Fav 900
Engine / Injection valves
Checking injection nozzles
E
Testing
Fav 900 chassis number 23/3001and up
05.02.2001
2712 000001
E
a
1/3
Capitel Docu-No.
Index
Date Version
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Checking injection nozzles
PM-Picturemodule
PM-Picturemodule
Text-module
1.Check opening pressure :
Connect pressure gauge , push hand lever down slowly until the nozzle ejects spray, vibrating slightly.
Read off Opening pressure on the pressure gauge.If necessary, insert new washer.
If the pressure is too low, use a thinner washer (7), for excessive pressure use a thicker one.
High operating hours cause a reduction in the tension of the spring(6).
Which in turn slightly reduces the injection pressure. When repairing nozzles, always set opening
pressure at the upper limit (+8bars).
Note:
Washers with 0,01mm (.0004") increments are available from 1,0 to 1,99 mm (.039" to .78").
Text-module
2. Check for leaks :
Operate the hand lever.
At 20 bar (290 PSI) below the specified opening pressure the nozzle must be free from droplets for 10
secs.
Text-module
3. Check jet :
With the pressure gauge switched off apply fast pumping movements: The nozzle should vibrate
audibly and/or have even spray pattern.
PMTAB_Picture
Checking injection nozzles
With injection nozzle tester (manual test
appliance) check nozzle for :
● - opening pressure (spray pressure)
● - leak tightness and
● - spray pattern.
Use clean test oil or diesel fuel.
Before testing, clean nozzle and check for wear.
PMTAB_Picture
1 = Seal
2 = Nozzle tensioning nut
3 = Injection nozzle
4 = Intermediate washer
5 = Pressure pin
6 = Compression spring
7 = Compensating washer
8 = Circlip
Check nozzle and its holder
Fit nozzle inlet connection to pressure line of test
applicance
Warning:
The high injection pressure may cause severe injury.
Never touch the spray pattern!
Wear safety goggles!
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