54
17-04-2003
01
15-01-2004
DATE
COMPILER TECO/ATI
REG. CODE
1-5302-584
MODEL N°
50871
DATE OF ISSUE
REVISION
ENDORSED
107
106
105
X
Injection pump components and disassembly
1 Delivery union
2 Filler
3 Spring
4 Gasket
5 Valve
6 Gasket
7 Spring retainer
8 Spring
9 Spring plate
10 Rack
11 Plunger
12 Pin
A = Fuel outlet union
B = Fuel intake union
C = Fastening
D = Barrel
E = RH helix
Demount in compliance with the numeric order.
Plate 9 is held firm by pins 12. Lever up by inserting a tool between
the plate and the body of the pump.
The volume shifted by delivery valve 5 is 15
mm
3
in the pump of RY
70-75 and 25 mm³ in the pump of RY 50 is 21 mm
3
in the pump of
RY 103-110
Injection pump, body, plunger and delivery valve
Components: Dimensions mm:
1 Delivery valve A = 5.50 (nominal diam.) RY 50-70-75
2 Barrel A = 7,00 (nominal diam.) RY 103-110
3 Plunger A = 6,00 (nominal diam.) RY 70-75 EPA
4
Right helix B = 2.00 / 2.03
5 Delay notch C = 1.50 /1.53
6 Pump body
7 Collar
Note: The injection pump installed in engines for small vehicles,
soundproof generating sets, EPA and RY 103-110 engines,
are characterised by the inclusion of a collar 1 which
contributes to noise-reduction.
Injection pump refitting
The plunger is fitted with helix E facing towards the outlet union A; if
it is mistakenly fitted with the helix facing the intake coupling B the
injection pump no longer operates (there is no danger of engine
runaway); complete refitting following fig. 107.
FUEL SYSTEM
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