850 T-5 coolant boiling???

[Hellas850 T-5]

Hello guys,it’s been a long time....I hope everyone is fine here.

I noticed after my last engine rebuild that the coolant is probably boiling,I changed the engine block because mine was destroyed,this was the main part that was replaced.after the first symptoms I thought compression was in the coolant but no coolant missing,no overheating,no coolant in the oil.but the block was checked from me and from the machine shop,the machine shop installed firerings around the cylinders and he closed the gaps at the top of the cylinders where is a weak point of these blocks.any thoughts?I know that I miss something and can’t find the problem.or could it be from the block something?

thanks in advance.

[TryingBe]

I read it three times and I still have on idea what you're trying to say.

[Hellas850 T-5]

11 hours ago, TryingBe said:

I read it three times and I still have on idea what you're trying to say.

why is that?it is on the topic title,I've searched a lot things on the car already,my last hope before opening the engine again is here,if someone has any idea.

without opening the expansion tank cap,and from inside the car,with switched off engine I can hear noise like air in the system.if I open the cap for at least one minute air bubbles coming out like hell.

 

thanks Kimonas.

I will try to upload a link,there is a video.

[TryingBe]

On 9/19/2018 at 12:50 AM, Hellas850 T-5 said:

why is that?it is on the topic title,I've searched a lot things on the car already,my last hope before opening the engine again is here,if someone has any idea.

without opening the expansion tank cap,and from inside the car,with switched off engine I can hear noise like air in the system.if I open the cap for at least one minute air bubbles coming out like hell.

Because you said, " I thought compression was in the coolant but no coolant missing,no overheating,no coolant in the oil."  That indicated everything is working fine.

The coolant system works under pressure, by opening the cap while engine is HOT , you release that pressure and coolant/water comes out immediately. When you put water back in and close the cap, there is air in the system which will self bleed if you don't constantly opening a hot coolant system.

Did you use 50% coolant/50% water? Sounds there is nothing to be concern.

[Hellas850 T-5]

Update of the situation,

I found the problem,finally it was from the turbocharger something,I didn't search it further,it was my last chance before getting in trouble with the engine.I just removed the coolant pipes from the turbo tapped them at the engine side and the symptons mentioned above were disappeared,I have driven around 800-1000 km without problem.

It is pretty strange and impossible but this was.in the future maybe I will make a detailed check on the turbo if it will be out of the car.

the turbo that I have on is GT3071R.

 

[Boxman]

You removed the water cooling from a GT3071R?

[hotpantslovebug]

I think i know what you are trying to say. After your rebuild you noticed coolant boiling. I.e you hear coolant bubbling when the car is shut down? you then removed the coolant lines to the turbo and the issue went away? how did you route your coolant lines to the turbo? If you route the inlet and outlet wrong you will hear gurgling upon shutdown. The correct way ensures coolant is automatically circulated via convection when the engine is stopped. 

Edited August 23, 2019 by hotpantslovebug

[apeacock]

Fill from the bottom drain from the top! 

[Hellas850 T-5]

On 8/22/2019 at 6:16 PM, Boxman said:

You removed the water cooling from a GT3071R?

Yeap and the problem disappeared 

On 8/23/2019 at 4:51 AM, hotpantslovebug said:

I think i know what you are trying to say. After your rebuild you noticed coolant boiling. I.e you hear coolant bubbling when the car is shut down? you then removed the coolant lines to the turbo and the issue went away? how did you route your coolant lines to the turbo? If you route the inlet and outlet wrong you will hear gurgling upon shutdown. The correct way ensures coolant is automatically circulated via convection when the engine is stopped. 

I had the cooling pipes with the same routing for years now,never had an issue before.this problem appeared after my last rebuild.So it confused me.you can't imagine how bad was,at idiling after returning back home from work if I would open the expansion tank cap for at least 3 minutes the coolant was boiling.