William Ortel Porsche Repair

Checking Pistons And Cylinders

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Cylinder

D1 Measuring point for wear and ovality 30 mm below top edge of cylinder

The cylinder is worn if this measurement is 0.08 mm more than the new size specifications. Ovality is checked by measuring in directions a and b. The difference between a and b may not be more than 0.04 mm.

D2 = Measuring point for piston ring end gap clearance

Rings slid in to height of cylinder base gasket.

Piston

D = Measuring point for wear At height of lower edge of piston pin bore.

Caution

Replace pistons and cylinders if clearance exceeds 0.15 mm.