MTU Detroit Diesel 183 Series Technical Publication page 309

Task Description
After cleaning, visually inspect used nozzles to confirm cleaning process has been successful.
With nozzle holder assemblies and nozzle elements:
− Examine orifice outlet edge for mechanical damage.
With nozzle elements:
− If damage or coarse areas are found on the needle seat of the nozzle needle, replace nozzle completely.
− Using a magnifying glass with lamp, inspect orifices on nozzle tip for any possible carbon deposits remaining or
for other blockages; replace nozzle elements as necessary.
20080/1 E 98-12
After visual inspection, carry out sliding test on all
nozzle elements (new and used).
In this way, a drop test checks the sliding action
between the nozzle needle and nozzle body. Parts must
be coated with test oil or diesel oil.
Drop test: When the nozzle needle, 1/3 of which has
been pulled out of the nozzle body, is
released, it must slide down onto the seat
under its own weight.
If this is not the case, replace nozzle
needle and nozzle body.
Replace cleaning fluid as necessary.
Group 07
Subgroup 6750
Page 5