Opposed-Piston Liner (T-80UD)

The opposed-piston liner for the T-80UD is a precision-machined cylinder sleeve for the 6TD series two-stroke opposed-piston diesel engine. This engine powers the T-80UD main battle tank. Military vehicle maintenance depots, armored vehicle engineering workshops, and defense procurement logistics programs across Pakistan use these liners as replacement components during engine overhaul and scheduled maintenance cycles.

Opposed-piston liners use centrifugally cast or forged alloy steel. The internal bore surface undergoes plateau honing to specific surface roughness values. Bore diameter on the 6TD engine liner runs at 120mm. Liner length accommodates two opposing pistons traveling toward each other within the same bore. No conventional cylinder head is required. Additionally, the outer surface carries precision ground contact bands at upper and lower seating positions. Consequently, these maintain correct liner registration and gas seal integrity throughout the engine operating cycle.

The opposed-piston design places both combustion events within a single liner bore. As a result, thermal loading on the liner wall runs higher than in conventional four-stroke engine designs. Liner material uses chrome-molybdenum or nickel-chrome alloy steel grades. These withstand combined mechanical and thermal stress without distortion across the service interval. Furthermore, liner wall thickness runs between 6mm and 10mm. This balances structural integrity against the weight constraints of the compact 6TD engine package.

Liner replacement occurs during scheduled overhaul at defined engine hour intervals. Worn liners show increased blow-by, oil consumption, and compression loss. Moreover, replacement liners require honing to final bore dimension after installation. This achieves correct piston clearance within the specified tolerance range for the 6TD engine.

Tactical Supply Pakistan supplies T-80UD opposed-piston liners to Pakistan Army armored vehicle maintenance depots and defense engineering workshops requiring genuine replacement components for 6TD engine overhaul programs throughout Pakistan.