TM 5-3805-280-24-2
Fuel System Operation and Tests
DIAGNOSE ANEROID MALFUNCTIONS
115
77
Symptom
Problem
Solution
Slow Engine Acceleration
Loose pipe or broken connection at
Repair as required. (See Group 35.)
inlet fitting.
Aneroid cover cracked around inlet
Repair as required. (See Group 35.)
fitting.
Defective diaphragm.
Repair as required. (See Group 35)
Aneroid not correctly adjusted.
Remove injection pump (see Group
35) and adjust on test stand.
Excessive Smoke When
Aneroid not correctly adjusted
Remove injection pump (see Group
Accelerating Engine
35) and adjust on test stand.
Use information contained in the chart above to help diagnose aneroid malfunctions.
See Group 35 for instructions on how to repair and adjust the aneroid.
The aneroid controls fuel delivery when intake manifold pressure is about 100 kPa (1 bar) (15 psi) or less. Therefore,
all final adjustments are to be made on the test stand with aneroid mounted on injection pump.
IMPORTANT: Correct aneroid adjustments are essential for satisfactory engine performance. Whenever the
aneroid adjustments have been altered, the injection pump (including aneroid) must be
calibrated on the test stand by an authorized diesel injection repair station before releasing the
pump for service.
RG,115,JW7682 1924NOV971/1
13-604
