Unit Injector Adjustment - Volvo EPA2007 D13F Reference Manual

162 BASIC SERVICE

Unit Injector Adjustment

The unit injector adjustment is done with the engine and camshaft in the same position
as for the inlet valve adjustment on each cylinder.
W2033398
1. Loosen the injector rocker arm adjusting screw jam nut and turn the adjusting screw
out (counterclockwise) to relieve the preload.
2. Turn the adjusting screw in (clockwise) until it firmly contacts the injector. Do
not compress the spring.
3. Turn the adjusting screw in a further 240° (four flats on the hex head).
4. Hold the adjusting screw to prevent it from turning further and, using a torque
wrench, tighten the jam nut to specification.
5. Mark the respective rocker arm as each adjustment is completed.