Pistons and cylinder liners form the combustion chamber and transfer gas pressure to the connecting rod and crankshaft, running against each other under conditions no other pair of engine components experiences. This group covers pistons, rings, cylinder liners and related components. CAT uses both one-piece and two-piece articulated pistons depending on platform, the two-piece design pairing a steel crown with an aluminium skirt on higher-output engines to handle greater cylinder pressures. Liners are generally wet type and sealed to the block with O-rings at the lower landing. Pistons and liners are supplied and replaced as matched sets, because fitting a new piston into a worn liner leaves an incorrect running clearance and shortens the life of both.
AMS Parts supplies a wide range of pistons & liners components for CAT engines used in power generation, marine, and industrial applications. Browse the full range below, or contact us for specific requirements.
Browse our range of Pistons & Liners parts below. Use the search bar above to find a specific part number, or request a quote.
It combines a steel crown with an aluminium skirt, allowing the crown to withstand higher cylinder pressure and temperature than a one-piece aluminium piston. CAT uses this design on higher-output engines.
Yes. They are supplied as matched sets and the running clearance depends on both. New rings and liner seals should be fitted at the same time.
Both point to ring and liner wear. Measuring the bore against CAT's published wear limits confirms whether replacement is due.
