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Plastigage is a small plastic string that is used to measure a very tight clearance between two engine half circle metal bearings that enclose a spinning circular crankshaft, camshaft or piston tie rod end.

Plastigage is cut and laid across the width of the contact surface. The two half circle bearings are assembled and tightened to factory specifications, then disassembled to examine the plastigage width.

The width of the compressed plastigage indicates clearance between the parts. The range of Plastigage is determined by its color: green for 0.001-0.003-inch, red for 0.002-0.006, and blue for 0.004-0.009-inch clearances.

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Q: What is a plastigage in mechanics tools?
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