Disconnect the ground wire from the battery.
Attention: When the battery is disconnected, the information in the electronic memory devices is erased, for example, the memory of engine malfunctions or the memory of the radio security code. Disconnect the battery only when the ignition is off, so as not to damage the fuel injection system control unit. When disconnecting the battery, follow the instructions in sections "Radio" And "Removing and installing the battery".
Raise the front of the car.
Unscrew the engine compartment pan and fan frame.
Unscrew the central screw plug -1- of the high pressure fuel pump.
Screw in an adapter instead of a cork (BMW-135330) and dial indicator and tighten a little.
Rotate the crankshaft clockwise towards cylinder 1 top dead center until the indicator needle remains stationary at its lowest point. Start turning the crankshaft at least 60°-90°before top dead center. In this case, the piston of cylinder 1 is at top dead center if both cams corresponding to cylinder 1 on the chain side point upwards. For control, open the oil filler neck and observe the cams.
To crank the engine, engage 5th gear, release the handbrake and move the vehicle. Or pull up the handbrake, put the gearbox in neutral and turn the crankshaft belt pulley with the head of the wrench on the central bolt.
Reset the dial indicator scale.
Unscrew the plug on the motor block.
Turn the crankshaft clockwise until the blocking rod can be inserted (BMW-112300) through the hole in the engine block to the hole in the flywheel at top dead center.
Attention: Do not turn the engine counterclockwise. This leads to incorrect measurement results.
Model 3254td/tds: In this position, the dial indicator should read 0.95 + 0.02 mm.
Model 318tds: In this position, the dial indicator should read 0.60 + 0.02 mm.
If the measurement result differs from the specified one, adjust the high pressure fuel pump.
Loosen bolt -3- without unscrewing.
Loosen nuts -1- and -2-.
Attention: Loosen the nuts a little to avoid overtightening by the toothed belt.
Turn the high-pressure fuel pump until the set point indicator on the scale is set.
Tighten nuts and bolts in sequence 1 to 3 to 25 Nm.
Check the adjustment again. To do this, first turn the crankshaft back by 90°.
Remove dial gauge.
Screw in the central screw plug with a new copper sealing washer with a tightening torque of 15 Nm.
Start the engine and, if necessary, bleed the air from the fuel injection system.
After a test drive, check the tightness of the central plug screw and, if necessary, tighten it to a maximum of 20 Nm.