Piston rings

[Dmitry]

Hi! Look at my photos. What can you say about the condition of this piston rings? Earlier I wrote here about oil consumption: http://www.ducatimonsterforum.org/index.php?topic=71329.msg1317536#msg1317536
In the manual is written that piston rings must be 0,020 mm ÷ 0,052 mm (0,055 mm) but the max. allowed wear limit is of 0,10 mm! Why such a spread? Between 0.052 mm (or 0,055 mm) and 0,10 mm huge difference! Or I did not understand something? How to understand the condition of the my piston rings. Later I will look valve guides and valve stem seals but now i want to know conition of my piston rings.
http://ipic.su/img/img7/fs/Snimok.1443281773.jpg
http://ipic.su/img/img7/fs/IMG_3340.1443281257.jpg
http://ipic.su/img/img7/fs/IMG_3341.1443281281.jpg
http://ipic.su/img/img7/fs/IMG_3342.1443281295.jpg
http://ipic.su/img/img7/fs/IMG_3345.1443281311.jpg
http://ipic.su/img/img7/fs/IMG_3347.1443281331.jpg
http://ipic.su/img/img7/fs/IMG_3348.1443281347.jpg

[R1racer]

They look like they have few nicks , deep scratches from here . but what is your ring gap inside the jug ...! That will require removing the rings to measure ..

And honestly if it was my bike and i got that far i will be looking into few thing :

The cylinder Wall

Measure the cylinder wall  with run out gauge

Check your Ring gap inside the wall .. This will answer plenty of your questions


I will also clean the piston surgically clean

New Piston wrest clip .

Check the head , Valve seat while you at it

[R1racer]

Also what is you cylinder wall looks like and what does it measure .


Measurement is the answer to all your concern not how things LOOK

[R1racer]

Make sure to use the piston to drive the rings inside the cylinder to measure the gap this way they go even

[Dmitry]

They look like they have few nicks , deep scratches from here . but what is your ring gap inside the jug ...! That will require removing the rings to measure ..

And honestly if it was my bike and i got that far i will be looking into few thing :

The cylinder Wall

Measure the cylinder wall  with run out gauge

Check your Ring gap inside the wall .. This will answer plenty of your questions


I will also clean the piston surgically clean

New Piston wrest clip .

Check the head , Valve seat while you at it

My ring gap inside the jug = 0,4 mm. What do you think about it?

[Speeddog]

My ring gap inside the jug = 0,4 mm. What do you think about it?

Run it.

Be very careful with the rings when putting the pistons back in the bores.
Especially the oil rings, they're quite fragile.

[Dmitry]

Run it.

Be very careful with the rings when putting the pistons back in the bores.
Especially the oil rings, they're quite fragile.

Thank you for the answer. I decided to change the rings

[Langanobob]

Thank you for the answer. I decided to change the rings

Sorry for being negative but it's not a sure thing that new rings will improve your already good compression and oil consumption.  Chances are the new rings will never seat as good as the old rings and you'll end up with less compression and more oil consumption.

Bob

[Dmitry]

Sorry for being negative but it's not a sure thing that new rings will improve your already good compression and oil consumption.  Chances are the new rings will never seat as good as the old rings and you'll end up with less compression and more oil consumption.

Bob

Thanks for your opinion. I will solve this question with the help of your answers

[ducpainter]

Thanks for your opinion. I will solve this question with the help of your answers

For what it's worth...

Bob is correct unless you take all the right steps to properly prepare the Nikasil to allow the new rings to seat.

[Dmitry]

For what it's worth...

Bob is correct unless you take all the right steps to properly prepare the Nikasil to allow the new rings to seat.

My gaps of oil rings in the cylinders = 1,3 - 1,5 mm. It is so much :(In the manual written that the gap must be 0,3 - 0,6 mm and max. allowed gap for oil rings = 1 mm so put my old oil rings in the cylinders = doesn't make sense.

[ducpainter]

My gaps of oil rings in the cylinders = 1,3 - 1,5 mm. It is so much :(In the manual written that the gap must be 0,3 - 0,6 mm and max. allowed gap for oil rings = 1 mm so put my old oil rings in the cylinders = doesn't make sense.

End gap doesn't contribute as much to oil consumption and compression leakage as poor seating, and you haven't convinced us you actually have a problem with consumption, compression, or performance.

While that oil ring might be out of spec wrt end gap you're setting yourself up for more issues. Have you determined what kind of piston clearance you have, or the diameter of the bore? Just deciding to replace rings because the end gap is out of spec is no insurance you will solve what everyone here considers a non problem.

[Dmitry]

End gap doesn't contribute as much to oil consumption and compression leakage as poor seating, and you haven't convinced us you actually have a problem with consumption, compression, or performance.

While that oil ring might be out of spec wrt end gap you're setting yourself up for more issues. Have you determined what kind of piston clearance you have, or the diameter of the bore? Just deciding to replace rings because the end gap is out of spec is no insurance you will solve what everyone here considers a non problem.

I determined piston clearance and diameter of the bore. They are in the normal range. So I think that end gap of oil rings influence on oil consumption. My oil consumption before repairing was equal to 300 mm on 1000 miles. Also I watched valve guides and stem seals. Stem seals I already bought. Valve guides have very very small gaps so I think that new stem seals will not allow to flow the oil in the engine. I can record all this operations with gaps on the camera if someone it can help me to solve my question.

[ducpainter]

300 ml/ 1000 miles is not enough consumption to warrant a rebuild, or even investigation IMO.

You obviously feel differently, so go right ahead and do what you want. It's clear we're not going to dissuade you.

[Dmitry]

300 ml/ 1000 miles is not enough consumption to warrant a rebuild, or even investigation IMO.

You obviously feel differently, so go right ahead and do what you want. It's clear we're not going to dissuade you.

I got confused I want to do that my engine feel itself better and assemble the engine with old parts (piston rings and others) I both do not want but your opinion force me to think about all of this situation So for a start I want to search rings at an affordable price if it possible. Then decide what I must to do. Because to buy EXPENSIVE new rings and (thinking about your opinions) make worse it is very COOL
Thank you for answers!