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Home >> Porsche >> 2023 >> Cayenne Base, 4D Utility Coupe >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (13 Engine - Crank Drive, Pistons 4.0L -- 9YA - Cayenne (9YA)) >> WM, 131004 Measuring Pistons (Includes Measuring Cylinder Bore) (V8 Turbo) >> Measuring Pistons

Measuring Pistons

WARNING: This page is about a different variant/trim than selected.
CAUTION: Pointed or sharp objects 
  • Risk of cracks, pricks or cuts 
    • → Wear personal protective gear.
CAUTION: Damage to sensitive engine components! 
    • → Conscientious and precise work
  1. Using a 75-100 mm outside micrometer,  take a measurement approx. 10 mm from the lower edge of the piston, at a 90° angle to the piston pin axis -1-  .
    G15211414Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Measuring pistons

    G15211415Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Piston skirt wear

Piston diameter New in mm Wear limit
Nominal measurement 85.98 Large areas of the stem coating worn and palpable scoring caused by foreign particles

Information 

Nominal measurement without coating (thickness = 0.02 mm). The coating wears off.