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Fitting Pistons Audi 90 B4

Mechanical
  1. Measure cylinder bore diameter in 3 places: At Center Of Bore .39" (10 Mm) From Top Of Bore .39" (10 Mm) From Bottom Of Bore If cylinder bore diameter is not within specification, hone cylinder bore until diameter meets first or second oversize specification. See «CYLINDER BLOCK SPECIFICATIONS»(ref-122049-S04718149122001091300000) table under ENGINE SPECIFICATIONS.
  2. Measure piston diameter at 90 degree angle to piston pin, about .39" (10 mm) from bottom of piston skirt. If piston diameter is not within specification, replace piston. See «PISTONS, PINS & RINGS SPECIFICATIONS»(ref-122049-S17560591212001091300000) table under ENGINE SPECIFICATIONS.

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