Oil in Coolant Expansion Tank: Reno Clio 1.5 dci Grand Tour 2012 - Head Replacement & Thermostat

Hello!
I have a problem with the oil in the coolant, the head has been replaced, the problem persists, I heard that after replacing the thermostat, the problem disappears, but I would like to know what the engine oil thermostat has? It's about the Reno Clio 1.5 dci Grand Tour 2012.

Hello,
And the new gasket?

xjanuszx123 wrote:

I heard that after replacing the thermostat, the problem disappears

Somehow I don't see a connection either. On the other hand, usually the oil in the coolant is the result of a damaged or improperly installed head gasket.

The thermostat has nothing to do with the oil. Certainly, a lot of oil remained in the cooling system after the previous failure, e.g. in the radiator, side and expansion tank.

There is one more issue:
How professionally was the engine cooling system rinsed out of the engine oil in it?

władziowek wrote:

Hello,
And the new gasket?

Yes, new

It is hard to wash out the oil. In fact, there is no method that will remove it completely from the cooling system. Well, maybe except the sodium hydroxide solution. Unfortunately, half the engine would have eaten with the cooler to start with. You can also buy Merida Fatex liquid in the form of a condensate and pour the diluted solution with ordinary water and drive, pour it again and drive the same way, drain it, etc. For now, go ahead and watch if the oil arrives in the cooling system. Obviously, collect this decayed oil from the cork and the surface of the coolant in the expansion tank. It should be getting smaller.

water pressure and overflow rinse the system for a longer time

Yes, however, each engine has a small and large circuit closed with a thermostat, so how does a colleague want to rinse it all? You would have to disassemble and rinse in turn, but water alone will not wash out the oil from the porous walls inside the water channels. A crude oil utilization and decomposition agent for leakage in unloading ports would be better. Hardly available in detail. Or a strong degreaser for petroleum products such as Citra Clena Degreaser.

A friend of mine used dishwasher tablets to flush the cooling system after an UPG breakdown and says it helped. Also after replacing the gasket, he had a problem with oil residues in the coolant.

He dissolved tablets in hot water and flooded the system through a funnel with a fine sieve, heated the engine, drained the water and rinsed the system.

I would not risk using dishwashing liquid because it foams - and there may be a problem with quickly removing heat from the engine walls - and dishwasher chemicals do not.

And who writes about dishwashing liquid? By the way, I don't know how dishwasher chemicals will affect the aluminum in the radiator or the thermostat gasket. I wouldn't risk it.

There is such a fluid available on the intercars network. Unfortunately, I do not remember the name, but in a very oily system, the procedure was repeated twice and it became clean as before the failure. Something from liqui Molly

cooltygrysek wrote:

It is hard to wash out the oil. In fact, there is no method that will remove it completely from the cooling system. Well, except maybe sodium hydroxide solution. Unfortunately, half the engine would have eaten with the cooler to start with. You can use dishwashing liquid for rinsing, but it doesn't really do much. You can also buy Merida Fatex liquid in the form of a condensate and pour the diluted solution with ordinary water and drive, pour it again and drive the same way, drain it, etc. For now, go ahead and watch if the oil arrives in the cooling system. Obviously, collect this decayed oil from the cork and the surface of the coolant in the expansion tank. It should be getting smaller.

cooltygrysek wrote:

And who writes about dishwashing liquid? By the way, I don't know how dishwasher chemicals will affect the aluminum in the radiator or the thermostat gasket. I wouldn't risk it.

I don't know who writes about dishwashing liquid, but certainly not me ...
There is no need to worry about aluminum, it will not burn through it.

I strongly advise against dishwasher chemicals. They're churning out aluminum at an alarming rate. It will destroy everything that is aluminum.

What about the oil cooler?

In fact, I wrote about the dishwashing liquid admitting my mistake. Thanks we will improve. What about the oil cooler? does a friend have one? Maybe there's a leak in the oil cooler.

I pour water with the addition of engine cleaner there, I use Tenzi Truck. I will drive 10 kilometers, wait until it cools down a bit, let it go, wait until it is almost cold and rinse the hose several times. I pour clean water, I will drive again ... Three times and it's ok. Someone wrote about the oil cooler above and this is a good clue. A damaged cooler is relatively common.

The engine cleaner contains sodium hydroxide, NaOH. Highly corrosive aluminum, especially coolers, congratulates your creativity. Tenzi Truck, on the other hand, is cash.

Most of the time I have regular customers, new ones tend to keep coming back too, so I would know if something was wrong with their coolers after this operation. I am aware of how this product works, but I do not know a better way to clean the cooling system. When washing the engine, it is also impossible to avoid getting the radiator wet from the outside. Note that about a year after purchasing the car, the radiator often needs to be replaced. I think it's the work of the traders washing the engines and rinsing them with caustics. So if you don't try hard, the outside can create a hole from the inside.

I do not want to create a new topic, so here I am asking the question "how to EFFECTIVELY clean the cooling system after replacing the head gasket if oil got into the cooling system before?". I would like to add that ideas with a dishwasher tablet, or multiple rinses with water, or ready-made measures, which someone advised against on this forum, do not convince me.
I wonder if an ordinary universal solvent from the supermarket would do the trick. The solvent is bound to react with the oil, which spreads with it and can lead it out of the system. But the question is, can such a solvent cause any damage to the engine ??? I add that so far I have used a solvent to clean the expansion tank and it did a great job, i.e. the tank is almost clean from the inside, and there is certainly no oil residues in it - at least until the next engine start . I hope that someone wise and experienced will comment on this issue and advise me something ... or maybe washer fluid ... ???

The solvent and oil will destroy the rubber parts of the cooling system. Take a large construction bucket, pour water with a lot of Ludwik or some other dishwashing liquid. Remove the thermostat, disconnect the circuit. Submersible pump and driving. Large circulation, then small. Several water changes. A day of work, but the layout is as clean as a baby's pup.

Take into account that some of what you pour in will not be drained, in some cars it is even up to 2l, which cannot be removed without disassembling the engine.

With this Ludwik it's a very good idea in my opinion, but he can just pour Ludwik or Fairy or something similar to the cooling system, warm up the engine and wait to see what happens. It will probably foam .
Note "ociz" is very expensive, so I think you should use agents that do not harm the engine and engine accessories ....
How about vinegar, I don't know if it dissolves the oil, but I have encountered videos promoting it as a descaler for engine heaters. Can vinegar dissolve oil too ???

The vinegar is used to descale the block, pipes and coolers, and is unlikely to dissolve the oil. I would use Merida Fatex M242 for rinsing. It foams less and dissolves oils and greases better. It is tolerated by fabrics, rubbers, plastics, metals, etc., completely safe and recommendable. On the other hand, with the use of vinegar, I would refrain from it because we do not know how much boiler scale there may be, and it can cause a lot of work or a serious fault, including a broken block, because it can clog the water channels.

And not simply a dynx?

And I would do nothing but drive, and from time to time wipe the cork from the 'butter' that settles on it, after a few days, it will be calm.

władziowek wrote:

And not simply a dynx?

Alcohol will damage hoses and rubber seals.

Take advice from colleague Teva. Oil cooler faults in these cars are a common ailment. In this engine, symptoms of this type should begin with checking the oil cooler for leaks.