The ZS-T engine is in-line, 4-cylinder, 8-valve with an overhead camshaft. The working volume of the engine is 2.2 liters. Cylinder numbering is from the crankshaft pulley.
Engine running order: 1-3-4-2.
5-support crankshaft with 8 counterweights installed on the continuation of the crankshaft webs, designed to unload the main bearings from the action of centrifugal forces. Holes are made in the crankshaft for supplying oil to the main and connecting rod bearings and other elements.
The cylinder head is made of aluminum alloy.
Exhaust and intake valve springs are made of special carbon steel and have variable pitch to reduce resonance.
Camshafts
The camshaft is driven from the crankshaft by a toothed belt.
The camshafts have 5 bearing journals. Lubrication of the necks, cams and gears of the camshaft drive is carried out by oil, which enters through the oil channel located in the center of the shaft.
The clearance in the valve drive is adjusted by replacing the shims in the valve lifters. The shims can be replaced without removing the camshafts.
The pistons are made of aluminum alloy.
piston pins - "floating" type.
Compression rings: upper compression ring is made of stainless steel, lower compression ring is made of cast iron.
The oil scraper ring consists of two scrapers and an expander. The oil scraper ring removes excess oil from the cylinder walls, preventing it from entering the combustion chamber.
The cylinder block is cast iron. The upper part of the cylinder block is covered by the cylinder head, and the lower part of the block forms the engine crankcase, in which the crankshaft is installed. The cylinder block has a cooling jacket through which coolant circulates.
The oil pan is bolted to the cylinder block. The oil pan is stamped from steel sheet. The dividing wall inside the oil pan retains enough oil even when the vehicle is tilted. The baffle plate also prevents oil waves from being created when the vehicle is braked hard.