- Four-stroke carburetor or diesel (turbocharged) transverse engine.
- In-line four-cylinder engine.
- Crankshaft with five main bearings.
- Cylinder head made of light alloy (on the Jetta GL1 16V model - four valves per cylinder).
- Overhead camshaft with toothed drive belt (on the Jetta GL1 16V model there are two camshafts).
- Self-adjusting hydraulic valve lifters.
- Liquid temperature-controlled cooling system.
- Electric fan with thermal switch.
- Pressure lubrication system with gear-type oil pump and full-flow filter.
- Maintenance-free electronic ignition system with full electronic engine control (general control of the ignition system and fuel injection system).
- Ignition system with memory and knock sensor (quick setting of ignition timing or fuel injection in case of detonation combustion of fuel). On a 134 hp engine, the ignition timing or fuel injection angle is adjusted automatically in accordance with the anti-knock characteristics of the fuel.
- Fuel injection system, fuel system with electric fuel pump (carburetor engine).
- Diesel fuel injection system with fast acting glow plugs and pre-combustion chambers
- V-belts with long service life and minimal maintenance requirements.
- Air purifier with paper filter element.
For carburetor engines only:
- Exhaust gas control system with activated carbon filter in the fuel system.
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