Head gasket or not ???? - Page 3 - Mercedes-Benz Forum
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post #21 of 29 (permalink) Old 05-16-2018, 11:07 AM
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UPDATE

I bypassed the oil cooler, flushed the cooling system and drove for like a 1000 kilometers. Unfortunately the oil returned to the coolant reservoir so it's definitely the head gasket. I took the car to a trusty Mercedes mechanic and he removed the head, and we can tell that the head gasket has never been replaced before.
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post #22 of 29 (permalink) Old 05-16-2018, 11:11 AM Thread Starter
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UPDATE



I bypassed the oil cooler, flushed the cooling system and drove for like a 1000 kilometers. Unfortunately the oil returned to the coolant reservoir so it's definitely the head gasket. I took the car to a trusty Mercedes mechanic and he removed the head, and we can tell that the head gasket has never been replaced before.


The head looks good though I hope itís just this no further issues.


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post #23 of 29 (permalink) Old 05-16-2018, 11:22 AM
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The head looks good though I hope it’s just this no further issues.


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I was a little surprised of how clean the engine looks even after doing nearly 200k kilometers (125000 miles). The pistons have just a small amount of carbon deposits and the valves looks clean too. I guess it has to do with how clean the petrol is in Germany and Denmark, since these are the 2 countries where the car has spent its life.

Let's hope that the head checks out to be fine when the machine shop is done with pressure testing and resurfacing. To bad we have to wait until the end of this month because they are closed for a holiday, and my mechanic would not deal with other shops because he only trust these guys.
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1992 Mercedes-Benz W140 300SEL 285XXX Km.(SOLD)
1996 Mercedes-Benz W140 S320L 192XXX Km.
1995 Mercedes-Benz W140 S500 110XXX Km.


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post #24 of 29 (permalink) Old 05-16-2018, 11:27 AM Thread Starter
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I was a little surprised of how clean the engine looks even after doing nearly 200k kilometers (125000 miles). The pistons have just a small amount of carbon deposits and the valves looks clean too. I guess it has to do with how clean the petrol is in Germany and Denmark, since these are the 2 countries where the car has spent its life.

Let's hope that the head checks out to be fine when the machine shop is done with pressure testing and resurfacing. To bad we have to wait until the end of this month because they are closed for a holiday, and my mechanic would not deal with other shops because he only trust these guys.


Great to hear that, looking forward to see the engine running ok with no milkshake.


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post #25 of 29 (permalink) Old 05-16-2018, 07:54 PM
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post #26 of 29 (permalink) Old 05-16-2018, 11:46 PM
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The engine will look clean because the coolant was cleaning it. That's the only good thing that happens when you have a bad head gasket.
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post #27 of 29 (permalink) Old 05-17-2018, 09:00 AM
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@MAVA

Thank you for the links. I don't believe it's that hard to replace the head gasket on the M104. Infact, I was going to do it by myself, but I live in an apartment, so I would have to do it on the street, and my neighbors are already fed up with me and my brother working on our cars in the parking lot . Besides, I might need some tools that I can't have access to since I would be working on the street, like an air compressor etc.

@illstplaya

That's true, but my car was not smoking so there is no coolant in the combustion chamber, nor in oil. The car was driving fine with no problems whatsoever (no coolant loss, misfires or overheating). I even discovered it by coincidence when I was checking the oil and coolant level as I always do every 2-3 weeks.
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1995 Mercedes-Benz W140 S500 110XXX Km.


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post #28 of 29 (permalink) Old 05-17-2018, 04:04 PM
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It is my understanding that the head of an M104 should not be resurfaced. if overheated head likely needs to be replaced. If not just new head gasket should fix it up. That is what a senior MB tech told me many years ago.

Seth
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post #29 of 29 (permalink) Old 07-02-2018, 06:45 PM
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Update:

I got the car a while back and it has been driving fine with no more mixing. The mechanic did clean the cooling system, but there are still some traces of oil. I will be removing the radiator and the coolant reservoir to give them a thorough cleaning. Will probably change the hoses too. But before I do all of this I want to flush the system, and upon some search, I found out that using some engine degreaser with the coolant would dissolve all of the oil emulsion, but I don't want to risk damaging the new head gasket, cylinder head, water pump and radiator etc. Anybody knows if this would be harsh on engine and cooling system?

Using washing detergent is out of the question because I already tried it before the head gasket replacement and my water pump started leaking after a while, and the radiator started leaking too, but those where original 20 year old parts that probably needed to be changed, but who knows if the detergent had anything to do with it or not..

1992 Mercedes-Benz W140 300SEL 285XXX Km.(SOLD)
1996 Mercedes-Benz W140 S320L 192XXX Km.
1995 Mercedes-Benz W140 S500 110XXX Km.


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