Piston: Description and Operation

DESCRIPTION





CAUTION: If the connecting rod bolts are ever loosened, replace all of the connecting rods.

The pistons are made of a high strength aluminum alloy and have an oval shape to reduce friction and noise. The piston crown consists of a combustion bowl and four recesses machined for the valves. Circlips secure a full floating piston pin. The piston pin is offset 0.4 mm (0.016 in) toward the piston's major thrust surface to reduce slap. The pistons have a phosphated surface treatment and the piston skirts have a graphite treatment for scuff resistance. The piston skirts have notches to provide the necessary clearance for the oil jets when the pistons are at BDC.