93
The above diagrams show the angle setting (a
°
) in rela-
tion to the engine speed.
The upper diagrams refers to an engine run warm (min.
55
°
), with engine load (Q) less than 55%. They show
that, at low engine load, there is no readjustment from
idle up to 800 r/min, irrespective of load, between 1080
and 1290 r/min. At other speeds there is readjustment.
The lower diagrams refer to a cold engine (max 55
°
)
with engine load (Q) less than 55% resp. more than
55%.
They show that, at low engine load, there is readjust-
ment at all speeds. At high engine load there is read-
justment between 1080 and 1290 r/min, otherwise ad-
justment takes place.
DH10A, 345
DH10A, 360
Value a
5,5
°
7
°
Value b
10,5
°
12
°
Function
The injection timer alters the
a
-angle to suit operating
conditions, see diagram below. When there is no cur-
rent in the solenoid valve, the engine
a
-angle is the
same as the basic setting value (a). When operating
conditions are such that current reaches the solenoid
valve, it opens and the engine lube oil presses the inter-
nal torsion piston to compress the pressure return
spring until the piston is against the internal adjuster
sleeve. During this movement the piston turns so that
the
a
-angle increases 5
°
to maximum
a
(b).
The value of a and b can be seen from the following
table:
