(1) Disassembly
•
Clamp the nozzle holder in a vise and remove the cap nut.
•
Loosen the adjust screw lock nut and remove the adjust screw then detach the spring and
push-rod
•
Clamp the nozzle holder body with the nozzle side up in a vise.
•
With a wrench remove the nozzle nut using care not to drop the nozzle. Remove the nozzle
carefully not to drop the needle valve.
•
Visual inspection
After washing, check the injection nozzles against the following:
(1) Needle valves
Check the valve seats, guide shafts and injection shaft for damage.
(2) Nozzle body
Check the valve seats for carbon deposit and damage. Also check the injection orifices
for uneven wear.
Replace both of the parts by using assembly even if either of the needle valve or the nozzle
body is found to be defective.
•
Sliding test
A sliding test should be made on the entire injection nozzle often visual inspection.
Hold the nozzle body vertically and pull the needle valve upward about 1/3 of its entire
length and release it and see if it lowers onto its seat by its own weight.
If lowering of the needle valve is not smooth, check for presence of foreign matter and
repeat the test. If the trouble persists, replace the entire nozzle assembly with a new one.
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