Piston Ring Compressor, 2 Inch to 5 Inch Diameter, Compress Pistons, Ratcheting Lock, Release Lever, Slide into Cylinder - 648433, Silver

Work great for my 212 rebuild. If you buy it go easy. I cut the heck outta my hand with this thing, it’s sharp.

I bought this for my first time replacing piston rings in a vehicle. The tightening mechanism is stout, and the thumb tab loosens the band with just a push (make sure your hands are around the band when doing this, otherwise the spring tension of the band makes it quickly snap open too loose). At first, I thought the allen wrench supplied to tighten the band could have been a better design, as it makes it too hard to tighten the band after a certain point. After installing my four 3.150" pistons, I realized that this prevented me from making the band TOO tight. As it was, the band was tightened the perfect amount, compressing the rings just enough while still allowing the oiled piston to be easily tapped into the bore. No problems with the band itself being tapped into the bore along with the piston. Judging from the construction quality of this tool, it will last me a lifetime even if I start replacing piston rings on a regular basis (which hopefully, I won't).

It is a little janky but easy to use, and gets the job done.

I have several ring compressor, some quite old but this one worked excellent. Holds the piston firmly and very easy to adjust to get the correct compression and alignment.

Why did you pick this product vs others?: This is absolute junk and because I ordered it ahead of the job I can’t return it. The ratchet worked for two cylinders then stated slipping. I just opened it and it will not stay compressed to fit back in packaging.

Good quality. Works great.

This dinky little thing doesn’t look like it would be too good at it’s job, but surprisingly it worked amazing, very simply, only complaint I have is that when loosening it’s all or nothing and scared the crap outa me the first time I loosened it, but it worked great and that’s all that matters

works as it should