TM 5-3805-280-24-2
Fuel System Operation and Tests
115
Symptom
Problem
Solution
81
Broken, worn or damaged parts:
Repair as required. (See Group 35.)
Broken nozzle valve spring
Cracked or split nozzle tip
Cracked or split nozzle body
Internal leak
Wrong nozzle assembly installed.
Install correct nozzle assembly. (See
Group 35.)
RG,115,JW7680 1924NOV972/2
TEST FUEL INJECTION NOZZLES (ENGINE
RUNNING)
1. Operate engine at intermediate speed with no load.
2. Slowly loosen the fuel pressure line at one of the
nozzles until fuel escapes at the connection (fuel not
opening nozzle valve).
If engine speed changes, the injection nozzle is
probably working satisfactory.
If engine speed does not change, a nozzle is faulty
and must be checked and repaired (or replaced).
NOTE: The injection nozzle before and/or after nozzle
being checked could be the faulty nozzle.
3. Repeat test for each remaining nozzle assembly.
4. Remove faulty injection nozzles and repair as required.
(See Group 35.)
5. Tighten fuel lines to specifications.
Fuel Injection Nozzle Delivery Lines--Specification
Torque ............................................................................. 27 Nm (20 lb-ft)
RG,115,JW7679 1924NOV971/1
13-608
