Adjustment Of Injection Timing - Volvo Penta D65A MS Workshop Manual

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Adjustment of Injection Timing

Adjustment of the prestroke
After the pump assembly is completed, place it on an
injection pump tester, and make the following adjust-
ments.
1. Remove the deflector bolt from the back side of
the pump case.
2. Remove the valve holder from cylinder No. 1
(counter-drive side), then remove the spring seat,
valve spring and delivery valve.
3. Set the measuring tip of a dial depth gaugeon the
head of the plunger. Rotate the camshaft by hand
to bring the plunger to the bottom dead center by
reading the indication on the depth gauge. Set
the depth gauge indicator to "0".
4. Tum the camshaft in the normal operating direc-
tion until the dial depth gauge indicates 5 mm [0.2
in.].
5. With the camshaft in this position, check to make
sure the pointer located on the pump case end
surface aligns with the stamped line on the fly-
wheel. If they are not aligned, stamp a new line
on the flywheel at the pointer position.
6. Point a flashlight from the top of the pump case,
and look through the deflector bolt hole and
check the position of the upper end of the
plunger.
7. Rotate the camshaft until the upper end of the
plunger closes the barrel suction hole. With the
camshaft in this position, the pointer should align
with the stamped line on the flywheel. If not,
change the shims so the pointer aligns with the
line.
NOTE! Increase of shim thickness retards injec-
tion timing and decrease of shim thickness ad-
vances injection timing.
IMPORTANT! Never use more than one shim on
each side. Use shims of the same thickness on
both sides of the cylinder.
Group 23 Fuel System
167