Lombardini LDW 502, Service Manual

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service manual
mod. 051135
6
A
H
C
G
F
E
D
B
H
C
B
L
A
6.2.8 Check and overhaul of the fuel pump
Disassemble the oil pump before checking or
overhauling. See “Disassembling the oil pump”
for the correct procedure.
1 - Remove the plate (A).
2 - Remove the O-ring (B).
3 - Remove the sealing ring (C) from the flange
and clean the seat.
4 - Unscrew the oil (D) and extract the gasket
(E), the spring (F) and the valve (G).
5 - Disassemble the rotors (H).
6 - Blow compressed air into the valve seat to
clean it.
7 - Thoroughly clean all the components.
8 - Measure the length of the spring (F).
If the length of the spring is not between
27.50 and 27.75mm, replace it with an
original spare.
9 - Replace the valve (G), the spring (F), the
gasket (E) and the plug (D).
10 - Fill the sealing ring (C) with grease and
lubricate the rim with oil.
11 - Mount the new sealing ring (C) using a
special tool.
Important
Given the particular function played by this sealing
ring, it is important to use only original spares.
12 - Mount the rotors (H) with the referance notches facing
upwards so that they are visible.
13 - Using a thickness gauge, measure the clearance
between the rotor teeth.
If clearance is above the 0.25mm limit for wear,
replace the rotors with original spares.
14 - Check that the contact surfaces are perfectly clean,
intact and not deformed.
15 - Mount the new O-ring.
Important
The O-ring must always be replaced with an original
spare part whenever the pump is disassembled.
16 - Replace the plate (A) and put in the screws (L).
17 - Tighten the screws (L) to a torque of 10 Nm.
OVERHAULS AND TUNING