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What is Piston Oil Ring Clearance

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When installing oil control ring's solid top and bottom spacer rings over and under the expander ring, what clearance should be measured between spacers and groove walls? TIA.

Reference time 10:50 where the instructor mentions this.

Also are LUJ wrist pins press fit into the connection rods or are they free floating? If one installs new pistons do they have to heat up the connection rod end to get the wrist pin to fit?
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