OM 642.930 engine worn out or bad technicians ???

[borisfilipov]

PCV = positive crank case ventilation....

law says an engine can't vent crank cases gases to atmosphere... basically must go back in the engine via the air intake system
a PCV valve helps manage this system...

there is a modified engine breather for your car - that's a part you played with on some of the orange seals to the left of the turbo... its has a mesh oil separator to stop the oil mist going in the intake system. This might be completely blocked and cause part of the issue you have (hence my first post saying to clean it) and not sure how or why - but on this engine it also connects part of the electrical / engine management system - that must do something to manage the flow of crank waste gases.

get this system wrong and it will cause high oil consumption... because there is massive air flow beneath the pistons and nowhere to go so it forces oil up past the piston rings in the wrong direction

each time the top half of the engine takes in 3 litres of air (on each revolution) you displace just as much beneath them... this mixes with the oil thrown around and you have to mange it !!!! pumping losses on a 750cc high revving bike engine (moving air about below the pistons) at 10,000 rpm involves 100bhp just to get to those revs... to get any to do something useful it has to make a lot more on top of that first wasted 100bhp.... piston engines work hard and move shed loads of air

old oil also causes the breather system to struggle (don't know why but they do), if you do an oil change and then test the exhaust gas emissions it goes down... many a car would pass MOT after an oil change, when was a failure before

from the way you wrote your first post I still don't know what your real oil consumption is....

mate thank u very much for paying attention . London - Dunkirk - brussels - frankfurt - vienna - budapest - beograd - sofia - varna ( Bulgaria ) 3.5 Litres . in France i added 1L 5w30 and after 500km i was asked for more . may be it burnt it . and when i got back i changed oils . now i dont have an idea how much because indont srive too much. but for the trip going back 3.5 to 4 littes for 3000km. i have one request for you . my ebglish not so good and i would like to ask u to speak with little less terms and little more understandable . in other words . having in mind what ive done : checked turbo - good , changed 2 orange seals that were broken , changed all oils filters ... what i have left ? i will deff measure compression . what else ? i was looking a video about oil cooler seals change . what else i can do mate ? i will look now the pcv in google . saying one more time , when idle car does not smoke . car gives a little grey to black smoke when revs are like 4000. other situations no smoke . just when kickdown and when idle with gas pedal at 4000.


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[borisfilipov]

and one more thing , when driving on the motorway and when stopping on my rear bunper there were black spots . car is grey . it had black spots in the area of the exhausts .


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[borisfilipov]

and one more thing , if i open the oil cap when engine running , oil is coming out . i mean bubling and if i put a napkin next to it all will be colored black . donno if matters or not .


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[Steve@Avantgarde]

Opening the oil filler cap the camshaft gears are below it so it will throw oil out. Not the best way to check.

Has anyone carried out a cylinder leakage test? Has anyone checked the oil cooler in the V for leaks? That is the most common failure on these, but I am not sure if the OP has reported a leak or not?

 

[turbopete]

That's the same engine as EmilysMum's C3. For all its many faults, oil consumption isn't one of them ...... just about to clock 32000 miles on a 60 plate.

I was more shocked that such a modern, supposedly low emission vehicle was deemed normal to have such high oil consumption. apart from when changing, ive never put any oil in my Mondeo YET

 

[borisfilipov]

compression made with star , no diference between cylinders 113-118 all 6 cylinders .


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[Westheath]

compression made with star , no diference between cylinders 113-118 all 6 cylinders .


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Yea probably best to get an old fashioned test done with an diesel gauge to measure the actual pressure @ 350psi.

Mileage and external conditions pertaining to the results.

Also blow-by measurement and PCV checked.

 

[Botus]

I'd also consider what fuel the last owner was using. If the engine has been run on VEG oil (chip fat) this gums up the piston rings and causes damage long term with the piston unable to transfer enough heat.

It might be adding some posh fuel additives and some special cleaner down the air intake will help remove varnish and other rot meaning the pistons ring have a chance to do something

I'd also check / fit this (if we are on the v6 CDi engine.... its Part number MBA642 010 18 91 ) if you don't have the big red bit its the old one, the other end is the oil separator *its way too small and inadequate for the task. If the pipe or separator are dirty you have no hope.

 

[borisfilipov]

I'd also consider what fuel the last owner was using. If the engine has been run on VEG oil (chip fat) this gums up the piston rings and causes damage long term with the piston unable to transfer enough heat.

It might be adding some posh fuel additives and some special cleaner down the air intake will help remove varnish and other rot meaning the pistons ring have a chance to do something

I'd also check / fit this (if we are on the v6 CDi engine.... its Part number MBA642 010 18 91 ) if you don't have the big red bit its the old one, the other end is the oil separator *its way too small and inadequate for the task. If the pipe or separator are dirty you have no hope.

no veg oil mate . lol . he was doing airport transfers with the s class . u imagine going to pick up custumer and car smells like french fries . hahahah . it was diesel . o have that hose on the photo, u want me to check it ? i looked at it , and there was a little air coming from there .


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[Botus]

no veg oil mate . lol . he was doing airport transfers with the s class . u imagine going to pick up custumer and car smells like french fries . hahahah . it was diesel . o have that hose on the photo, u want me to check it ? i looked at it , and there was a little air coming from there .


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check if its got the big red bit, the original has a small red seal (much smaller) and NO clips to hold the hose on either end, either way clean inside the other end very thoroughly.

the wire mesh in that bit tries to keep engine oil in the engine, whilst letting air past. Its not very good a either task !!!

diesel fuel can have expensive cleaning additives or NOTHING, it was probably run on budget fuel with NO addatives in which case much the same as my post above.... try some decent cleaning additives in both the fuel and via air intake

you may as well take out EGR valve (right of turbo unit) and get that spotless before adding specialised cleaner via air intake system... and NOT with air filters in place !!!!

 

[borisfilipov]

check if its got the big red bit, the original has a small red seal (much smaller) and NO clips to hold the hose on either end, either way clean inside the other end very thoroughly.

the wire mesh is that bit that tries to keep engine oil in the engine whilst letting air past. Its not very good a either task !!!

hold here am going now to make photo but i think there is no red thing there


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[Botus]

sort all the basics.... including all the piece around EGR and additives to un-gum everything...

get it fully warmed up and then drive it very hard, if was driven in traffic, granddad slow it probably is all clogged up and needs some exercise.... if the engine is healthy it will help, if its knackered it will let you know

usual caveats apply

by the way if you want help with your English, French fries are called Chips

 

[borisfilipov]

sort all the basics.... including all the piece around EGR and additives to un-gum everything...

get it fully warmed up and then drive it very hard, if was driven in traffic, granddad slow it probably is all clogged up and needs some exercise.... if the engine is healthy it will help, if its knackered it will let you know

usual caveats apply

by the way if you want help with your English, French fries are called Chips

my firend . what my eye can see is that lef filter box area when sitting face 2 face of car is very oily . right one is clean . attaching photos

first one is left oily , second is the right one


now the thing u asked for

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[borisfilipov]

my firend . what my eye can see is that lef filter box area when sitting face 2 face of car is very oily . right one is clean . attaching photos

first one is left oily , second is the right one


now the thing u asked for

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[Headhurts]

Having read this thread with interest but absolutely no knowledge of what is going on but what is apparent is that the forum has some very knowledgeable and helpful people.

Boris I hope you get this sorted without too much expense and I’m sure you are very appreciative of the help you are receiving.

Robin


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[borisfilipov]

Having read this thread with interest but absolutely no knowledge of what is going on but what is apparent is that the forum has some very knowledgeable and helpful people.

Boris I hope you get this sorted without too much expense and I’m sure you are very appreciative of the help you are receiving.

Robin


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i am
my friend . and do u know why im
here ? because all mechanics here want to take the money but not fix problem . it might be pcv , might be oil cooler , might be a seal , but everybody say open engine piston problem .


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[borisfilipov]

definitely left side is very oilish . other side there is a metal cover that stays grey , in left side its black and very oily everything . any suggestions?


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[Botus]

wouldn't worry about the mildly dirty engine bay at 240k miles that's actually very clean...

I would get the later engine breather part and fit that (pricey £80 but very easy to fit )
I would clean EGR valve (they cost £500 !)
I would (if not done already) fit a new fuel filter
I would used dedicated fuel additive for a few tanks fulls
I would use a cleaning additive via air intake help clean things, - not tried yet, (but its supposed to work) water methanol (50 50 mix) atomise and add after the air filter element to clear out some gunk - with engine running. I'd be careful around the amount and the turbo. I think about 1.5 litre sprayed in over 10 mins helps a lot.

with oil and coolant full - then give it a dam good thrashing and see how u get on....

 

[monkeh]

The engine breather contains a rubber disc, that rips over time. At idle, the disc is held open by a spring. Under vacuum, or when there is throttle demand, the disc seals off the breather from the engine. The only time that disc opens or chuffs open, is when the crank case pressure overcomes the vacuum of the intake. Its a good design, but to use a rubber component in a system that uses oil, is daft.
That would drop oil consumption, Mine dropped dramatically.

The other question, Could your oil cooler seals be faulty? with a blocked drain? That would also cause oil going everywhere.

I have the early design oil breather, but I used jubilee clips to hold my heater hose to the intake.

 

[borisfilipov]

The engine breather contains a rubber disc, that rips over time. At idle, the disc is held open by a spring. Under vacuum, or when there is throttle demand, the disc seals off the breather from the engine. The only time that disc opens or chuffs open, is when the crank case pressure overcomes the vacuum of the intake. Its a good design, but to use a rubber component in a system that uses oil, is daft.
That would drop oil consumption, Mine dropped dramatically.

The other question, Could your oil cooler seals be faulty? with a blocked drain? That would also cause oil going everywhere.

I have the early design oil breather, but I used jubilee clips to hold my heater hose to the intake.

can u show me a photo of what u talk about because im not sure what breather u mean mate ?


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