VW Golf 4 and Bora - Diesel engines
Motors 1,9 TDI type AGR, ALH, AHF and ASV Motors 1,9 SDI typu AGP i AQM
The Volkswagen concern can be proud of its significant contribution to the development of diesel engines for passenger cars. Since the introduction of the TDI engine, diesel engines have become more powerful and fuel-efficient than ever before. Mounted on both the Golf, as in other VW and Skoda cars, Seat) engine 1,9 The TDI breaks records in terms of economy. Golf equipped with its 90-horsepower variant, cooperating with a five-speed one, mechanical gearbox only consumes on average 4,9 liters of diesel fuel per 100 km. The same average consumption is given for the 110 HP version of this engine. Engine 115 KM needs it 5,1 l na 100 km.
Despite such low fuel consumption, Golfs with these engines are by no means “beefy””. With a 90 HP engine and mechanical gearbox, the car accelerates to 100 km / h within 12,4 seconds and reaches its maximum speed 180 km/h (115-horsepower variant, respectively 10,3 s i 195 km/h). The high torque contributes to such good results 210 Nm (115 KM – 285 Nm) already achieved at 1900 rpm. Specifications of this very popular engine: two valves per cylinder, turbocharger with variable geometry of the turbine blades, charge air cooling, Bosch electronic distributor injection pump control and, of course, direct fuel injection (you will find more information on injection systems in diesel engines in the relevant article). The engines have an exhaust gas recirculation system, in order to reduce the emission of nitrogen oxides.
A powerful engine 90 KM has been under construction since October 1997 r. on AGR and ALH versions. AGR type engine achieves rated power at 4000 rpm, and type ALH – already at rotational speed 3750 obr min. The type AHF engine is an engine 1,9 TDI with the power 110 KM at 4150 rpm (since September 1999 designation changed to ASV – engines meeting the D3 exhaust gas standard). Already at 1900 rpm its torque is 235 Nm. All TDI engines work with an oxidation catalytic converter.
On four-cylinder engines 1,9 TDI for a year 2000 high pressure direct fuel injection is used, by means of unit injectors. The first such engine of a new generation (injection pressure 200 MPa) with excellent performance in terms of power, torque and fuel economy is four cylinder 1,9 TDI PDE, with power 85 kW (115 KM) at 4000 rpm.
Maximum torque 285 Nm is already achieved at 1900 rpm, and in the version with modernized electronic engine control, the maximum torque is even 310 Nm. This engine is mated to Golf and Bora models with Tiptronic six-speed or automatic five-speed automatic transmissions.
Among diesel engines, from October 1997 r. also available undercharged engine 1,9 SDI type AGP with direct fuel injection and power 50 kW (68 KM). It has a torque 133 Nm at 2200…2600 rpm. They are characteristic of him: two-stage valve for exhaust gas recirculation, electrically adjustable intake manifold throttle and adjustable injection pump. Since November 1998 This engine is AQM marked and meets the D exhaust gas purity standard 3.
On the TDI and SDI diesel engines, the marking is stamped on the hull, at the point of connection with the gearbox. It is also, along with the serial number, located on a sticker on the toothed belt cover and on the main nameplate.
Self-repair or a visit to the workshop?
The engines of Golf and Bora cars are very complex structures, where the hobby mechanic is not able to do much by himself. Engine repairs and adjustments are almost always a workshop for the workshop. Such work requires a lot of knowledge, experience and mostly special tools, instruments for measuring and regulating and other auxiliary materials.
For example, an improperly installed toothed belt can damage pistons and valves. Leave work related to the head leakage to the workshop, valves and replacement of bearings. If you are not absolutely sure, that you can handle the repair of internal engine assemblies, give it up. And so there is going to be a lot of work to do with the maintenance of the engine, which you can conduct yourself.