(three-piece oil ring)
Fitting piston rings
May 02, 2005
25 Replies
It's not really necessary to stagger the end gaps. They are going to move anyways. It's not a bad idea to have them unaligned, but dont' do it in the misbelief that they will stay that way. Unless you have pinned rings, but that is typical only on 2-stroke engines to keep the end of the ring from snagging in the ports.
You need to rent a ridge reamer to get rid of the ridge. A hone wont do it. At this point you would probly be better off getting the block machined. A ridge that you can catch a finger nail is likely ~5thou so both sides gives you a 10thou over size. That is just fro the ridge, you might have an out of round cylinder ( the pistons pushes down and to the side on the power stroke) Pat
I'm not sure about that. I tore down a Saab engine recently with
250,000 miles on it (bulletproof inline-4 2 liter engine), and all four pistons showed the gaps in the piston rings where the manual specified to put them. not sure why/how, but they were. I don't know the history of the engine, but it wasn't recently rebuilt unless they left the sludge inside when they did it...plenty of carbon and so on.Nope, these aren't the pinned 2-stroke Saab pistons, this was for a
4-cyl.
compressing
this???
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