Injectors, Checking/Adjusting - Volvo Penta TD520GE Workshop Manual

Group 20

Injectors, checking/adjusting

(23712, 23713)
NOTE! You must observe the utmost cleanliness
when working on the injection system. Use only clean
test oil that meets ISO 4113 or clean diesel to test the
injector.
NOTE! Let an authorized workshop do the tests and
adjustments. The test requires equipment not sold by
AB Volvo Penta.
WARNING! Be very careful when working with
the fuel injector nozzle. The fuel pressure jet
can penetrate deep into the skin tissue and
cause blood poisoning.
1. Connect the injector to the nozzle tester.
2. Check the opening pressure.
For control value for the opening pressure, see
"Technical data".
NOTE! The opening pressure is different depending on
if the injector or spring is new or used.
3. Check the density after the injector has opened.
The pressure may, at the most, drop to 5 MPa
(725 psi) /5 sec.
By keeping the pressure constant, 2 MPa (290
psi) below opening pressure for 10 seconds, make
sure that no drips occur.
Set the opening pressure for the injector
4. Take off the cap nut and remove all parts.
5. Wash the details in an ultrasonic cleaner,
alternatively washing petrol or Vanolen.
6. Inspect the injector details, using an injector
microscope.
7. Dip the parts in oil before assembly.
Checks and adjustments
31