B3.9 and B5.9 Series Engines
Section 6 - Injectors and Fuel Lines - Group 06
Inspect for Reuse (006-026-007)
Inspect the injector. Inspect the o-ring for damage. Inspect
for burrs on the inlet to the injector. Check the nozzle holes
for any signs of damage such as hole erosion or hole
plugging. Also, check the nozzle color for signs of over-
heating. Overheating will cause the nozzle to turn a dark
yellow and tan or blue color, depending on the temperature
of the overheat.
Inspect for rough surfaces and erosion. The pressure shoul-
der will normally have a rough machined appearance.
Inspect the injector bore for old sealing washers.
matched unit with their compatible nozzle body.
Dip the needle valve in clean test oil, and insert the needle
valve all the way into the nozzle body.
Pull the needle valve one-third of the way out of the nozzle
body. With the needle valve in the vertical position, the
needle valve must slide all the way back into the nozzle
body under its own weight.
If the nozzle fails the slide test, clean and test the nozzle
NOTE: Any needle valve and nozzle body assembly that
does not pass this test must be replaced.
Verify that the injector sealing washer is the correct thick-
ness. The incorrect sealing washer can cause high-pressure
fuel leaks and/or performance problems due to incorrect
Shim thickness specification: 1.5 mm [0.06 in].