- Four-stroke carburetor or diesel (turbocharged) transverse engine.
- Inline 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 timing belt (on the Jetta GL1 16V model - two camshafts).
- Self-adjusting hydraulic valve lifters.
- Liquid temperature controlled cooling system.
- Electric fan with thermal switch.
- Pressurized lubrication system with hex 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 the ignition timing or fuel injection in case of detonation combustion of the fuel). On a 134 hp engine. the ignition or fuel injection timing is adjusted automatically according to the anti-denotation characteristics of the fuel.
- Fuel injection system, fuel system with electric fuel pump (carbureted engine).
- Diesel fuel injection system with quick-acting glow plugs and pre-combustion chambers
- Long life V-belts with minimum maintenance requirements.
- Air cleaner with paper filter element.
For carbureted engines only:
- Exhaust gas control system with activated carbon filter in the fuel system.
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