Measuring Piston Protrusion

STANDARD PROCEDURE - MEASURING PISTON PROTRUSION
After replacing the pistons/connecting rods or machining the engine block contact surface, it is then necessary to measure the piston protrusion.
Measure protrusion between piston crown and cylinder head contact surface without the head gasket installed. The measurement must be carried out in the direction of the piston pin in order to eliminate piston rock.





1. Measure piston protrusion at the two measuring points (arrows) (Fig. 38).
Piston protrusion with new crankcase should be 0.38 - 0.62 mm.