Customer Reviews

Powerbuilt 648433 Piston Ring Compressor

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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).