acid flush powder from MB and follow the service directions given here recently (along with the part # of the powder).

Kevin
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post #4 of 12 (permalink) Old 11-16-2010, 08:28 AM
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Oil is best removed with a detergent treatment. Citric acid is chiefly to remove hard deposits and scale. Citric acid also removes oil, but it also needlessly eats away at the base metals during treatment - detergent won't.
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post #5 of 12 (permalink) Old 11-16-2010, 09:25 AM Thread Starter
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I flushed (changed water) system 12 times, at an average 1/week. In last two weeks, i stop flushing and i started to removing oil from overflow tank, using syringe. And from now, i have full, 3 liter bottle with oil removed from system... So i don't thing its a "old oil". Problem must be anywhere else.

Last edited by devcrk; 11-16-2010 at 09:30 AM.
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post #6 of 12 (permalink) Old 11-16-2010, 12:34 PM
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Perhaps you have a failed gasket between the oil filter housing & engine block? I think there is 1 small water passage that goes through the housing gasket. It could have failed internally, in a similar way the head gaskets fail.

Also, did you use factory replacement head bolts??? Aftermarket headbolts might be slightly longer, and in combination with the skimmed head, may not provide sufficient sealing although I suspect that would cause running conditions (white smoke, etc.)

Last edited by sbaert; 11-16-2010 at 12:36 PM.
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post #7 of 12 (permalink) Old 11-16-2010, 01:04 PM Thread Starter
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I checked, new bolts was minimally (maybe 0,5 - 1 mm) short than old bolts - old was minimally strained. But I bought new bolts, because when i screw out, i damaged one bolt and i can't use it again.

I can take photos of old head gasket.




There's two oil "lines" close to water "lines" ? In front of engine, in right site and in rear, in left - very close ? (looking from front of car)

(sorry for bad quality)


And something else, maybe important:
-i didn't overheat engine. Max achieve temperature - 100 C
-50-100 km before i fount oil, i had a ignition coil failure. Engine worked at 6 cylinders, but often misfired. I must drove ~10 km with this problem. Maybe that is reason ?

Last edited by devcrk; 11-16-2010 at 01:42 PM.
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post #8 of 12 (permalink) Old 11-16-2010, 01:21 PM
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#4 piston looks worryingly rusted. It looks like it has been sucking coolant and not fuel for a very long time. Did the coil for #4 piston fail or was it a different one??? These coils are consumables, but failure is usually caused by something else such as the famous biodegradable engine wiring harness.

Why was the whole motor removed to do the headgasket???

Last edited by sbaert; 11-16-2010 at 01:24 PM.
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post #9 of 12 (permalink) Old 11-16-2010, 01:36 PM Thread Starter
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In that photos is my friend's "dead from 10 years" m104. Look for #6 piston

When i replacing head gasket, i made only one photo:


Last edited by devcrk; 11-16-2010 at 01:39 PM.
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post #10 of 12 (permalink) Old 11-16-2010, 01:55 PM
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Still #4 piston looks unusually clean compared to the others. Need more info re. the coil issue. Are you using new coils (All 3) & new coil-2-plug wires w/ Bosch Super plugs???

Are you still running on the original engine wiring? If so, doing the headgasket probably was too much for the harness. A bad harness can shortcircuit the ECU, which is much more expensive than the harness. Don't let it happen.

Last edited by sbaert; 11-16-2010 at 01:58 PM.
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