© Scania CV 2011
49
PDE31:
1.
First, measure the distance (
A)
between plane (
a)
and the top edge of the
valve spring collar 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 caliper 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.
8.
The order in which the injector rocker arms are to be checked/adjusted is
shown in the table below.
Note:
Additional checking and adjustment of the PDE injectors,
e.g. checking the opening pressure, must not be carried out.
Faulty injectors must always be replaced completely.
Order of adjustment:
- Turn the flywheel so that the marks on the flywheel can be seen in the
lower opening in the flywheel casing.
Mark on flywheel
Valve
transition on
cylinder
Adjust injector rocker
arm on cylinder
TDC Down (0°)
6
4 and 5
TDC Up (180°)
7
2 and 6
TDC Down (360°)
1
3 and 7
TDC Up (540°)
4
1 and 8
Piston above or below the flat
surface. Adjustment necessary
Piston level with the flat surface.
The adjustment is correct
66.9
99 414
