Lombardini 11 LD Series - How to Check Injection Pump Delivery Valve Sealing; How to Check Plunger and Barrel for Internal Leakage; Plunger

50
COMPILER TECO/ATL
REG. CODE
1-5302-296
MODEL N°
50510
DATE OF ISSUE
01.89
REVISION 02
ENDORSED
DATE
17.04.2003
121 122
124 125
123
X
Plunger
A = For injection pump type LOMBARDINI-OMAP mounted on
11 LD626-3
B = For injection pumps type Bosch and LOMBARDINI-OMAP
mounted on 11 LD535-3 and 11 LD625-3.
Dimensions (mm):
C = 1.000÷1.100
D = 7.445÷7.455
E = 7.500
F = 3.000÷3.025
G = 7.225÷7.275
H = 7.000
I = 3.000
L = 10.250
How to check plunger and barrel for internal leakage
This operation is only diagnostic since pressure changes depend
on the pumping speed.
Connect the delivery union with a 600 bar pressure gauge with safety
valve.
Adjust rack rod at half-stroke. Turn flywheeI according to its direction
so that the plunger puts the circuit under pressure.
Replace plunger if the displayed pressure is below 300 bar.
Repeat the same operation for the other plungers.
How to check injection pump delivery valve sealing
Components:
1 Valve
2 Seat
Adjust pump rack at half-stroke. Turn flywheeI according to its
direction of rotation so that the plunger puts the circuit under
pressure. During this operation the displayed pressure will gradually
reach a peak followed by a sudden drop which corresponds to valve
closing. Pressure drop should be 30÷50 bar. Replace the valve if
pressure drop is below this value. Repeat the same operation for the
other two pumps.
FUEL SYSTEM