If for some reason you disassembled a Toyota engine just to put it back and hope it will still work, here’s a short tutorial on how to check the piston rings gap tolerance, which will tell you if the rings can still be used or not.
The piston rings have three major roles - to seal the combustion chamber, clean the cylinder wall and create a very thin layer of oil on it in order to minimize friction.
Each ring has gap, which serves two purposes - it enables you to take them out or put them back in their niches on the piston, as well as allowing you to measure how much worn they are.
In order to measure the gap, you need to place the piston ring inside the cylinder, at around two centimeters deep. Use a ruler to place it evenly. Next take some blade gauges and stick them in the small gap to see how wide it is. As, you will imagine, the wider the gap - the bigger the wear.
This is a DIY guide and, as such, you must be aware the procedures described here involve some risks. autoevolution cannot be held responsible for any possible damage that might result while following this guide.
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