10 Reassemble the injection valve.
Tighten the cap nut to
the torque given in section 07.1.
11 Connect the injection valve
to the test pump. Pump to
expel air. Shut the manometer valve and pump rapidly to blow
dirt out of the nozzle orifices. Place a dry paper under the
nozzle and give the pump a quick blow. Note fuel spray uni-
formity.
12 Check the opening pressure:
·
open manometer valve,
·
pump slowly and watch manometer to note the opening
pressure.
If the opening pressure is more than 20 bar below the stated
value, with damped movement of the indicator, it indicates
a broken spring or badly worn parts.
13 The symmetry of the spray
can be evaluated when hav-
ing the opening pressure adjusted first to 50 - 100 bar. Needle
stroke using standard hand test pump is close to nominal with
low opening pressure. Unequal distribution can mean blocked
or worn spray holes.
14 Check the needle seat tightness:
·
increase pressure to a value 20 bar below the stated opening
pressure,
·
keep pressure constant for 10 seconds and check that no fuel
drops occur on the nozzle tip. A slight dampness may be
acceptable.
15 Check the needle guide tightness:
·
increase the pressure in test pump over 300 bar,
·
stop pumping and measure the pressure drop time from 250
to 200 bar. In a new nozzle the time varies between 3 - 6
seconds but is much depending on the test equipment. To
judge the wear correctly, you should note the pressure drop
time in a new nozzle and compare the results to later testing
results with same nozzle. If pressure drop time on a used
nozzle dropped to 1/3 of the original, the guiding is worn too
much and the nozzle has to be replaced.
16 If the tests according to step 11...15
give satisfactory
results the injection valve can be re-installed in the engine.
Otherwise, replace the nozzle by a new one.
17 If leakage occurs
on the high pressure sealing surfaces the
damaged detail should be replaced by a new one or reconditioned.
18 If nozzles or injection valves are to be stored
they
should be treated with corrosion protecting oil.
32-200627-01
Injection System
16
WÄRTSILÄ 32
16 - 15
Summary of Contents for PAAE051728
Page 4: ......
Page 18: ...Appendix B Welding Precautions 200640 00 6...
Page 26: ...01 Main Data Operating Data and General Design 32 200634 01 01 8 W RTSIL 32...
Page 60: ...Appendix A Environmental Hazards 200507 02A 10...
Page 68: ...Page 7 7 Document No 4V92A0645 Rev j...
Page 84: ...03 Start Stop and Operation 32 200402 04 03 12 W RTSIL 32...
Page 98: ...04 Maintenance Schedule 32 200623 01 04 14 W RTSIL 32...
Page 154: ...07 Tightening Torques and Use of Hydraulic Tools 32 200643 01 07 30 W RTSIL 32...
Page 162: ...08 Operating Troubles Emergency Operation 32 200402 01 08 8 W RTSIL 32...
Page 164: ...Specific Installation Data 2005 01 09 2...
Page 178: ...10 Engine Block with Bearings Oil Sump and Cylinder Liner 32 200150 10 14 W RTSIL 32 34SG...
Page 216: ...Appendix A Testing of cylinder tightness 32 200142 A 4 W rtsil 20 32 34...
Page 226: ...13 Camshaft Driving Gear 32 200546 02 13 10 W RTSIL 32...
Page 254: ...15 Turbocharging and Air Cooling 32 200549 10 15 20 W RTSIL 32...
Page 274: ...16 Injection System 32 200627 01 16 20 W RTSIL 32...
Page 280: ...Fuel System 32 200508 07 17 6 W RTSIL 32...
Page 314: ...19 Cooling Water System 32 200050 19 14 W RTSIL 32...
Page 394: ...23 Instrumentation and Automation 32 200115 II 23 60 W RTSIL 32...