54 © Scania CV 2009
PDE31:
1. Firstly, measure the distance (A) between plane (a) and the top edge of
the valve spring washer on the unit injector using a digital sliding
calliper. See figure.
2. Dimension (A) should be 66.9 mm for PDE31 (dimension B=36.5 mm).
3. The dimension is adjusted by undoing the lock nut and screwing the
rocker arm adjusting screw (1) to the correct measurement.
WARNING! Take care when carrying out the adjustment if the
dimension is well outside the adjustment dimension. The
spring is pre-tensioned and can cause personal injury if it is
released.
4. Position setting tool 99 414 with the metal plate around the injector
spring.
5. Finely adjust dimension (A ) by simultaneously using a finger to sense
that the small piston (2) is level with the flat upper surface of the tool. It
is possible to feel differences of less than a tenth of a millimetre.
6. If the setting tool is not available, a digital sliding calliper can also be
used for fine adjustment. The rocker position is adjusted using the
adjusting screw to 66.9 +/-0.1 mm as stated above.
7. Tighten the adjusting screw lock nut to 39 Nm and remove the tool.
Note: No further checking or adjustment of the unit injector, such as
checking the opening pressure, must be done. If an injector is
defective, the whole injector must be replaced.
Piston level with the flat surface.
Adjustment is correct.
Piston above or below the flat
surface. Adjustment necessary.
66.9
99 414
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