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I am installing new piston rings and had to go with oversize filed down to spec because the standard had gaps too big. The ends of the oversize oil expander seem like they are overlapping when placed in the groove. I know they are supposed to compress like an accordion but that doesn't happen readily, instead, the excess length seems to obstruct slider rings that go under and above it. I had multiple incidents where the sliders didn't sit in right precisely because of that and they would even pop out when I was putting the piston compressor around, which is scary because they could go in the cylinder not lodged properly.

Should I clip the expander just a little (e.g. 1/16" or roughly 1-2 mm), with something like small electrical angle cutters to avoid this overlapping?

amphibient
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1 Answers1

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Oversized rings are only used when boring the cylinders and installing oversized pistons. You cannot expect to use oversized rings on regular sized pistons in regular sized bores. The reason they are overlapping is because they are hugely too big and will not work. You cannot clip the expander ring as it will ruin it. If you look at the ends of the expander, you'll see as the ends meet together, there is a specific shape they form together. If the standard sized rings provided too big of a gap, you need to bore the cylinders.

Pᴀᴜʟsᴛᴇʀ2
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