Cars produced before 6/92 were equipped with a 1.9 l TD engine, in which a torque of 150 Nm was provided at 2200 rpm. Since 7/92, an improved version of this engine has been installed, in which a torque of 150 Nm is provided at 2400 rpm.
With regard to the 1.9l TDI engine, since the end of 1993, an improved version has been installed on AUDI vehicles, with increased torque of 202 Nm at 1900 rpm. Before that, cars were equipped with the same engine, but its torque was 182 Nm at 2300 rpm. On cars with automatic transmission, an improved version of the Engine is installed from 7/93.
The cylinder block of diesel engines is made of gray cast iron. The crankshaft is located at the bottom of the cylinder block, and the cylinders are located at the top (four in a row). The cylinders are surrounded by coolant circulation channels.
The crankshaft of the engines has five main bearings. This means that each crankpin is supported on the right and left.
If you look in the direction of movement of the car, then for cars with a manual transmission, there is a flywheel on the rear end of the crankshaft, to which the clutch disc is pressed. Torque from the engine is transmitted by the gearbox. On vehicles with an automatic transmission, instead of a flywheel, a thin clutch disc is mounted on the crankshaft along with a torque converter.
At the opposite end of the crankshaft is a drive gear and a belt pulley with a vibration damper.
Light metal pistons have a steel thermostatic plate. TD engine pistons have an 8-shaped combustion chamber cavity. This cavity provides improved pressure distribution of the gases formed during the combustion of the air-fuel mixture (see illustration 3.0a).
3.0a Diesel cylinder head with swirl chamber
1 - Coolant circulation channels
2 - Exhaust valve
3 - Inlet valve
4 - Swirl chamber insert
5 - Hole of the channel connecting the vortex chamber with the over-piston space
6 - Glow plug
TDI engine pistons have an omega-shaped combustion chamber «ABOUT» (see illustration 3.0b).
3.0b TDI engine cylinder head
1 - Recess for exhaust valve (small diameter)
2 - Recess for intake valve (larger diameter)
3 and 4 - The cavity of the combustion chamber in the form of the letter omega «L»
The designation of the pistons 1/2 and 3/4 corresponds to the different types of pistons installed on the engine. For pistons of cylinders 1 and 2, the exhaust valve recesses are located in the direction of travel, while for pistons of cylinders 3 and 4, the recesses are on the rear side. The intake and exhaust valves are mirrored. At the same time, to ensure better heat distribution, exhaust valves having a shell of their hard metal (stellite) located closer to the ends of the engine.
3.0 TDI engine cutaway
1 - Power steering hydraulic pump
2 - Intermediate shaft drive gear
3 - Driving gear of injection pump
4 - Charge air cooler (intercooler)
5 - Toothed belt and tension roller
6 - Camshaft drive gear
7 - Damper roller
8 - Camshaft
9 - Crankcase ventilation pressure reducing valve
10 - valve nozzle
11 - Glow plug
12 - Valve (high school graduation)
13 - Vacuum brake booster pump
14 - Oil cooler
15 - Oil filter
16 - Oil pump
17 - Piston
18 - Crankshaft
3.0v TD engine cutaway
1 - Camshaft
2 - Poppet pushers
3 - Valve
4 - Piston
5 - Connecting rod
6 - Crankshaft
7 - Intermediate shaft
8 - Oil pump
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