MTU Detroit Diesel 183 Series Technical Publication page 304

Group 07
Subgroup 6712
Page 4
20080/1 E 98-12
Visual inspection of possibly obstructed nozzle
openings.
Switch off pressure gauge of test device.
Push pump lever down as fast as possible, at least
twice per second.
A Spray Pattern Check
Spray jets must correspond to number of openings.
B Visual Inspection of Nozzle Openings.
If a defect is found during inspection A (a jet is missing
or looks different to the others), the openings are to be
inspected with a lamp for obstructions.
Note:
Combustion deposits around the nozzle openings
strongly influence the spray pattern.
Judgement of the spray jet is only possible with the
above described rapid pump movement.
Other test methods are not permitted.
Replace defective injection nozzles.
Task Description