ENGINE DIAGNOSTIC TEST PROCEDURES
Section 6
•
TEST INJECTION NOZZLES (Continued)
3.
Injection Nozzle Installation
a.
Thoroughly clean nozzle bore in cylinder head
before reinserting nozzle holder assembly. Pay
particular attention to seating surfaces, in order
that no small particles or carbon will cause
assembly to be cocked or permit blow-by of
combustion gases. Don’t use hard or sharp
tools for cleaning. A round piece of brass
properly shaped or a round steel bristle brush is
permitted if used with care. Nozzle bores on
6.9 Liter Diesel Engines should use Nozzle
Seat Cleaner (SE-4139).
b.
Install injection nozzle washer, seal and gasket
(where applicable) on injector assembly. Use
new mounting gasket every time injector nozzle
is removed.
NOTE: Make sure old nozzle gasket is not left in
bore.
c.
Install nozzle assembly carefully into its bore so
that nozzle tip does not strike against recess
wall. Tighten to specified torque.*
d.
Install clamp, mounting bolt and attach high
pressure tubing and leak-off lines, as required.
Tighten to specified torque.*
* Refer to appropriate service manual.
e.
Operate
engine
and
check
for
fuel
or
combustion gas leakage.
CGES-240-4
Printed in United States of America
Page 36
