Rod, Piston And Connecting: Description

Courtesy of CHRYSLER GROUP, LLC

The pistons are a lightweight design with ultra low tension piston rings for improved fuel economy:

• The pistons are made of a high strength aluminum alloy and the piston skirt (6) has a MolyT® coating.
• The top piston ring land has an anodized coating for improved wear performance.
• The piston is connected to the rod using a full floating pin (5) with a locking clip (4) on both sides.
• The connecting rod is powder-forged steel with a bolted cracked cap design. The connecting rod bolts are not reusable.
• Pistons are available in three diameters (A, B and C) with grade markings for each bore indicated on the side of the cylinder block.
• The upper compression ring (1) is a 1.2 mm steel ring with Physical Vapor Deposition (PVD) coating.
• The intermediate compression ring (2) is 1.2 mm micro napier design.
• Both compression rings have a dot or a mark on the piston ring. The marked side of the ring must face the top of the piston.
• The 2 mm three piece oil control ring (3) is very thin. Both the rail segments and the expander are nitride steel.