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Use this plate and a depth gauge to measure the Top Dead Center Clearance of the piston/cylinder/head assembly. Shims that come with the piston cylinders are stacked to create an area of displacement between the top of the cylinder and the compressor head.
BVV's Recommended depth is 0.012" for the BVV 4 & 2 Cylinder Butane Recovery pumps. This gap is recommended for optimum recovery performance.
Top Dead Center Clearance Instructions
*Depth Gauge Not included, Any simple depth gauge will work, and you will also need the shims that come in the BVV-6 kit.