Weakening
The toothed belt mechanism has an automatic tensioning device.
Unscrew the timing belt cover, see p. 1.11.
Turn the crankshaft clockwise and check the condition of the timing belt.
Caution: The gearbox must be in the "neutral" position and the handbrake must be cocked. Turn the crankshaft with a socket wrench by the central bolt only clockwise.
(The original can be found on the website: MitsubishiMan)
Set the piston of cylinder 1 to the TDC position. To do this, turn the crankshaft so that the mark on the camshaft wheel coincides with the pointer.
Caution: Turn the belt pulley only clockwise, otherwise the tension will be set incorrectly. Do not turn the engine by the camshaft wheel, as this will overstrain the toothed belt.
Loosen the locking screw of the timing belt tensioner on the back side. You will need an extension for the spanner to do this.
Press the belt tensioner down with your hand to loosen the belt. In this position, tighten the clamping screw so that the tensioner is stationary.
Tension
Turn the crankshaft slightly counterclockwise, namely so that the camshaft wheel moves by ½ a tooth in the direction shown in the figure. This will compensate for the loose fit of the toothed belt to the tension roller.
Loosen the clamping screw of the toothed belt tensioner so that it can be screwed in 1/6-½ turn. This will cause the tension roller spring to exert pressure on the toothed belt.
Turn the crankshaft counterclockwise by 216 teeth of the camshaft wheel, as indicated by the arrow in the figure.
Tighten the timing belt tensioner clamping screw to 50 Nm.
Turn the crankshaft clockwise and set the piston of the first cylinder to TDC.
Tension control
Press the toothed belt between the camshaft wheel and the high-pressure fuel pump gear with your index finger. The belt deflection should be 4-5 mm, otherwise, repeat the adjustment.
Screw on the timing belt covers, see p. 1.11.
Install the V-belt, see p. 1.21.