dose anyone know if the engine oil cooler on a ml 270 cdi is water cooled iv got oil in my water head is not gone got black oil in header tank
To answer your question, corrosion within this transfer unit could cause engine oil and coolant to mix.
Oh Great!!
So not only the VALEO Rad issue but Alloy rot as well to worry about..
I agree..Some aspects of the engine are too complicated.
P.S Glad to see you sorted your internet connection with the forum Ian..
Oh Great!!
So not only the VALEO Rad issue but Alloy rot as well to worry about..
I agree..Some aspects of the engine are too complicated.
P.S Glad to see you sorted your internet connection with the forum Ian..
Keep the coolant protection up to strength and there would be no corrosion?
Life really is too short to worry about ifs and maybes
That is the point - there are many who don't keep the coolant % where it ought to be and think the stuff lasts forever. I change mine every 2 years whether it needs it or not. I've seen too much damage to heads and other alloy parts over the years from lack of maintenance on this issue. Cheap insurance.
.. - there are many who don't keep the coolant % where it ought to be and think the stuff lasts forever. ....
No idea about your side of the world, but over here in Blighty, there's still the perception that the coolant just needs 'antifreeze' & if it isn't cold enough to freeze, then what's in the coolant system will be good enough. The anti-corrosion bit completely escapes them
So any idea what I need to change ?
Generally speaking, we don't worry about the antifreeze properties too much for obvious reasons. ....
Haven't been on here for a while but if you haven't sorted this yet. Yes the oil cooler is definately water cooled. it is mounted on the rear side of the timing case on the passenger side. You can just see it under the manifold.
The passages are quite small and fine so not sure if it corrodes easier but my Jeep (same engine) has had 3 of them stuff up (1 in my ownership) and as far as I can tell from service records and records from previous owner the coolant was changed as required. The other possible issue could be stray current and maybe it affects the cooler first being so fine. I don't really know except that I was not prepared to go through it again so I have put a bypass plagte in place with a traditional air cooled cooler out the front.
The last one put in mine didn't even last 12 months yet it is still on original radiator whihc is not showing any signs of issue.
On the Jeep at least it is hard to get to but with a bit of contortioning can be removed without removing the manifold but we have a different manifold.
To be honest its more likely to be an oil" heat exchanger " rather than a "cooler "---possibly to get the engine oil up to a stable operating temperature faster in cold conditions rather than cool it down.
Fester - thanks for that great breakdown. I always thought that my auto oil went through the heat exchanger - pipes go up into that area but very hard to see just where they go. If the auto oil doesn't go through there, where on your Jeep is the auto oil cooled? Is there a bottom tank in your radiator? Could easily be different on the MB in that area. I have no other cooler other than the "low temp radiator" which carries coolant - not oil. I assumed it was for the auto oil and possibly also the engine oil. Seems I need to do some more research or have some kind indie tell me how it works. I have not heard of any 270 motor in a Benz that has had your problem.
I have always bought the special synthetic oil from MB. Exxy but cheaper than trannys. Can't drain my torque converter so can only change 4.5 litres at one go. I did it at 60K and again at 130K. Was blacker than I liked the 2nd time. Bit more km's and some original oil still in there. Intend to do it every 50K from now on. A good cooler setup would help prolong the oil life for sure. It is on the list. I think it is only because I do a lot of towing that it is an issue. Only tow 1600KG so wonder how MB claim it can tow up to 3500KG. That would kill it for sure.