Piston ring replaced

[aziz]

Hi my expedtion 2019 3.5l 160k
White smoke when i start the engine 3 second and gone ..
2 turbo changed last October
From 15/11/2025 until today the replaced piston rings with head gasket and 2 piston
I received the car today
Update i test the car there is still smoke not visible too much but i can see .. im tired
So im asking is it normal to smoke every time i start the engine even after i turn it off and on again ??

 

[5280tunage]

not sure if that's 160K km or mi (guessing km) or around 100K mi, i'd say probably not normal. However, if coolant/water and/or oil were making it past the rings and burning on the way out, there could still be a lot of material in there. I highly doubt the cleaned everything well enough, so it could just be residual burning off. give it a couple weeks.

if it's 160K mi, i'd bet there is more stuff wearing out and letting stuff pass through.

how's it driving? watch your coolant levels closely.

 

[duneslider]

I'm no engine mechanic but I have never heard of anyone just replacing the rings and problems being solved. If the engine is so bad the rings are bad, I would think you need more than just new rings. As cheap kids we would try to re-ring our dirt bikes to get a little more life out of them, still not sure how much life we really got out them doing that but we could get the rings and gaskets cheap and we would do it to get us through the summer.

 

[Dice Roll]

What does your paperwork say was replaced with the ring job? Smoke at startup tells me valve guides are worn. This seems pretty strange as most rings for decades are causing little wear. That really a full tear down to install, if no other work was done I’d be wondering if it they actually did it. Checking the heads would be routine for such work. They have to come off anyway.

Was it burning oil before the work?

Any residual oil in engine should’ve burned off the first few minutes it was restarted after the work.

Off top of my head I’d also be thinking PCV system somehow sending a bunch of oil into intake. The new turbos should be sealing well. It’s just something wasn’t touched that would be still allowing oil into chamber after new rings.

 

[GaryH]

Valve seals?