Yanmar 4JH4E - Page 237

6. Fuel Injection equipment
217
(2) 4JH4E service data
Part code (Back No.) 729670-51450 (SH79)
Adjustment SPEC ENGINE SPEC SERVICE STD
Item
Fuel valve (Valve pressure) VBG (220) (170)
Nozzle type (ID mark) 159P185VAD1 DN-12SD12
Fuel injection pipe
mm
Ø1.6 x 400 Ø2 x 600
Injection
adjustment
Starting
Pump speed Ns
(min
-1
)
200 200
Average injection
volume Qs
(mm
3
/st)
50 55
Rated load
Pump speed No
(min
-1
)
1500 1500
Injection volume Qo
(mm
3
/st)
33.1 ± 0.75 57.5 ± 0.75
Variation % ± 3 ± 3
Torque rise
Pump speed N
T
(min
-1
)
--
Injection volume Q
T
(mm
3
/st)
--
Nonunifomity % - -
Hi-idle
Pump speed N
Hi
(min
-1
)
1660
+15
-10
1660
+15
-10
Injection volume Q
Hi
(mm
3
/st)
6 - 7 18 - 19
Idle
Pump speed Ni
(min
-1
)
400 400
Qi
(mm
3
/st)
9 - 10 7 - 8
Nonunifomity % ± 10 ± 20
Plunger stroke
(mm)
8.0
Plunger dia. (mm) Ø8
Suction volume of delivery valve
(mm
3
)
36
Pre-stroke (mm) 3.0
Top clearance
(mm)
0.5
Governor
spring
Spring constant
N/cm
(kgf/cm)
2.76 (0.281)
Free length
(mm)
41