Repair of the fuel system of diesel engines of cars Volkswagen Passat B4 1988-1996

Features of the engine power supply system «1Y», «RA», «SB», «AAZ»
Model engines «1Y», «RA», «SB» and «AAZ» have a power supply system with a mechanical drive. Engines «RA», «SB» and «AAZ» have a turbocharging system. The plastic fuel tank is...

Power system with mechanical drive motors «1Y», «RA», «SB», «AAZ»
The fuel supply system is shown in fig. 3-32. Details of the power supply system for different types of diesel engines are shown in fig. 3-33, 3-34 and 3-35. Pic. 3-32. Fuel...

Removal and installation of injection pump
To remove, disconnect the cable from the negative battery terminal. Remove the manhole cover at the top of the clutch housing. Rotate the crankshaft until the mark on the flywheel...

Fuel Injection Advance Adjustment
This adjustment requires an indicator with a scale of 5 mm, equipped with a stem with a length of at least 95 mm with a flat tip, as well as a stand for mounting the indicator...

Diesel idle adjustment
. This adjustment must be made with the engine warm (oil temperature not less than 60°C), with a correctly set fuel injection advance angle, with clean filter elements of the air...

Diesel Fast Idle Adjustment «AAZ»
Check for correct idle speed adjustment. Pull out the cold start handle to the first detent position. In this case, the speed should increase by 60 rpm. Pull the cold start handle...

Adjusting the maximum engine speed without load
Start and warm up the engine (oil temperature not less than 60°C). Briefly press the pedal to failure on the fuel supply and check the speed of the crankshaft, which should be in...

Residual fuel adjustment
The position of the residual fuel supply adjusting screw is set at the factory and should not be changed during operation. Misalignment of the screw may result in the following:...

Removal and installation of nozzles
To remove, disconnect the high pressure fuel lines from the injectors. Disconnect the fuel drain line. Unscrew the injectors with a socket or box wrench (pic. 3-42). Remove heat...

Dismantling and checking the technical condition of the injectors
The injector structure is shown in Figure 3-44. Pic. 3-44. Nozzle: 1 - fitting of the drain pipeline; 2 - sealing ring; 3 - body; 4 - atomizer nut; 5 - spray needle; 6 - atomizer;...

Checking the operation of the nozzle needle valve
1st technique When fuel is supplied under pressure from the injection pump to the injector, the injection pressure changes between the start of injection and the end of injection....

Checking and adjusting the injection start pressure of the injectors
Warning. When checking injection start pressure, take care to protect your hands from high pressure fuel jet, which can cause serious injury. Attach the injector to the tool with...

Draining sediment from the fuel filter
Remove check valve holders 1 (pic. 3-49) fuel filter. Remove the valves from the filter without disconnecting the fuel lines from the valve. Remove fuel filter from bracket....

Bleeding air from the fuel system
After each depressurization of the fuel system, it is necessary to remove air from it as follows: place a container under the fuel filter to collect fuel; unscrew the bleed screw...

Diesel preheating system
Engine preheating system (pic. 3-50) includes single-pole spark plugs connected in parallel, which are supplied with voltage from the battery through the spark plug. in position...

Diesel power system malfunctions
Note The reason for the incorrect fuel injection advance angle is most often its incorrect installation or loosening of the injection pump mounting bolts. The formation of...

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Diesel engine fuel system Volkswagen Passat B4