V70: Engine D4204T5 excessive oil burn

[Sotosound]

Originally Posted by Valdas1988

Cylinders very good condition, the problem was with oil rings. There are very small holes for oil to flow. And my pistons weren't much burned yet, could have been put back old, but I had new ones and replaced...

Many thanks.

Are you saying that the very small holes are new and that these small holes were letting oil through?

[Valdas1988]

That holes stoped flow oil in to pistons. The oil is returned to the engine via the pistons. after the oil has not passed through the pistons rings, it remains in the cylinders and as a result it is burned oil.
piston rings are most often damaged by egr valves because during combustion, everything is returned to the engine via the egr valve and etc..

Originally Posted by Sotosound

Many thanks.

Are you saying that the very small holes are new and that these small holes were letting oil through?

[Valdas1988]

Originally Posted by Dante86

Not yet. Today Volvo diagnosed that there is no significant oil leak in the engine, so I was told this high oil consumption may be connected to a bad Turbo and/or piston rings.

https://static.nhtsa.gov/odi/tsbs/20...46443-9999.pdf

[Sotosound]

Originally Posted by Valdas1988

That holes stoped flow oil in to pistons. The oil is returned to the engine via the pistons. after the oil has not passed through the pistons rings, it remains in the cylinders and as a result it is burned oil.
piston rings are most often damaged by egr valves because during combustion, everything is returned to the engine via the egr valve and etc..

Please excuse my slowness in comprehension as I’m not a mechanic.

If I understand things correctly then the oil control ring is the bottom ring on a piston, and it ensures that the amount of lubricating oil that is allowed to pass by the piston rings is just enough to enable lubrication and no more than this. Is this right?

Are you saying that your oil control rings failed in their job and allowed additional oil to get past the piston rings and into the combustion chambers?

Are you saying that this oil was getting burned during combustion?

Are you saying that some of this burned oil was then passed through the EGR valve and back into the combustion chamber again?

Are you saying that this burned oil then contaminated the combustion chamber and caused damage to the piston rings (and possibly also to the cylinder liners)?

[piotrek]

VEA piston rings:
https://youtu.be/8yJoHgwiwio

General info:
https://youtu.be/Wadmzv1Vs0Q

[Sotosound]

Originally Posted by piotrek

VEA piston rings:
https://youtu.be/8yJoHgwiwio

General info:
https://youtu.be/Wadmzv1Vs0Q

Very informative.

I now understand.

Many thanks.

[Sotosound]

@Dante86 and @Valdas1988

How did your stories end?

@Valdas1988. How is the oil consumption?

@Dante86 Did you keep the car?

[Dante86]

Originally Posted by Sotosound

@Dante86 and @Valdas1988

How did your stories end?

@Valdas1988. How is the oil consumption?

@Dante86 Did you keep the car?

Hi, Yes, I kept the car. The seller undertook the reparation in warranty. A smaller car service (not official Volvo) replaced the Piston rings (the oil rings were visibly clocked). The total repair cost £1000 for the seller (it was very cheap). Since they were disassembling the engine, valve steam seals and crankshaft seal have also been replaced. Now, after 1000 miles it seems the oil burn issue has no longer exist.

[Sotosound]

Originally Posted by Dante86

Hi, Yes, I kept the car. The seller undertook the reparation in warranty. A smaller car service (not official Volvo) replaced the Piston rings (the oil rings were visibly clocked). The total repair cost £1000 for the seller (it was very cheap). Since they were disassembling the engine, valve steam seals and crankshaft seal have also been replaced. Now, after 1000 miles it seems the oil burn issue has no longer exist.

That's great news!

Many thanks for sharing this.

[Chrisv60]

Originally Posted by piotrek

VEA piston rings:
https://youtu.be/8yJoHgwiwio

General info:
https://youtu.be/Wadmzv1Vs0Q

Brilliant, thanks. I had my engine replaced at 4 years old as they said there was something wrong with the piston rings. Volvo paid 90%. I never quite managed to get to the bottom of what the issue was, but now I get it. I've been worrying about it happening again but it looks like the revised rings might have sorted it.