FUEL SYSTEM
140
Injection Nozzle Needle Inspection
1. Remove the nozzle needle from the nozzle body.
2. Carefully wash the nozzle needle and the nozzle
body in clean diesel fuel.
3. Check that the nozzle needle moves smoothly inside
the injection nozzle body.
If the nozzle needle does not moves smoothly, it
must be repaired (See “Nozzle Lapping Procedure”
below.)
Nozzle Lapping Procedure
1. Lap the nozzle needle 1 and the nozzle body 2 by
applying a compound of oxidized chrome and
animal oil 3.
Note:
Do not apply an excessive amount of the oxidized
chrome and animal oil compound to the injection needle
valve seat area.
2. Carefully wash the needle valve and the nozzle body
in clean diesel fuel after lapping.
Nozzle Body and Needle Valve Inspection
Check the nozzle body and the needle valve for damage
and deformation.
The nozzle and body must be replaced if either of these
two conditions are discovered during inspection.
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is
discovered during inspection.
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