Inspection And Adjustment - Volvo Penta D65A MS Workshop Manual

Group 23 Fuel System
150
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Inspection and Adjustment

Injection pressure
1. Install the nozzle on the nozzle tester. Operate
the handle of the tester at a rate of about 1 stroke
per setond to observe the pressure at which fuel
is being injected. If the pressure is out of stan-
dard, adjust it.
Injection pressure, MPa (kgf/cm2) [psi]
Assembly Standard ... 34.32–34.81(350–355)[4979–5050]
WARNING! Never touch the spray hole of the in-
jection nozzle during injection testing.
2. To adjust injection pressure, remove the set
screw from the nozzle holder, loosen the cap nut,
and then turn the adjusting screw. To increase
the injection pressure, tighten the screw. To de-
crease the injection pressure, loosen the screw.
3. After completing the adjustment, tighten the set
screw and the cap nut to the specified torque.
4. Re-check the injection pressure to be sure that it
is correct.
Spray pattem
1. When you are testing the injection pressure, in-
spect each nozzle for clogged or leaking holes.
Also examine the spray pattem. If the nozzle is
faulty, wash or replace it.
2. When tested on the nozzle tester, the nozzle
should spray fuel from all ten holes at the same
time in a straight cone of 160 degrees. The spray
should tonsist of finely atomized fuel particles
without large droplets. The spray should termi-
nate without dripping at the top.