I have diamond pistons for my 408(4" stroke x 4.030" bore) using total seal gapless rings. I can't seam to get my oil rings the go properly into the ring land, they fit in the cylinder though. I have already installed the oil ring support, do I have to put that in last? I am not sure if you put the rails in with the oil ring or put the ring in then try getting the rails in?
Thanks Brandon

 

Put the expander on first, then one oil ring at a time. Making sure after each ring that the expander is still "butted" together correctly. That is why the ends are normally colored for easier verification.

 

I will give that a shot tonight, thought I tried it already but maybe I didn't.

 

And be sure to offset all three ring end gaps. As was already posted, put the large expander on first, followed by the bottom support rail, then the top support rail.

There are diagrams you can find if you need guidance on end gap offsets. Even "gapless" rings have a split and you don't want them in line w/ each other.

 

I got one oil ring on, I did the expander then the lower rail and upper rail just like you said. The biggest issue I was having is trying to fit them in with the support that is there because the ringland falls below the wrist pin not sure the technical name for it.

 

It's called a support rail, and it shouldn't interfere with the ring install.

 

Do You have a ring expander ,,,,,,,it could help ,,,,,,like 5 bucks

 

I don't have a ring expander, maybe ill go pick one up if they are really that cheap.

 

Ring expander will not help with the oil ring, works great on second and top.
One thing that is common is burrs in the oil ring groove caused from boring the pin hole. Make sure the ring groove is flat where the pin goes by. Small burrs can hold the ring rail support up, causing the oil ring to give you trouble. Also make sure the dimple in the rail is in the pin opening.

Kurt